+++ /dev/null
-/*
- * moves.c - Move generation and checking
- *
- * Copyright 1991 by Digital Equipment Corporation, Maynard,
- * Massachusetts.
- *
- * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
- * 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Free
- * Software Foundation, Inc.
- *
- * Enhancements Copyright 2005 Alessandro Scotti
- *
- * The following terms apply to Digital Equipment Corporation's copyright
- * interest in XBoard:
- * ------------------------------------------------------------------------
- * All Rights Reserved
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appear in all copies and that
- * both that copyright notice and this permission notice appear in
- * supporting documentation, and that the name of Digital not be
- * used in advertising or publicity pertaining to distribution of the
- * software without specific, written prior permission.
- *
- * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
- * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
- * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
- * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
- * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- * ------------------------------------------------------------------------
- *
- * The following terms apply to the enhanced version of XBoard
- * distributed by the Free Software Foundation:
- * ------------------------------------------------------------------------
- *
- * GNU XBoard is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or (at
- * your option) any later version.
- *
- * GNU XBoard is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see http://www.gnu.org/licenses/. *
- *
- *------------------------------------------------------------------------
- ** See the file ChangeLog for a revision history. */
-
-#include "config.h"
-
-#include <stdio.h>
-#include <ctype.h>
-#include <stdlib.h>
-#if HAVE_STRING_H
-# include <string.h>
-#else /* not HAVE_STRING_H */
-# include <strings.h>
-#endif /* not HAVE_STRING_H */
-#include "common.h"
-#include "backend.h"
-#include "moves.h"
-#include "parser.h"
-
-int WhitePiece P((ChessSquare));
-int BlackPiece P((ChessSquare));
-int SameColor P((ChessSquare, ChessSquare));
-int PosFlags(int index);
-
-int quickFlag;
-char *pieceDesc[EmptySquare];
-char *defaultDesc[EmptySquare] = {
- "fmWfceFifmnD", "N", "B", "R", "Q",
- "F", "A", "BN", "RN", "W", "K",
- "mRcpR", "N0", "BW", "RF", "gQ",
- "", "", "QN", "", "N", "",
- "", "", "", "", "",
- "", "", "", "", "", "",
- "", "", "", "", "",
- "", "", "", "", "", "K"
-};
-
-int
-WhitePiece (ChessSquare piece)
-{
- return (int) piece >= (int) WhitePawn && (int) piece < (int) BlackPawn;
-}
-
-int
-BlackPiece (ChessSquare piece)
-{
- return (int) piece >= (int) BlackPawn && (int) piece < (int) EmptySquare;
-}
-
-#if 0
-int
-SameColor (ChessSquare piece1, ChessSquare piece2)
-{
- return ((int) piece1 >= (int) WhitePawn && /* [HGM] can be > King ! */
- (int) piece1 < (int) BlackPawn &&
- (int) piece2 >= (int) WhitePawn &&
- (int) piece2 < (int) BlackPawn)
- || ((int) piece1 >= (int) BlackPawn &&
- (int) piece1 < (int) EmptySquare &&
- (int) piece2 >= (int) BlackPawn &&
- (int) piece2 < (int) EmptySquare);
-}
-#else
-#define SameColor(piece1, piece2) (piece1 < EmptySquare && piece2 < EmptySquare && (piece1 < BlackPawn) == (piece2 < BlackPawn) || piece1 == DarkSquare || piece2 == DarkSquare)
-#endif
-
-unsigned char pieceToChar[EmptySquare+1] = {
- 'P', 'N', 'B', 'R', 'Q', 'F', 'E', 'A', 'C', 'W', 'M',
- 'O', 'H', 'I', 'J', 'G', 'D', 'V', 'L', 'S', 'U', 'K',
- 'p', 'n', 'b', 'r', 'q', 'f', 'e', 'a', 'c', 'w', 'm',
- 'o', 'h', 'i', 'j', 'g', 'd', 'v', 'l', 's', 'u', 'k',
- 'x' };
-unsigned char pieceNickName[EmptySquare];
-int promoPartner[EmptySquare];
-
-char
-PieceToChar (ChessSquare p)
-{
- int c;
- if((int)p < 0 || (int)p >= (int)EmptySquare) return('?'); /* [HGM] for safety */
- c = pieceToChar[(int) p];
- if(c & 128) c = c & 63 | 64;
- return c;
-}
-
-char
-PieceSuffix (ChessSquare p)
-{
- int c;
- if((int)p < 0 || (int)p >= (int)EmptySquare) return 0; /* [HGM] for safety */
- c = pieceToChar[(int) p];
- if(c < 128) return 0;
- return SUFFIXES[c - 128 >> 6];
-}
-
-int
-PieceToNumber (ChessSquare p) /* [HGM] holdings: count piece type, ignoring non-participating piece types */
-{
- int i=0;
- ChessSquare start = (int)p >= (int)BlackPawn ? BlackPawn : WhitePawn;
-
- while(start++ != p) if(pieceToChar[start-1] != '.' && pieceToChar[start-1] != '+') i++;
- return i;
-}
-
-ChessSquare
-CharToPiece (int c)
-{
- int i;
- if(c == '.') return EmptySquare;
- for(i=0; i< (int) EmptySquare; i++)
- if(pieceNickName[i] == c) return (ChessSquare) i;
- for(i=0; i< (int) EmptySquare; i++)
- if(pieceToChar[i] == c) return (ChessSquare) i;
- return EmptySquare;
-}
-
-void
-CopyBoard (Board to, Board from)
-{
- int i, j;
-
- for (i = 0; i < BOARD_HEIGHT; i++)
- for (j = 0; j < BOARD_WIDTH; j++)
- to[i][j] = from[i][j];
- for (j = 0; j < BOARD_FILES; j++) // [HGM] gamestate: copy castling rights and ep status
- to[VIRGIN][j] = from[VIRGIN][j],
- to[CASTLING][j] = from[CASTLING][j];
- to[HOLDINGS_SET] = 0; // flag used in ICS play
-}
-
-int
-CompareBoards (Board board1, Board board2)
-{
- int i, j;
-
- for (i = 0; i < BOARD_HEIGHT; i++)
- for (j = 0; j < BOARD_WIDTH; j++) {
- if (board1[i][j] != board2[i][j])
- return FALSE;
- }
- return TRUE;
-}
-
-char defaultName[] = "PNBRQ......................................K" // white
- "pnbrq......................................k"; // black
-char shogiName[] = "PNBRLS...G.++++++..........................K" // white
- "pnbrls...g.++++++..........................k"; // black
-char xqName[] = "PH.R.AE..K.C................................" // white
- "ph.r.ae..k.c................................"; // black
-
-char *
-CollectPieceDescriptors ()
-{ // make a line of piece descriptions for use in the PGN Piece tag:
- // dump all engine defined pieces, and pieces with non-standard names,
- // but suppress black pieces that are the same as their white counterpart
- ChessSquare p;
- static char buf[MSG_SIZ], s[2];
- char *m, *pieceName = defaultName;
- int len, c, d;
- *buf = NULLCHAR;
- if(!pieceDefs) return "";
- if(gameInfo.variant == VariantChu) return ""; // for now don't do this for Chu Shogi
- if(gameInfo.variant == VariantShogi) pieceName = shogiName;
- if(gameInfo.variant == VariantXiangqi) pieceName = xqName;
- for(p=WhitePawn; p<EmptySquare; p++) {
- if((c = pieceToChar[p]) == '.' || c == '~') continue; // does not participate
- m = pieceDesc[p]; d = (c == '+' ? pieceToChar[DEMOTED(p)] : c);
- if(p >= BlackPawn && pieceToChar[BLACK_TO_WHITE p] == (c & ~32)
- && (c != '+' || pieceToChar[DEMOTED(BLACK_TO_WHITE p)] == d)) {// black member of normal pair
- char *wm = pieceDesc[BLACK_TO_WHITE p];
- if(!m && !wm || m && wm && !strcmp(wm, m)) continue; // moves as a white piece
- } else // white or unpaired black
- if((p < BlackPawn || CharToPiece(d & ~32) != EmptySquare) && // white or lone black
- !pieceDesc[p] /*&& pieceName[p] == c*/) continue; // orthodox piece known by its usual name
-// TODO: listing pieces because of unusual name can only be done if we have accurate Betza of all defaults
- if(!m) m = defaultDesc[p];
- if(!m) continue;
- len = strlen(buf);
- *s = (d > 128 ? SUFFIXES[d-128>>6] : 0); d = 64 + (d & 63);
- snprintf(buf+len, MSG_SIZ-len, "%s%s%c%s:%s", len ? ";" : "", c == '+' ? "+" : "", d, s, m);
- }
- return buf;
-}
-
-int
-LoadPieceDesc (char *s)
-{
- ChessSquare piece;
- static char suf[] = SUFFIXES;
- char *r, *p, *q = s;
- int ok = TRUE, promoted, c;
- while(q && *s) {
- p = s;
- q = strchr(s, ';');
- if(q) *q = 0, s = q+1;
- if(*p == '+') promoted = 1, p++; else promoted = 0;
- c = *p++;
- if(!c) { ok = FALSE; continue; } // bad syntax
- if(*p && (r = strchr(suf, *p))) c += 64*(r - suf + 1), p++;
- if(*p++ != ':') { ok = FALSE; continue; } // bad syntax
- if(!strcmp(p, "(null)")) continue; // handle bug in writing of XBoard 4.8.0
- piece = CharToPiece(c);
- if(piece >= EmptySquare) { ok = FALSE; continue; } // non-existent piece
- if(promoted) {
- piece = promoPartner[piece];
- if(pieceToChar[piece] != '+') { ok = FALSE; continue; } // promoted form does not exist
- }
- ASSIGN(pieceDesc[piece], p);
- if(piece < BlackPawn && (pieceToChar[WHITE_TO_BLACK piece] == pieceToChar[piece] + 32 || promoted)) {
- ASSIGN(pieceDesc[WHITE_TO_BLACK piece], p);
- }
- pieceDefs = TRUE;
- if(q) *q = ';';
- }
- return ok;
-}
-
-// [HGM] gen: configurable move generation from Betza notation sent by engine.
-// Some notes about two-leg moves: GenPseudoLegal() works in two modes, depending on whether a 'kill-
-// square has been set: without one is generates all moves, and a global int legNr flags in bits 0 and 1
-// if the move has 1 or 2 legs. Only the marking of squares makes use of this info, by only marking
-// target squares of leg 1 (rejecting null move). A dummy move with MoveType 'FirstLeg' to the relay square
-// is generated, so a cyan marker can be put there, and other functions can ignore such a move. When the
-// user selects this square, it becomes the kill-square. Once a kill-square is set, only 2-leg moves are
-// generated that use that square as relay, plus 1-leg moves, so the 1-leg move that goes to the kill-square
-// can be marked during 2nd-leg entry to terminate the move there. For judging the pseudo-legality of the
-// 2nd leg, the from-square has to be considered empty, although the moving piece is still on it.
-
-Boolean pieceDefs;
-
-// alphabet "abcdefghijklmnopqrstuvwxyz"
-char symmetry[] = "FBNW.FFW.NKN.NW.QR....W..N";
-char xStep[] = "2110.130.102.10.00....0..2";
-char yStep[] = "2132.133.313.20.11....1..3";
-char dirType[] = "01000104000200000260050000";
-char upgrade[] = "AFCD.BGH.JQL.NO.KW....R..Z";
-char rotate[] = "DRCA.WHG.JKL.NO.QB....F..Z";
-
-// alphabet "a b c d e f g h i j k l m n o p q r s t u v w x y z "
-int dirs1[] = { 0,0x3C,0,0,0,0xC3,0,0, 0,0,0,0xF0,0,0,0,0,0,0x0F,0 ,0,0,0 ,0,0,0,0 };
-int dirs2[] = { 0,0x18,0,0,0,0x81,0,0xFF,0,0,0,0x60,0,0,0,0,0,0x06,0x66,0,0,0x99,0,0,0,0 };
-int dirs3[] = { 0,0x38,0,0,0,0x83,0,0xFF,0,0,0,0xE0,0,0,0,0,0,0x0E,0xEE,0,0,0xBB,0,0,0,0 };
-int dirs4[] = { 0,0x10,0,0,0,0x01,0,0xFF,0,0,0,0x40,0,0,0,0,0,0x04,0x44,0,0,0x11,0,0,0,0 };
-
-int rot[][4] = { // rotation matrices for each direction
- { 1, 0, 0, 1 },
- { 0, 1, 1, 0 },
- { 0, 1,-1, 0 },
- { 1, 0, 0,-1 },
- {-1, 0, 0,-1 },
- { 0,-1,-1, 0 },
- { 0,-1, 1, 0 },
- {-1, 0, 0, 1 }
-};
-
-void
-OK (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR cl)
-{
- (*(int*)cl)++;
-}
-
-void
-MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle, int range, char *desc, MoveCallback cb, VOIDSTAR cl)
-{
- char buf[80], *p = desc, *atom = NULL;
- int mine, his, dir, bit, occup, i, ep, promoRank = -1;
- ChessMove promo= NormalMove; ChessSquare pc = board[r][f];
- if(pc == DarkSquare) return; // this is not a piece, but a 'hole' in the board
- if(flags & F_WHITE_ON_MOVE) his = 2, mine = 1; else his = 1, mine = 2;
- if(pc == WhitePawn || pc == WhiteLance) promo = WhitePromotion, promoRank = BOARD_HEIGHT-1; else
- if(pc == BlackPawn || pc == BlackLance) promo = BlackPromotion, promoRank = 0;
- while(*p) { // more moves to go
- int expo = -1, dx, dy, x, y, mode, dirSet, ds2=0, retry=0, initial=0, jump=1, skip = 0, all = 0;
- char *cont = NULL;
- while(*p == 'i') initial++, desc = ++p;
- while(islower(*p)) p++; // skip prefixes
- if(!isupper(*p)) return; // syntax error: no atom
- dx = xStep[*p-'A'] - '0';// step vector of atom
- dy = yStep[*p-'A'] - '0';
- dirSet = 0; // build direction set based on atom symmetry
- switch(symmetry[*p-'A']) {
- case 'B': expo = 0; // bishop, slide
- case 'F': all = 0xAA; // diagonal atom (degenerate 4-fold)
- if(tx >= 0) goto king; // continuation legs specified in K/Q system!
- while(islower(*desc) && (i = dirType[*desc-'a']) != '0') {
- int b = dirs1[*desc-'a']; // use wide version
- if( islower(desc[1]) &&
- ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim)
- b = dirs1[*desc-'a'] & dirs1[desc[1]-'a']; // intersect wide & perp wide
- desc += 2;
- } else desc++;
- dirSet |= b;
- }
- dirSet &= 0xAA; if(!dirSet) dirSet = 0xAA;
- break;
- case 'R': expo = 0; // rook, slide
- case 'W': all = 0x55; // orthogonal atom (non-deg 4-fold)
- if(tx >= 0) goto king; // continuation legs specified in K/Q system!
- while(islower(*desc) && (dirType[*desc-'a'] & ~4) != '0') dirSet |= dirs2[*desc++-'a'];
- dirSet &= 0x55; if(!dirSet) dirSet = 0x55;
- dirSet = (dirSet << angle | dirSet >> 8-angle) & 255; // re-orient direction system
- break;
- case 'N': all = 0xFF; // oblique atom (degenerate 8-fold)
- if(tx >= 0) goto king; // continuation legs specified in K/Q system!
- if(*desc == 'h') { // chiral direction sets 'hr' and 'hl'
- dirSet = (desc[1] == 'r' ? 0x55 : 0xAA); desc += 2;
- } else
- while(islower(*desc) && (i = dirType[*desc-'a']) != '0') {
- int b = dirs2[*desc-'a']; // when alone, use narrow version
- if(desc[1] == 'h') b = dirs1[*desc-'a'], desc += 2; // dirs1 is wide version
- else if(*desc == desc[1] || islower(desc[1]) && i < '4'
- && ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim or same)
- b = dirs1[*desc-'a'] & dirs2[desc[1]-'a']; // intersect wide & perp narrow
- desc += 2;
- } else desc++;
- dirSet |= b;
- }
- if(!dirSet) dirSet = 0xFF;
- break;
- case 'Q': expo = 0; // queen, slide
- case 'K': all = 0xFF; // non-deg (pseudo) 8-fold
- king:
- while(islower(*desc) && (i = dirType[*desc-'a']) != '0') {
- int b = dirs4[*desc-'a']; // when alone, use narrow version
- if(desc[1] == *desc) desc++; // doubling forces alone
- else if(islower(desc[1]) && i < '4'
- && ((i | dirType[desc[1]-'a']) & 3) == 3) { // combinable (perpendicular dim or same)
- b = dirs3[*desc-'a'] & dirs3[desc[1]-'a']; // intersect wide & perp wide
- desc += 2;
- } else desc++;
- dirSet |= b;
- }
- if(!dirSet) dirSet = (tx < 0 ? 0xFF // default is all directions, but in continuation leg
- : all == 0xFF ? 0xEF : 0x45); // omits backward, and for 4-fold atoms also diags
- dirSet = (dirSet << angle | dirSet >> 8-angle) & 255; // re-orient direction system
- ds2 = dirSet & 0xAA; // extract diagonal directions
- if(dirSet &= 0x55) // start with orthogonal moves, if present
- retry = 1, dx = 0; // and schedule the diagonal moves for later
- else dx = dy, dirSet = ds2; // if no orthogonal directions, do diagonal immediately
- break; // should not have direction indicators
- default: return; // syntax error: invalid atom
- }
- if(mine == 2 && tx < 0) dirSet = dirSet >> 4 | dirSet << 4 & 255; // invert black moves
- mode = 0; // build mode mask
- if(*desc == 'm') mode |= 4, desc++; // move to empty
- if(*desc == 'c') mode |= his, desc++; // capture foe
- if(*desc == 'd') mode |= mine, desc++; // destroy (capture friend)
- if(*desc == 'e') mode |= 8, desc++; // e.p. capture last mover
- if(*desc == 't') mode |= 16, desc++; // exclude enemies as hop platform ('test')
- if(*desc == 'p') mode |= 32, desc++; // hop over occupied
- if(*desc == 'g') mode |= 64, desc++; // hop and toggle range
- if(*desc == 'o') mode |= 128, desc++; // wrap around cylinder board
- if(*desc == 'y') mode |= 512, desc++; // toggle range on empty square
- if(*desc == 'n') jump = 0, desc++; // non-jumping
- while(*desc == 'j') jump++, desc++; // must jump (on B,R,Q: skip first square)
- if(*desc == 'a') cont = ++desc; // move again after doing what preceded it
- if(isdigit(*++p)) expo = atoi(p++); // read exponent
- if(expo > 9) p++; // allow double-digit
- desc = p; // this is start of next move
- if(initial == 2) { if(board[r][f] != initialPosition[r-2*his+3][f]) continue; initial = 0; } else
- if(initial && !range) {
- if( (board[r][f] != initialPosition[r][f] ||
- r == 0 && board[TOUCHED_W] & 1<<f ||
- r == BOARD_HEIGHT-1 && board[TOUCHED_B] & 1<<f )) continue;
- initial = 0;
- }
- if(expo > 0 && dx == 0 && dy == 0) { // castling indicated by O + number
- mode |= 1024; dy = 1;
- }
- if(expo < 0) expo = 1; // use 1 for default
- if(!cont) {
- if(!(mode & 15)) mode |= his + 4; // no mode spec, use default = mc
- } else {
- strncpy(buf, cont, 80); cont = buf; // copy next leg(s), so we can modify
- atom = buf; while(islower(*atom)) atom++; // skip to atom
- if(mode & 32) mode ^= 256 + 32; // in non-final legs 'p' means 'pass through'
- if(mode & 64 + 512) {
- mode |= 256; // and 'g' too, but converts leaper <-> slider
- if(mode & 512) mode ^= 0x304; // and 'y' is m-like 'g'
- *atom = upgrade[*atom-'A']; // replace atom, BRQ <-> FWK
- atom[1] = atom[2] = '\0'; // make sure any old range is stripped off
- if(expo == 1) atom[1] = '0'; // turn other leapers into riders
- }
- if(!(mode & 0x30F)) mode |= 4; // and default of this leg = m
- }
- if(dy == 1) skip = jump - 1, jump = 1; // on W & F atoms 'j' = skip first square
- do {
- for(dir=0, bit=1; dir<8; dir++, bit += bit) { // loop over directions
- int i = expo, j = skip, hop = mode, vx, vy, loop = 0;
- if(!(bit & dirSet)) continue; // does not move in this direction
- if(dy != 1 || mode & 1024) j = 0; //
- vx = dx*rot[dir][0] + dy*rot[dir][1]; // rotate step vector
- vy = dx*rot[dir][2] + dy*rot[dir][3];
- if(tx < 0) x = f, y = r; // start square
- else x = tx, y = ty; // from previous to-square if continuation
- do { // traverse ray
- x += vx; y += vy; // step to next square
- if(y < 0 || y >= BOARD_HEIGHT) break; // vertically off-board: always done
- if(x < BOARD_LEFT) { if(mode & 128) x += BOARD_RGHT - BOARD_LEFT, loop++; else break; }
- if(x >= BOARD_RGHT) { if(mode & 128) x -= BOARD_RGHT - BOARD_LEFT, loop++; else break; }
- if(j) { j--; continue; } // skip irrespective of occupation
- if(board[y][x] == DarkSquare) break; // black squares are supposed to be off board
- if(!jump && board[y - vy + vy/2][x - vx + vx/2] != EmptySquare) break; // blocked
- if(jump > 1 && board[y - vy + vy/2][x - vx + vx/2] == EmptySquare) break; // no hop
- if(x == f && y == r && !loop) occup = 4; else // start square counts as empty (if not around cylinder!)
- if(board[y][x] < BlackPawn) occup = 0x101; else
- if(board[y][x] < EmptySquare) occup = 0x102; else
- occup = 4;
- if(initial && expo - i + 1 != range) { if(occup == 4) continue; else break; }
- if(cont) { // non-final leg
- if(mode&16 && his&occup) occup &= 3;// suppress hopping foe in t-mode
- if(occup & mode) { // valid intermediate square, do continuation
- char origAtom = *atom;
- int rg = (expo != 1 ? expo - i + 1 : range); // pass length of last *slider* leg
- if(!(bit & all)) *atom = rotate[*atom - 'A']; // orth-diag interconversion to make direction valid
- if(occup & mode & 0x104) // no side effects, merge legs to one move
- MovesFromString(board, flags, f, r, x, y, dir, rg, cont, cb, cl);
- if(occup & mode & 3 && (killX < 0 || kill2X < 0 && (legNr > 1 || killX == x && killY == y) ||
- (legNr == 1 ? kill2X == x && kill2Y == y : killX == x && killY == y))) { // destructive first leg
- int cnt = 0;
- legNr <<= 1;
- MovesFromString(board, flags, f, r, x, y, dir, rg, cont, &OK, &cnt); // count possible continuations
- legNr >>= 1;
- if(cnt) { // and if there are
- if(legNr & 1 ? killX < 0 : kill2X < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); // then generate their first leg
- legNr <<= 1;
- MovesFromString(board, flags, f, r, x, y, dir, rg, cont, cb, cl);
- legNr >>= 1;
- }
- }
- *atom = origAtom; // undo any interconversion
- }
- if(occup != 4) break; // occupied squares always terminate the leg
- continue;
- }
- if(hop & 32+64) { if(occup != 4) { if(hop & 64 && i != 1) i = 2; hop &= 31; } continue; } // hopper
- ep = board[EP_RANK];
- if(mode & 8 && occup == 4 && board[EP_FILE] == x && (y == (ep & 127) || y - vy == ep - 128)) { // to e.p. square (or 2nd e.p. square)
- cb(board, flags, mine == 1 ? WhiteCapturesEnPassant : BlackCapturesEnPassant, r, f, y, x, cl);
- }
- if(mode & 1024) { // castling
- i = 2; // kludge to elongate move indefinitely
- if(occup == 4) continue; // skip empty squares
- if((x == BOARD_LEFT + skip || x > BOARD_LEFT + skip && vx < 0 && board[y][x-1-skip] == DarkSquare)
- && board[y][x] == initialPosition[y][x]) { // reached initial corner piece
- if(pc != WhiteKing && pc != BlackKing || expo == 1) { // non-royal castling (to be entered as two-leg move via 'Rook')
- if(killX < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); if(killX < f)
- legNr <<= 1, cb(board, flags, NormalMove, r, f, y, f - expo, cl), legNr >>= 1;
- } else
- cb(board, flags, mine == 1 ? WhiteQueenSideCastle : BlackQueenSideCastle, r, f, y, f - expo, cl);
- }
- if((x == BOARD_RGHT-1-skip || x < BOARD_RGHT-1-skip && vx > 0 && board[y][x+1+skip] == DarkSquare)
- && board[y][x] == initialPosition[y][x]) {
- if(pc != WhiteKing && pc != BlackKing || expo == 1) {
- if(killX < 0) cb(board, flags, FirstLeg, r, f, y, x, cl); if(killX > f)
- legNr <<= 1, cb(board, flags, NormalMove, r, f, y, f + expo, cl), legNr >>= 1;
- } else
- cb(board, flags, mine == 1 ? WhiteKingSideCastle : BlackKingSideCastle, r, f, y, f + expo, cl);
- }
- break;
- }
- if(mode & 16 && (board[y][x] == WhiteKing || board[y][x] == BlackKing)) break; // tame piece, cannot capture royal
- if(occup & mode) cb(board, flags, y == promoRank ? promo : NormalMove, r, f, y, x, cl); // allowed, generate
- if(occup != 4) break; // not valid transit square
- } while(--i);
- }
- dx = dy; dirSet = ds2; // prepare for diagonal moves of K,Q
- } while(retry-- && ds2); // and start doing them
- if(tx >= 0) break; // don't do other atoms in continuation legs
- }
-} // next atom
-
-// [HGM] move generation now based on hierarchy of subroutines for rays and combinations of rays
-
-void
-SlideForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, rt, ft = ff;
- for (i = 1;; i++) {
- rt = rf + i;
- if (rt >= BOARD_HEIGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
-}
-
-void
-SlideBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, rt, ft = ff;
- for (i = 1;; i++) {
- rt = rf - i;
- if (rt < 0) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
-}
-
-void
-SlideVertical (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- SlideForward(board, flags, rf, ff, callback, closure);
- SlideBackward(board, flags, rf, ff, callback, closure);
-}
-
-void
-SlideSideways (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, s, rt = rf, ft;
- for(s = -1; s <= 1; s+= 2) {
- for (i = 1;; i++) {
- ft = ff + i*s;
- if (ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- }
-}
-
-void
-SlideDiagForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, s, rt, ft;
- for(s = -1; s <= 1; s+= 2) {
- for (i = 1;; i++) {
- rt = rf + i;
- ft = ff + i * s;
- if (rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- }
-}
-
-void
-SlideDiagBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, s, rt, ft;
- for(s = -1; s <= 1; s+= 2) {
- for (i = 1;; i++) {
- rt = rf - i;
- ft = ff + i * s;
- if (rt < 0 || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- }
-}
-
-void
-Rook (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- SlideVertical(board, flags, rf, ff, callback, closure);
- SlideSideways(board, flags, rf, ff, callback, closure);
-}
-
-void
-Bishop (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- SlideDiagForward(board, flags, rf, ff, callback, closure);
- SlideDiagBackward(board, flags, rf, ff, callback, closure);
-}
-
-void
-Sting (Board board, int flags, int rf, int ff, int dy, int dx, MoveCallback callback, VOIDSTAR closure)
-{ // Lion-like move of Horned Falcon and Soaring Eagle
- int ft = ff + dx, rt = rf + dy;
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) return;
- legNr += 2;
- if (!SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, killX < 0 && board[rt][ft] != EmptySquare ? FirstLeg : NormalMove, rf, ff, rt, ft, closure);
- legNr -= 2;
- ft += dx; rt += dy;
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) return;
- legNr += 2;
- if (!SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- if (!SameColor(board[rf][ff], board[rf+dy][ff+dx]))
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- legNr -= 2;
-}
-
-void
-StepForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int ft = ff, rt = rf + 1;
- if (rt >= BOARD_HEIGHT) return;
- if (SameColor(board[rf][ff], board[rt][ft])) return;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
-}
-
-void
-StepBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int ft = ff, rt = rf - 1;
- if (rt < 0) return;
- if (SameColor(board[rf][ff], board[rt][ft])) return;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
-}
-
-void
-StepSideways (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int ft, rt = rf;
- ft = ff + 1;
- if (!(rt >= BOARD_HEIGHT || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- ft = ff - 1;
- if (!(rt >= BOARD_HEIGHT || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
-}
-
-void
-StepDiagForward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int ft, rt = rf + 1;
- if (rt >= BOARD_HEIGHT) return;
- ft = ff + 1;
- if (!(rt >= BOARD_HEIGHT || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- ft = ff - 1;
- if (!(rt >= BOARD_HEIGHT || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
-}
-
-void
-StepDiagBackward (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int ft, rt = rf - 1;
- if(rt < 0) return;
- ft = ff + 1;
- if (!(rt < 0 || ft >= BOARD_RGHT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- ft = ff - 1;
- if (!(rt < 0 || ft < BOARD_LEFT) && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
-}
-
-void
-StepVertical (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- StepForward(board, flags, rf, ff, callback, closure);
- StepBackward(board, flags, rf, ff, callback, closure);
-}
-
-void
-Ferz (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- StepDiagForward(board, flags, rf, ff, callback, closure);
- StepDiagBackward(board, flags, rf, ff, callback, closure);
-}
-
-void
-Wazir (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- StepVertical(board, flags, rf, ff, callback, closure);
- StepSideways(board, flags, rf, ff, callback, closure);
-}
-
-void
-Knight (Board board, int flags, int rf, int ff, MoveCallback callback, VOIDSTAR closure)
-{
- int i, j, s, rt, ft;
- for (i = -1; i <= 1; i += 2)
- for (j = -1; j <= 1; j += 2)
- for (s = 1; s <= 2; s++) {
- rt = rf + i*s;
- ft = ff + j*(3-s);
- if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
- && ( gameInfo.variant != VariantXiangqi || board[rf+i*(s-1)][ff+j*(2-s)] == EmptySquare)
- && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- }
-}
-
-/* Call callback once for each pseudo-legal move in the given
- position, except castling moves. A move is pseudo-legal if it is
- legal, or if it would be legal except that it leaves the king in
- check. In the arguments, epfile is EP_NONE if the previous move
- was not a double pawn push, or the file 0..7 if it was, or
- EP_UNKNOWN if we don't know and want to allow all e.p. captures.
- Promotion moves generated are to Queen only.
-*/
-void
-GenPseudoLegal (Board board, int flags, MoveCallback callback, VOIDSTAR closure, ChessSquare filter)
-// speed: only do moves with this piece type
-{
- int rf, ff;
- int i, j, d, s, fs, rs, rt, ft, m;
- int epfile = (signed char)board[EP_STATUS]; // [HGM] gamestate: extract ep status from board
- int promoRank = gameInfo.variant == VariantMakruk || gameInfo.variant == VariantGrand || gameInfo.variant == VariantChuChess ? 3 : 1;
-
- for (rf = 0; rf < BOARD_HEIGHT; rf++)
- for (ff = BOARD_LEFT; ff < BOARD_RGHT; ff++) {
- ChessSquare piece;
-
- if(board[rf][ff] == EmptySquare) continue;
- if ((flags & F_WHITE_ON_MOVE) != (board[rf][ff] < BlackPawn)) continue; // [HGM] speed: wrong color
- m = 0; piece = board[rf][ff];
- if(PieceToChar(piece) == '~')
- piece = (ChessSquare) ( DEMOTED(piece) );
- if(filter != EmptySquare && piece != filter) continue;
- if(pieceDefs && pieceDesc[piece]) { // [HGM] gen: use engine-defined moves
- MovesFromString(board, flags, ff, rf, -1, -1, 0, 0, pieceDesc[piece], callback, closure);
- continue;
- }
- if(IS_SHOGI(gameInfo.variant))
- piece = (ChessSquare) ( SHOGI piece );
-
- switch ((int)piece) {
- /* case EmptySquare: [HGM] this is nonsense, and conflicts with Shogi cases */
- default:
- /* can't happen ([HGM] except for faries...) */
- break;
-
- case WhitePawn:
- if(gameInfo.variant == VariantXiangqi) {
- /* [HGM] capture and move straight ahead in Xiangqi */
- if (rf < BOARD_HEIGHT-1 &&
- !SameColor(board[rf][ff], board[rf + 1][ff]) ) {
- callback(board, flags, NormalMove,
- rf, ff, rf + 1, ff, closure);
- }
- /* and move sideways when across the river */
- for (s = -1; s <= 1; s += 2) {
- if (rf >= BOARD_HEIGHT>>1 &&
- ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- !WhitePiece(board[rf][ff+s]) ) {
- callback(board, flags, NormalMove,
- rf, ff, rf, ff+s, closure);
- }
- }
- break;
- }
- if (rf < BOARD_HEIGHT-1 && board[rf + 1][ff] == EmptySquare) {
- callback(board, flags,
- rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove,
- rf, ff, rf + 1, ff, closure);
- }
- if (rf <= (BOARD_HEIGHT>>1)-3 && board[rf+1][ff] == EmptySquare && // [HGM] grand: also on 3rd rank on 10-board
- gameInfo.variant != VariantShatranj && /* [HGM] */
- gameInfo.variant != VariantCourier && /* [HGM] */
- board[rf+2][ff] == EmptySquare ) {
- callback(board, flags, NormalMove,
- rf, ff, rf+2, ff, closure);
- }
- for (s = -1; s <= 1; s += 2) {
- if (rf < BOARD_HEIGHT-1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- ((flags & F_KRIEGSPIEL_CAPTURE) ||
- BlackPiece(board[rf + 1][ff + s]))) {
- callback(board, flags,
- rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove,
- rf, ff, rf + 1, ff + s, closure);
- }
- if (rf >= BOARD_HEIGHT+1>>1) {// [HGM] grand: 4th & 5th rank on 10-board
- if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- (epfile == ff + s || epfile == EP_UNKNOWN) && rf < BOARD_HEIGHT-3 &&
- board[rf][ff + s] == BlackPawn &&
- board[rf+1][ff + s] == EmptySquare) {
- callback(board, flags, WhiteCapturesEnPassant,
- rf, ff, rf+1, ff + s, closure);
- }
- }
- }
- break;
-
- case BlackPawn:
- if(gameInfo.variant == VariantXiangqi) {
- /* [HGM] capture straight ahead in Xiangqi */
- if (rf > 0 && !SameColor(board[rf][ff], board[rf - 1][ff]) ) {
- callback(board, flags, NormalMove,
- rf, ff, rf - 1, ff, closure);
- }
- /* and move sideways when across the river */
- for (s = -1; s <= 1; s += 2) {
- if (rf < BOARD_HEIGHT>>1 &&
- ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- !BlackPiece(board[rf][ff+s]) ) {
- callback(board, flags, NormalMove,
- rf, ff, rf, ff+s, closure);
- }
- }
- break;
- }
- if (rf > 0 && board[rf - 1][ff] == EmptySquare) {
- callback(board, flags,
- rf <= promoRank ? BlackPromotion : NormalMove,
- rf, ff, rf - 1, ff, closure);
- }
- if (rf >= (BOARD_HEIGHT+1>>1)+2 && board[rf-1][ff] == EmptySquare && // [HGM] grand
- gameInfo.variant != VariantShatranj && /* [HGM] */
- gameInfo.variant != VariantCourier && /* [HGM] */
- board[rf-2][ff] == EmptySquare) {
- callback(board, flags, NormalMove,
- rf, ff, rf-2, ff, closure);
- }
- for (s = -1; s <= 1; s += 2) {
- if (rf > 0 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- ((flags & F_KRIEGSPIEL_CAPTURE) ||
- WhitePiece(board[rf - 1][ff + s]))) {
- callback(board, flags,
- rf <= promoRank ? BlackPromotion : NormalMove,
- rf, ff, rf - 1, ff + s, closure);
- }
- if (rf < BOARD_HEIGHT>>1) {
- if (ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- (epfile == ff + s || epfile == EP_UNKNOWN) && rf > 2 &&
- board[rf][ff + s] == WhitePawn &&
- board[rf-1][ff + s] == EmptySquare) {
- callback(board, flags, BlackCapturesEnPassant,
- rf, ff, rf-1, ff + s, closure);
- }
- }
- }
- break;
-
- case WhiteUnicorn:
- case BlackUnicorn:
- case WhiteKnight:
- case BlackKnight:
- for (i = -1; i <= 1; i += 2)
- for (j = -1; j <= 1; j += 2)
- for (s = 1; s <= 2; s++) {
- rt = rf + i*s;
- ft = ff + j*(3-s);
- if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
- && ( gameInfo.variant != VariantXiangqi || board[rf+i*(s-1)][ff+j*(2-s)] == EmptySquare)
- && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- }
- break;
-
- case SHOGI WhiteKnight:
- for (s = -1; s <= 1; s += 2) {
- if (rf < BOARD_HEIGHT-2 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- !SameColor(board[rf][ff], board[rf + 2][ff + s])) {
- callback(board, flags, NormalMove,
- rf, ff, rf + 2, ff + s, closure);
- }
- }
- break;
-
- case SHOGI BlackKnight:
- for (s = -1; s <= 1; s += 2) {
- if (rf > 1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT &&
- !SameColor(board[rf][ff], board[rf - 2][ff + s])) {
- callback(board, flags, NormalMove,
- rf, ff, rf - 2, ff + s, closure);
- }
- }
- break;
-
- case WhiteCannon:
- case BlackCannon:
- for (d = 0; d <= 1; d++)
- for (s = -1; s <= 1; s += 2) {
- m = 0;
- for (i = 1;; i++) {
- rt = rf + (i * s) * d;
- ft = ff + (i * s) * (1 - d);
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
- if (m == 0 && board[rt][ft] == EmptySquare)
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if (m == 1 && board[rt][ft] != EmptySquare &&
- !SameColor(board[rf][ff], board[rt][ft]) )
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare && m++) break;
- }
- }
- break;
-
- /* Gold General (and all its promoted versions) . First do the */
- /* diagonal forward steps, then proceed as normal Wazir */
- case SHOGI (PROMO WhitePawn):
- if(gameInfo.variant == VariantShogi) goto WhiteGold;
- case SHOGI (PROMO BlackPawn):
- if(gameInfo.variant == VariantShogi) goto BlackGold;
- SlideVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI (PROMO WhiteKnight):
- if(gameInfo.variant == VariantShogi) goto WhiteGold;
- case SHOGI BlackDrunk:
- case SHOGI BlackAlfil:
- Ferz(board, flags, rf, ff, callback, closure);
- StepSideways(board, flags, rf, ff, callback, closure);
- StepBackward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI (PROMO BlackKnight):
- if(gameInfo.variant == VariantShogi) goto BlackGold;
- case SHOGI WhiteDrunk:
- case SHOGI WhiteAlfil:
- Ferz(board, flags, rf, ff, callback, closure);
- StepSideways(board, flags, rf, ff, callback, closure);
- StepForward(board, flags, rf, ff, callback, closure);
- break;
-
-
- case SHOGI WhiteGnu:
- case SHOGI BlackGnu:
- if(gameInfo.variant == VariantShogi) goto BlackGold;
- SlideVertical(board, flags, rf, ff, callback, closure);
- Ferz(board, flags, rf, ff, callback, closure);
- StepSideways(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI (PROMO WhiteQueen):
- case SHOGI WhiteTokin:
- case SHOGI WhiteWazir:
- WhiteGold:
- StepDiagForward(board, flags, rf, ff, callback, closure);
- Wazir(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI (PROMO BlackQueen):
- case SHOGI BlackTokin:
- case SHOGI BlackWazir:
- BlackGold:
- StepDiagBackward(board, flags, rf, ff, callback, closure);
- Wazir(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteWazir:
- case BlackWazir:
- Wazir(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteMarshall:
- case SHOGI BlackMarshall:
- Ferz(board, flags, rf, ff, callback, closure);
- for (d = 0; d <= 1; d++)
- for (s = -2; s <= 2; s += 4) {
- rt = rf + s * d;
- ft = ff + s * (1 - d);
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
- if (!SameColor(board[rf][ff], board[rt][ft]) )
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- }
- break;
-
- case SHOGI WhiteAngel:
- case SHOGI BlackAngel:
- Wazir(board, flags, rf, ff, callback, closure);
-
- case WhiteAlfil:
- case BlackAlfil:
- /* [HGM] support Shatranj pieces */
- for (rs = -1; rs <= 1; rs += 2)
- for (fs = -1; fs <= 1; fs += 2) {
- rt = rf + 2 * rs;
- ft = ff + 2 * fs;
- if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
- && ( gameInfo.variant != VariantXiangqi ||
- board[rf+rs][ff+fs] == EmptySquare && (2*rf < BOARD_HEIGHT) == (2*rt < BOARD_HEIGHT) )
-
- && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier ||
- gameInfo.variant == VariantChu || gameInfo.variant == VariantXiangqi) continue; // classical Alfil
- rt = rf + rs; // in unknown variant we assume Modern Elephant, which can also do one step
- ft = ff + fs;
- if (!(rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT)
- && !SameColor(board[rf][ff], board[rt][ft]))
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- }
- if(gameInfo.variant == VariantSpartan)
- for(fs = -1; fs <= 1; fs += 2) {
- ft = ff + fs;
- if (!(ft < BOARD_LEFT || ft >= BOARD_RGHT) && board[rf][ft] == EmptySquare)
- callback(board, flags, NormalMove, rf, ff, rf, ft, closure);
- }
- break;
-
- /* Make Dragon-Horse also do Dababba moves outside Shogi, for better disambiguation in variant Fairy */
- case WhiteCardinal:
- case BlackCardinal:
- if(gameInfo.variant == VariantChuChess) goto DragonHorse;
- for (d = 0; d <= 1; d++) // Dababba moves that Rook cannot do
- for (s = -2; s <= 2; s += 4) {
- rt = rf + s * d;
- ft = ff + s * (1 - d);
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
- if (SameColor(board[rf][ff], board[rt][ft])) continue;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- }
-
- /* Shogi Dragon Horse has to continue with Wazir after Bishop */
- case SHOGI WhiteCardinal:
- case SHOGI BlackCardinal:
- case SHOGI WhitePCardinal:
- case SHOGI BlackPCardinal:
- DragonHorse:
- Bishop(board, flags, rf, ff, callback, closure);
- Wazir(board, flags, rf, ff, callback, closure);
- break;
-
- /* Capablanca Archbishop continues as Knight */
- case WhiteAngel:
- case BlackAngel:
- Knight(board, flags, rf, ff, callback, closure);
-
- /* Shogi Bishops are ordinary Bishops */
- case SHOGI WhiteBishop:
- case SHOGI BlackBishop:
- case SHOGI WhitePBishop:
- case SHOGI BlackPBishop:
- case WhiteBishop:
- case BlackBishop:
- Bishop(board, flags, rf, ff, callback, closure);
- break;
-
- /* Shogi Lance is unlike anything, and asymmetric at that */
- case SHOGI WhiteQueen:
- if(gameInfo.variant == VariantChu) goto doQueen;
- for(i = 1;; i++) {
- rt = rf + i;
- ft = ff;
- if (rt >= BOARD_HEIGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- break;
-
- case SHOGI BlackQueen:
- if(gameInfo.variant == VariantChu) goto doQueen;
- for(i = 1;; i++) {
- rt = rf - i;
- ft = ff;
- if (rt < 0) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- break;
-
- /* Make Dragon-King Dababba & Rook-like outside Shogi, for better disambiguation in variant Fairy */
- case WhiteDragon:
- case BlackDragon:
- if(gameInfo.variant == VariantChuChess) goto DragonKing;
- for (d = 0; d <= 1; d++) // Dababba moves that Rook cannot do
- for (s = -2; s <= 2; s += 4) {
- rt = rf + s * d;
- ft = ff + s * (1 - d);
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
- if (board[rf+rt>>1][ff+ft>>1] == EmptySquare && gameInfo.variant != VariantSpartan) continue;
- if (SameColor(board[rf][ff], board[rt][ft])) continue;
- callback(board, flags, NormalMove, rf, ff, rt, ft, closure);
- }
- if(gameInfo.variant == VariantSpartan) // in Spartan Chess restrict range to modern Dababba
- Wazir(board, flags, rf, ff, callback, closure);
- else
- Rook(board, flags, rf, ff, callback, closure);
- break;
-
- /* Shogi Dragon King has to continue as Ferz after Rook moves */
- case SHOGI WhiteDragon:
- case SHOGI BlackDragon:
- case SHOGI WhitePDragon:
- case SHOGI BlackPDragon:
- DragonKing:
- Rook(board, flags, rf, ff, callback, closure);
- Ferz(board, flags, rf, ff, callback, closure);
- break;
- m++;
-
- /* Capablanca Chancellor sets flag to continue as Knight */
- case WhiteMarshall:
- case BlackMarshall:
- Rook(board, flags, rf, ff, callback, closure);
- if(gameInfo.variant == VariantSpartan) // in Spartan Chess Chancellor is used for Dragon King.
- Ferz(board, flags, rf, ff, callback, closure);
- else
- Knight(board, flags, rf, ff, callback, closure);
- break;
-
- /* Shogi Rooks are ordinary Rooks */
- case SHOGI WhiteRook:
- case SHOGI BlackRook:
- case SHOGI WhitePRook:
- case SHOGI BlackPRook:
- case WhiteRook:
- case BlackRook:
- Rook(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteQueen:
- case BlackQueen:
- case SHOGI WhiteMother:
- case SHOGI BlackMother:
- doQueen:
- Rook(board, flags, rf, ff, callback, closure);
- Bishop(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhitePawn:
- StepForward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackPawn:
- StepBackward(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteMan:
- if(gameInfo.variant != VariantMakruk && gameInfo.variant != VariantASEAN) goto commoner;
- case SHOGI WhiteFerz:
- Ferz(board, flags, rf, ff, callback, closure);
- StepForward(board, flags, rf, ff, callback, closure);
- break;
-
- case BlackMan:
- if(gameInfo.variant != VariantMakruk && gameInfo.variant != VariantASEAN) goto commoner;
- case SHOGI BlackFerz:
- StepBackward(board, flags, rf, ff, callback, closure);
-
- case WhiteFerz:
- case BlackFerz:
- /* [HGM] support Shatranj pieces */
- Ferz(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteSilver:
- case BlackSilver:
- Knight(board, flags, rf, ff, callback, closure); // [HGM] superchess: use for Centaur
-
- commoner:
- case SHOGI WhiteMonarch:
- case SHOGI BlackMonarch:
- case SHOGI WhiteKing:
- case SHOGI BlackKing:
- case WhiteKing:
- case BlackKing:
- Ferz(board, flags, rf, ff, callback, closure);
- Wazir(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteNightrider:
- case BlackNightrider:
- for (i = -1; i <= 1; i += 2)
- for (j = -1; j <= 1; j += 2)
- for (s = 1; s <= 2; s++) { int k;
- for(k=1;; k++) {
- rt = rf + k*i*s;
- ft = ff + k*j*(3-s);
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) break;
- if (SameColor(board[rf][ff], board[rt][ft])) break;
- callback(board, flags, NormalMove,
- rf, ff, rt, ft, closure);
- if (board[rt][ft] != EmptySquare) break;
- }
- }
- break;
-
- Amazon:
- Bishop(board, flags, rf, ff, callback, closure);
- Rook(board, flags, rf, ff, callback, closure);
- Knight(board, flags, rf, ff, callback, closure);
- break;
-
- // Use Lance as Berolina / Spartan Pawn.
- case WhiteLance:
- if(gameInfo.variant == VariantSuper) goto Amazon;
- if (rf < BOARD_HEIGHT-1 && BlackPiece(board[rf + 1][ff]))
- callback(board, flags,
- rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove,
- rf, ff, rf + 1, ff, closure);
- for (s = -1; s <= 1; s += 2) {
- if (rf < BOARD_HEIGHT-1 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && board[rf + 1][ff + s] == EmptySquare)
- callback(board, flags,
- rf >= BOARD_HEIGHT-1-promoRank ? WhitePromotion : NormalMove,
- rf, ff, rf + 1, ff + s, closure);
- if (rf == 1 && ff + 2*s >= BOARD_LEFT && ff + 2*s < BOARD_RGHT && board[3][ff + 2*s] == EmptySquare )
- callback(board, flags, NormalMove, rf, ff, 3, ff + 2*s, closure);
- }
- break;
-
- case BlackLance:
- if(gameInfo.variant == VariantSuper) goto Amazon;
- if (rf > 0 && WhitePiece(board[rf - 1][ff]))
- callback(board, flags,
- rf <= promoRank ? BlackPromotion : NormalMove,
- rf, ff, rf - 1, ff, closure);
- for (s = -1; s <= 1; s += 2) {
- if (rf > 0 && ff + s >= BOARD_LEFT && ff + s < BOARD_RGHT && board[rf - 1][ff + s] == EmptySquare)
- callback(board, flags,
- rf <= promoRank ? BlackPromotion : NormalMove,
- rf, ff, rf - 1, ff + s, closure);
- if (rf == BOARD_HEIGHT-2 && ff + 2*s >= BOARD_LEFT && ff + 2*s < BOARD_RGHT && board[rf-2][ff + 2*s] == EmptySquare )
- callback(board, flags, NormalMove, rf, ff, rf-2, ff + 2*s, closure);
- }
- break;
-
- case SHOGI WhiteNothing:
- case SHOGI BlackNothing:
- case SHOGI WhiteLion:
- case SHOGI BlackLion:
- case WhiteLion:
- case BlackLion:
- for(rt = rf - 2; rt <= rf + 2; rt++) for(ft = ff - 2; ft <= ff + 2; ft++) {
- if (rt < 0 || rt >= BOARD_HEIGHT || ft < BOARD_LEFT || ft >= BOARD_RGHT) continue;
- if (!(ff == ft && rf == rt) && SameColor(board[rf][ff], board[rt][ft])) continue;
- i = (killX >= 0 && (rt-killY)*(rt-killY) + (killX-ft)*(killX-ft) < 3); legNr += 2*i;
- callback(board, flags, (rt-rf)*(rt-rf) + (ff-ft)*(ff-ft) < 3 && board[rt][ft] != EmptySquare && !i ? FirstLeg : NormalMove,
- rf, ff, rt, ft, closure);
- legNr -= 2*i;
- }
- break;
-
- case SHOGI WhiteFalcon:
- case SHOGI BlackFalcon:
- case SHOGI WhitePDagger:
- case SHOGI BlackPDagger:
- SlideSideways(board, flags, rf, ff, callback, closure);
- StepVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteCobra:
- case SHOGI BlackCobra:
- StepVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI (PROMO WhiteFerz):
- if(gameInfo.variant == VariantShogi) goto WhiteGold;
- case SHOGI (PROMO BlackFerz):
- if(gameInfo.variant == VariantShogi) goto BlackGold;
- case SHOGI WhitePSword:
- case SHOGI BlackPSword:
- SlideVertical(board, flags, rf, ff, callback, closure);
- StepSideways(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteUnicorn:
- case SHOGI BlackUnicorn:
- Ferz(board, flags, rf, ff, callback, closure);
- StepVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteMan:
- StepDiagForward(board, flags, rf, ff, callback, closure);
- StepVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackMan:
- StepDiagBackward(board, flags, rf, ff, callback, closure);
- StepVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteHCrown:
- case SHOGI BlackHCrown:
- Bishop(board, flags, rf, ff, callback, closure);
- SlideSideways(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteCrown:
- case SHOGI BlackCrown:
- Bishop(board, flags, rf, ff, callback, closure);
- SlideVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteCat:
- Sting(board, flags, rf, ff, 1, 0, callback, closure);
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- if(killX >= 0) break;
- Bishop(board, flags, rf, ff, callback, closure);
- SlideSideways(board, flags, rf, ff, callback, closure);
- SlideBackward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackCat:
- Sting(board, flags, rf, ff, -1, 0, callback, closure);
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- if(killX >= 0) break;
- Bishop(board, flags, rf, ff, callback, closure);
- SlideSideways(board, flags, rf, ff, callback, closure);
- SlideForward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteDagger:
- Sting(board, flags, rf, ff, 1, 1, callback, closure);
- Sting(board, flags, rf, ff, 1, -1, callback, closure);
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- if(killX >= 0) break;
- Rook(board, flags, rf, ff, callback, closure);
- SlideDiagBackward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackDagger:
- Sting(board, flags, rf, ff, -1, 1, callback, closure);
- Sting(board, flags, rf, ff, -1, -1, callback, closure);
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- if(killX >= 0) break;
- Rook(board, flags, rf, ff, callback, closure);
- SlideDiagForward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteDolphin:
- case SHOGI BlackHorse:
- SlideDiagBackward(board, flags, rf, ff, callback, closure);
- SlideVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackDolphin:
- case SHOGI WhiteHorse:
- SlideDiagForward(board, flags, rf, ff, callback, closure);
- SlideVertical(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI WhiteLance:
- SlideForward(board, flags, rf, ff, callback, closure);
- break;
-
- case SHOGI BlackLance:
- SlideBackward(board, flags, rf, ff, callback, closure);
- break;
-
- case WhiteFalcon: // [HGM] wild: for wildcards, self-capture symbolizes move to anywhere
- case BlackFalcon:
- case WhiteCobra:
- case BlackCobra:
- callback(board, flags, NormalMove, rf, ff, rf, ff, closure);
- break;
-
- }
- }
-}
-
-
-typedef struct {
- MoveCallback cb;
- VOIDSTAR cl;
-} GenLegalClosure;
-
-int rFilter, fFilter; // [HGM] speed: sorry, but I get a bit tired of this closure madness
-Board xqCheckers, nullBoard;
-
-extern void GenLegalCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-GenLegalCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register GenLegalClosure *cl = (GenLegalClosure *) closure;
-
- if(rFilter >= 0 && rFilter != rt || fFilter >= 0 && fFilter != ft) return; // [HGM] speed: ignore moves with wrong to-square
-
- if ((int)board[EP_STATUS] == EP_IRON_LION && (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion)) return; //[HGM] lion
-
- if (!(flags & F_IGNORE_CHECK) ) {
- int check, promo = (gameInfo.variant == VariantSpartan && kind == BlackPromotion);
- if(promo) {
- int r, f, kings=0;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++)
- kings += (board[r][f] == BlackKing);
- if(kings >= 2)
- promo = 0;
- else
- board[rf][ff] = BlackKing; // [HGM] spartan: promote to King before check-test
- }
- check = CheckTest(board, flags, rf, ff, rt, ft,
- kind == WhiteCapturesEnPassant ||
- kind == BlackCapturesEnPassant);
- if(promo) board[rf][ff] = BlackLance;
- if(check) return;
- }
- if (flags & F_ATOMIC_CAPTURE) {
- if (board[rt][ft] != EmptySquare ||
- kind == WhiteCapturesEnPassant || kind == BlackCapturesEnPassant) {
- int r, f;
- ChessSquare king = (flags & F_WHITE_ON_MOVE) ? WhiteKing : BlackKing;
- if (board[rf][ff] == king) return;
- for (r = rt-1; r <= rt+1; r++) {
- for (f = ft-1; f <= ft+1; f++) {
- if (r >= 0 && r < BOARD_HEIGHT && f >= BOARD_LEFT && f < BOARD_RGHT &&
- board[r][f] == king) return;
- }
- }
- }
- }
- cl->cb(board, flags, kind, rf, ff, rt, ft, cl->cl);
-}
-
-
-typedef struct {
- int rf, ff, rt, ft;
- ChessMove kind;
- int captures; // [HGM] losers
-} LegalityTestClosure;
-
-
-/* Like GenPseudoLegal, but (1) include castling moves, (2) unless
- F_IGNORE_CHECK is set in the flags, omit moves that would leave the
- king in check, and (3) if F_ATOMIC_CAPTURE is set in the flags, omit
- moves that would destroy your own king. The CASTLE_OK flags are
- true if castling is not yet ruled out by a move of the king or
- rook. Return TRUE if the player on move is currently in check and
- F_IGNORE_CHECK is not set. [HGM] add castlingRights parameter */
-int
-GenLegal (Board board, int flags, MoveCallback callback, VOIDSTAR closure, ChessSquare filter)
-{
- GenLegalClosure cl;
- int ff, ft, k, left, right, swap;
- int ignoreCheck = (flags & F_IGNORE_CHECK) != 0;
- ChessSquare wKing = WhiteKing, bKing = BlackKing, *castlingRights = board[CASTLING];
- int inCheck = !ignoreCheck && CheckTest(board, flags, -1, -1, -1, -1, FALSE); // kludge alert: this would mark pre-existing checkers if status==1
- char *p;
-
- cl.cb = callback;
- cl.cl = closure;
- xqCheckers[EP_STATUS] *= 2; // quasi: if previous CheckTest has been marking, we now set flag for suspending same checkers
- if(filter == EmptySquare) rFilter = fFilter = -1; // [HGM] speed: do not filter on square if we do not filter on piece
- GenPseudoLegal(board, flags, GenLegalCallback, (VOIDSTAR) &cl, filter);
-
- if (inCheck) return TRUE;
-
- /* Generate castling moves */
- if(gameInfo.variant == VariantKnightmate) { /* [HGM] Knightmate */
- wKing = WhiteUnicorn; bKing = BlackUnicorn;
- }
-
- p = (flags & F_WHITE_ON_MOVE ? pieceDesc[wKing] : pieceDesc[bKing]);
- if(p && strchr(p, 'O')) return FALSE; // [HGM] gen: castlings were already generated from string
-
- for (ff = BOARD_WIDTH>>1; ff >= (BOARD_WIDTH-1)>>1; ff-- /*ics wild 1*/) {
- if ((flags & F_WHITE_ON_MOVE) &&
- (flags & F_WHITE_KCASTLE_OK) &&
- board[0][ff] == wKing &&
- board[0][ff + 1] == EmptySquare &&
- board[0][ff + 2] == EmptySquare &&
- board[0][BOARD_RGHT-3] == EmptySquare &&
- board[0][BOARD_RGHT-2] == EmptySquare &&
- board[0][BOARD_RGHT-1] == WhiteRook &&
- castlingRights[0] != NoRights && /* [HGM] check rights */
- ( castlingRights[2] == ff || castlingRights[6] == ff ) &&
- (ignoreCheck ||
- (!CheckTest(board, flags, 0, ff, 0, ff + 1, FALSE) &&
- !CheckTest(board, flags, 0, ff, 0, BOARD_RGHT-3, FALSE) &&
- (gameInfo.variant != VariantJanus || !CheckTest(board, flags, 0, ff, 0, BOARD_RGHT-2, FALSE)) &&
- !CheckTest(board, flags, 0, ff, 0, ff + 2, FALSE)))) {
-
- callback(board, flags,
- ff==BOARD_WIDTH>>1 ? WhiteKingSideCastle : WhiteKingSideCastleWild,
- 0, ff, 0, ff + ((gameInfo.boardWidth+2)>>2) + (gameInfo.variant == VariantJanus), closure);
- }
- if ((flags & F_WHITE_ON_MOVE) &&
- (flags & F_WHITE_QCASTLE_OK) &&
- board[0][ff] == wKing &&
- board[0][ff - 1] == EmptySquare &&
- board[0][ff - 2] == EmptySquare &&
- board[0][BOARD_LEFT+2] == EmptySquare &&
- board[0][BOARD_LEFT+1] == EmptySquare &&
- board[0][BOARD_LEFT+0] == WhiteRook &&
- castlingRights[1] != NoRights && /* [HGM] check rights */
- ( castlingRights[2] == ff || castlingRights[6] == ff ) &&
- (ignoreCheck ||
- (!CheckTest(board, flags, 0, ff, 0, ff - 1, FALSE) &&
- !CheckTest(board, flags, 0, ff, 0, BOARD_LEFT+3, FALSE) &&
- !CheckTest(board, flags, 0, ff, 0, ff - 2, FALSE)))) {
-
- callback(board, flags,
- ff==BOARD_WIDTH>>1 ? WhiteQueenSideCastle : WhiteQueenSideCastleWild,
- 0, ff, 0, ff - ((gameInfo.boardWidth+2)>>2), closure);
- }
- if (!(flags & F_WHITE_ON_MOVE) &&
- (flags & F_BLACK_KCASTLE_OK) &&
- board[BOARD_HEIGHT-1][ff] == bKing &&
- board[BOARD_HEIGHT-1][ff + 1] == EmptySquare &&
- board[BOARD_HEIGHT-1][ff + 2] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_RGHT-3] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_RGHT-2] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_RGHT-1] == BlackRook &&
- castlingRights[3] != NoRights && /* [HGM] check rights */
- ( castlingRights[5] == ff || castlingRights[7] == ff ) &&
- (ignoreCheck ||
- (!CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + 1, FALSE) &&
- !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_RGHT-3, FALSE) &&
- (gameInfo.variant != VariantJanus || !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_RGHT-2, FALSE)) &&
- !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + 2, FALSE)))) {
-
- callback(board, flags,
- ff==BOARD_WIDTH>>1 ? BlackKingSideCastle : BlackKingSideCastleWild,
- BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff + ((gameInfo.boardWidth+2)>>2) + (gameInfo.variant == VariantJanus), closure);
- }
- if (!(flags & F_WHITE_ON_MOVE) &&
- (flags & F_BLACK_QCASTLE_OK) &&
- board[BOARD_HEIGHT-1][ff] == bKing &&
- board[BOARD_HEIGHT-1][ff - 1] == EmptySquare &&
- board[BOARD_HEIGHT-1][ff - 2] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_LEFT+2] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_LEFT+1] == EmptySquare &&
- board[BOARD_HEIGHT-1][BOARD_LEFT+0] == BlackRook &&
- castlingRights[4] != NoRights && /* [HGM] check rights */
- ( castlingRights[5] == ff || castlingRights[7] == ff ) &&
- (ignoreCheck ||
- (!CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - 1, FALSE) &&
- !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, BOARD_LEFT+3, FALSE) &&
- !CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - 2, FALSE)))) {
-
- callback(board, flags,
- ff==BOARD_WIDTH>>1 ? BlackQueenSideCastle : BlackQueenSideCastleWild,
- BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ff - ((gameInfo.boardWidth+2)>>2), closure);
- }
- }
-
- if((swap = gameInfo.variant == VariantSChess) || flags & F_FRC_TYPE_CASTLING) {
-
- /* generate all potential FRC castling moves (KxR), ignoring flags */
- /* [HGM] test if the Rooks we find have castling rights */
- /* In S-Chess we generate RxK for allowed castlings, for gating at Rook square */
-
-
- if ((flags & F_WHITE_ON_MOVE) != 0) {
- ff = castlingRights[2]; /* King file if we have any rights */
- if(ff != NoRights && board[0][ff] == WhiteKing) {
- if (appData.debugMode) {
- fprintf(debugFP, "FRC castling, %d %d %d %d %d %d\n",
- castlingRights[0],castlingRights[1],ff,castlingRights[3],castlingRights[4],castlingRights[5]);
- }
- ft = castlingRights[0]; /* Rook file if we have H-side rights */
- left = ff+1;
- right = BOARD_RGHT-2;
- if(ff == BOARD_RGHT-2) left = right = ff-1; /* special case */
- for(k=left; k<=right && ft != NoRights; k++) /* first test if blocked */
- if(k != ft && board[0][k] != EmptySquare) ft = NoRights;
- for(k=left; k<right && ft != NoRights; k++) /* then if not checked */
- if(!ignoreCheck && CheckTest(board, flags, 0, ff, 0, k, FALSE)) ft = NoRights;
- if(ft != NoRights && board[0][ft] == WhiteRook) {
- if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, WhiteHSideCastleFR, 0, ff, 0, ft, closure);
- if(swap) callback(board, flags, WhiteHSideCastleFR, 0, ft, 0, ff, closure);
- }
-
- ft = castlingRights[1]; /* Rook file if we have A-side rights */
- left = BOARD_LEFT+2;
- right = ff-1;
- if(ff <= BOARD_LEFT+2) { left = ff+1; right = BOARD_LEFT+3; }
- for(k=left; k<=right && ft != NoRights; k++) /* first test if blocked */
- if(k != ft && board[0][k] != EmptySquare) ft = NoRights;
- if(ft == 0 && ff != 1 && board[0][1] != EmptySquare) ft = NoRights; /* Rook can be blocked on b1 */
- if(ff > BOARD_LEFT+2)
- for(k=left+1; k<=right && ft != NoRights; k++) /* then if not checked */
- if(!ignoreCheck && CheckTest(board, flags, 0, ff, 0, k, FALSE)) ft = NoRights;
- if(ft != NoRights && board[0][ft] == WhiteRook) {
- if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, WhiteASideCastleFR, 0, ff, 0, ft, closure);
- if(swap) callback(board, flags, WhiteASideCastleFR, 0, ft, 0, ff, closure);
- }
- }
- } else {
- ff = castlingRights[5]; /* King file if we have any rights */
- if(ff != NoRights && board[BOARD_HEIGHT-1][ff] == BlackKing) {
- ft = castlingRights[3]; /* Rook file if we have H-side rights */
- left = ff+1;
- right = BOARD_RGHT-2;
- if(ff == BOARD_RGHT-2) left = right = ff-1; /* special case */
- for(k=left; k<=right && ft != NoRights; k++) /* first test if blocked */
- if(k != ft && board[BOARD_HEIGHT-1][k] != EmptySquare) ft = NoRights;
- for(k=left; k<right && ft != NoRights; k++) /* then if not checked */
- if(!ignoreCheck && CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, k, FALSE)) ft = NoRights;
- if(ft != NoRights && board[BOARD_HEIGHT-1][ft] == BlackRook) {
- if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, BlackHSideCastleFR, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure);
- if(swap) callback(board, flags, BlackHSideCastleFR, BOARD_HEIGHT-1, ft, BOARD_HEIGHT-1, ff, closure);
- }
-
- ft = castlingRights[4]; /* Rook file if we have A-side rights */
- left = BOARD_LEFT+2;
- right = ff-1;
- if(ff <= BOARD_LEFT+2) { left = ff+1; right = BOARD_LEFT+3; }
- for(k=left; k<=right && ft != NoRights; k++) /* first test if blocked */
- if(k != ft && board[BOARD_HEIGHT-1][k] != EmptySquare) ft = NoRights;
- if(ft == 0 && ff != 1 && board[BOARD_HEIGHT-1][1] != EmptySquare) ft = NoRights; /* Rook can be blocked on b8 */
- if(ff > BOARD_LEFT+2)
- for(k=left+1; k<=right && ft != NoRights; k++) /* then if not checked */
- if(!ignoreCheck && CheckTest(board, flags, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, k, FALSE)) ft = NoRights;
- if(ft != NoRights && board[BOARD_HEIGHT-1][ft] == BlackRook) {
- if(flags & F_FRC_TYPE_CASTLING) callback(board, flags, BlackASideCastleFR, BOARD_HEIGHT-1, ff, BOARD_HEIGHT-1, ft, closure);
- if(swap) callback(board, flags, BlackASideCastleFR, BOARD_HEIGHT-1, ft, BOARD_HEIGHT-1, ff, closure);
- }
- }
- }
-
- }
-
- return FALSE;
-}
-
-
-typedef struct {
- int rking, fking;
- int check;
-} CheckTestClosure;
-
-
-extern void CheckTestCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-
-void
-CheckTestCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register CheckTestClosure *cl = (CheckTestClosure *) closure;
-
- if (rt == cl->rking && ft == cl->fking) {
- if((int)xqCheckers[EP_STATUS] >= 2 && xqCheckers[rf][ff]) return; // checker is piece with suspended checking power
- cl->check++;
- xqCheckers[rf][ff] = xqCheckers[EP_STATUS] & 1; // remember who is checking (if status == 1)
- }
- if( (int)board[EP_STATUS] == EP_ROYAL_LION && (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion)
- && (gameInfo.variant != VariantLion || board[rf][ff] != WhiteKing && board[rf][ff] != BlackKing) )
- cl->check++; // [HGM] lion: forbidden counterstrike against Lion equated to putting yourself in check
-}
-
-
-/* If the player on move were to move from (rf, ff) to (rt, ft), would
- he leave himself in check? Or if rf == -1, is the player on move
- in check now? enPassant must be TRUE if the indicated move is an
- e.p. capture. The possibility of castling out of a check along the
- back rank is not accounted for (i.e., we still return nonzero), as
- this is illegal anyway. Return value is the number of times the
- king is in check. */
-int
-CheckTest (Board board, int flags, int rf, int ff, int rt, int ft, int enPassant)
-{
- CheckTestClosure cl;
- ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing;
- ChessSquare captured = EmptySquare, ep=0, trampled=0, trampled2 = 0;
- int saveKill = killX;
- /* Suppress warnings on uninitialized variables */
-
- if(gameInfo.variant == VariantXiangqi)
- king = flags & F_WHITE_ON_MOVE ? WhiteWazir : BlackWazir;
- if(gameInfo.variant == VariantKnightmate)
- king = flags & F_WHITE_ON_MOVE ? WhiteUnicorn : BlackUnicorn;
- if(gameInfo.variant == VariantChu || gameInfo.variant == VariantShogi) { // strictly speaking this is not needed, as Chu officially has no check
- int r, f, k = king, royals=0, prince = flags & F_WHITE_ON_MOVE ? WhiteMonarch : BlackMonarch;
- if(gameInfo.variant == VariantShogi) prince -= 11; // White/BlackFalcon
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
- if(board[r][f] == k || board[r][f] == prince) {
- if(++royals > 1) return FALSE; // no check if we have two royals (ignores double captureby Lion!)
- king = board[r][f]; // remember hich one we had
- }
- }
- }
-
- if (rt >= 0) {
- if (enPassant) {
- captured = board[rf][ft];
- board[rf][ft] = EmptySquare;
- } else {
- captured = board[rt][ft];
- if(killX >= 0) {
- trampled = board[killY][killX]; board[killY][killX] = EmptySquare; killX = -1; saveKill += (kill2X << 16) + (1 << 30);
- if(kill2X >= 0) { trampled2 = board[kill2Y][kill2X]; board[kill2Y][kill2X] = EmptySquare; kill2X = -1; }
- }
- }
- if(rf == DROP_RANK) board[rt][ft] = ff; else { // [HGM] drop
- board[rt][ft] = board[rf][ff];
- if(rf != rt || ff != ft) board[rf][ff] = EmptySquare;
- }
- ep = board[EP_STATUS];
- if( captured == WhiteLion || captured == BlackLion ) { // [HGM] lion: Chu Lion-capture rules
- ChessSquare victim = saveKill < 0 ? EmptySquare : trampled;
- if( (board[rt][ft] == WhiteLion || board[rt][ft] == BlackLion) && // capturer is Lion
- (ff - ft > 1 || ft - ff > 1 || rf - rt > 1 || rt - rf > 1) && // captures from a distance
- (victim == EmptySquare || victim == WhitePawn || victim == BlackPawn // no or worthless 'bridge'
- || victim == WhiteCobra || victim == BlackCobra) ) // (Pawn or Go Between)
- board[EP_STATUS] = EP_ROYAL_LION; // on distant Lion x Lion victim must not be pseudo-legally protected
- }
- }
-
- /* For compatibility with ICS wild 9, we scan the board in the
- order a1, a2, a3, ... b1, b2, ..., h8 to find the first king,
- and we test only whether that one is in check. */
- for (cl.fking = BOARD_LEFT+0; cl.fking < BOARD_RGHT; cl.fking++)
- for (cl.rking = 0; cl.rking < BOARD_HEIGHT; cl.rking++) {
- if (board[cl.rking][cl.fking] == king) {
- cl.check = 0;
- if(gameInfo.variant == VariantXiangqi) {
- /* [HGM] In Xiangqi opposing Kings means check as well */
- int i, dir;
- dir = (king >= BlackPawn) ? -1 : 1;
- for( i=cl.rking+dir; i>=0 && i<BOARD_HEIGHT &&
- board[i][cl.fking] == EmptySquare; i+=dir );
- if(i>=0 && i<BOARD_HEIGHT &&
- board[i][cl.fking] == (dir>0 ? BlackWazir : WhiteWazir) )
- cl.check++;
- }
- GenPseudoLegal(board, flags ^ F_WHITE_ON_MOVE, CheckTestCallback, (VOIDSTAR) &cl, EmptySquare);
- if(gameInfo.variant != VariantSpartan || cl.check == 0) // in Spartan Chess go on to test if other King is checked too
- goto undo_move; /* 2-level break */
- }
- }
-
- undo_move:
-
- if (rt >= 0) {
- if(rf != DROP_RANK) // [HGM] drop
- board[rf][ff] = board[rt][ft];
- if (enPassant) {
- board[rf][ft] = captured;
- board[rt][ft] = EmptySquare;
- } else {
- if(saveKill >= 0) {
- if(saveKill & 1<<30) board[kill2Y][kill2X = saveKill >> 16 & 0xFFF] = trampled2;
- board[killY][killX = saveKill & 0xFFF] = trampled;
- }
- board[rt][ft] = captured;
- }
- board[EP_STATUS] = ep;
- }
-
- return cl.fking < BOARD_RGHT ? cl.check : 1000; // [HGM] atomic: return 1000 if we have no king
-}
-
-int
-HasLion (Board board, int flags)
-{
- int lion = F_WHITE_ON_MOVE & flags ? WhiteLion : BlackLion;
- int r, f;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++)
- if(board[r][f] == lion) return 1;
- return 0;
-}
-
-ChessMove
-LegalDrop (Board board, int flags, ChessSquare piece, int rt, int ft)
-{ // [HGM] put drop legality testing in separate routine for clarity
- int n;
-if(appData.debugMode) fprintf(debugFP, "LegalDrop: %d @ %d,%d)\n", piece, ft, rt);
- if(board[rt][ft] != EmptySquare) return ImpossibleMove; // must drop to empty square
- n = PieceToNumber(piece);
- if((gameInfo.holdingsWidth == 0 || (flags & F_WHITE_ON_MOVE ? board[n][BOARD_WIDTH-1] : board[BOARD_HEIGHT-1-n][0]) != piece)
- && gameInfo.variant != VariantBughouse) // in bughouse we don't check for availability, because ICS doesn't always tell us
- return ImpossibleMove; // piece not available
- if(gameInfo.variant == VariantShogi) { // in Shogi lots of drops are forbidden!
- if((piece == WhitePawn || piece == WhiteQueen) && rt == BOARD_HEIGHT-1 ||
- (piece == BlackPawn || piece == BlackQueen) && rt == 0 ||
- piece == WhiteKnight && rt > BOARD_HEIGHT-3 ||
- piece == BlackKnight && rt < 2 ) return IllegalMove; // e.g. where dropped piece has no moves
- if(piece == WhitePawn || piece == BlackPawn) {
- int r, max = 1 + (BOARD_HEIGHT == 7); // two Pawns per file in Tori!
- for(r=1; r<BOARD_HEIGHT-1; r++)
- if(!(max -= (board[r][ft] == piece))) return IllegalMove; // or there already is a Pawn in file
- // should still test if we mate with this Pawn
- }
- } else if(gameInfo.variant == VariantSChess) { // only back-rank drops
- if (rt != (piece < BlackPawn ? 0 : BOARD_HEIGHT-1)) return IllegalMove;
- } else {
- if( (piece == WhitePawn || piece == BlackPawn) &&
- (rt == 0 || rt == BOARD_HEIGHT -1 ) )
- return IllegalMove; /* no pawn drops on 1st/8th */
- }
-if(appData.debugMode) fprintf(debugFP, "LegalDrop: %d @ %d,%d)\n", piece, ft, rt);
- if (!(flags & F_IGNORE_CHECK) &&
- CheckTest(board, flags, DROP_RANK, piece, rt, ft, FALSE) ) return IllegalMove;
- return flags & F_WHITE_ON_MOVE ? WhiteDrop : BlackDrop;
-}
-
-extern void LegalityTestCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-LegalityTestCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register LegalityTestClosure *cl = (LegalityTestClosure *) closure;
-
- if(board[rt][ft] != EmptySquare || kind==WhiteCapturesEnPassant || kind==BlackCapturesEnPassant)
- cl->captures++; // [HGM] losers: count legal captures
- if (rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft)
- cl->kind = kind;
-}
-
-ChessMove
-LegalityTest (Board board, int flags, int rf, int ff, int rt, int ft, int promoChar)
-{
- LegalityTestClosure cl; ChessSquare piece, filterPiece;
-
- if(quickFlag) flags = flags & ~1 | quickFlag & 1; // [HGM] speed: in quick mode quickFlag specifies side-to-move.
- if(rf == DROP_RANK) return LegalDrop(board, flags, ff, rt, ft);
- piece = filterPiece = board[rf][ff];
- if(PieceToChar(piece) == '~') filterPiece = DEMOTED(piece);
-
- /* [HGM] Cobra and Falcon are wildcard pieces; consider all their moves legal */
- /* (perhaps we should disallow moves that obviously leave us in check?) */
- if((piece == WhiteFalcon || piece == BlackFalcon ||
- piece == WhiteCobra || piece == BlackCobra) && gameInfo.variant != VariantChu && !pieceDesc[piece])
- return CheckTest(board, flags, rf, ff, rt, ft, FALSE) ? IllegalMove : NormalMove;
-
- cl.rf = rf;
- cl.ff = ff;
- cl.rt = rFilter = rt; // [HGM] speed: filter on to-square
- cl.ft = fFilter = ft;
- cl.kind = IllegalMove;
- cl.captures = 0; // [HGM] losers: prepare to count legal captures.
- if(flags & F_MANDATORY_CAPTURE) filterPiece = EmptySquare; // [HGM] speed: do not filter in suicide, to find all captures
- GenLegal(board, flags, LegalityTestCallback, (VOIDSTAR) &cl, filterPiece);
- if((flags & F_MANDATORY_CAPTURE) && cl.captures && board[rt][ft] == EmptySquare
- && cl.kind != WhiteCapturesEnPassant && cl.kind != BlackCapturesEnPassant)
- return(IllegalMove); // [HGM] losers: if there are legal captures, non-capts are illegal
-
- if(promoChar == 'x') promoChar = NULLCHAR; // [HGM] is this ever the case?
- if(gameInfo.variant == VariantSChess && promoChar && promoChar != '=' && board[rf][ff] != WhitePawn && board[rf][ff] != BlackPawn) {
- if(board[rf][ff] < BlackPawn) { // white
- if(rf != 0) return IllegalMove; // must be on back rank
- if(!(board[VIRGIN][ff] & VIRGIN_W)) return IllegalMove; // non-virgin
- if(board[PieceToNumber(CharToPiece(ToUpper(promoChar)))][BOARD_WIDTH-2] == 0) return ImpossibleMove;// must be in stock
- if(cl.kind == WhiteHSideCastleFR && (ff == BOARD_RGHT-2 || ff == BOARD_RGHT-3)) return ImpossibleMove;
- if(cl.kind == WhiteASideCastleFR && (ff == BOARD_LEFT+2 || ff == BOARD_LEFT+3)) return ImpossibleMove;
- } else {
- if(rf != BOARD_HEIGHT-1) return IllegalMove;
- if(!(board[VIRGIN][ff] & VIRGIN_B)) return IllegalMove; // non-virgin
- if(board[BOARD_HEIGHT-1-PieceToNumber(CharToPiece(ToLower(promoChar)))][1] == 0) return ImpossibleMove;
- if(cl.kind == BlackHSideCastleFR && (ff == BOARD_RGHT-2 || ff == BOARD_RGHT-3)) return ImpossibleMove;
- if(cl.kind == BlackASideCastleFR && (ff == BOARD_LEFT+2 || ff == BOARD_LEFT+3)) return ImpossibleMove;
- }
- } else
- if(gameInfo.variant == VariantChu) {
- if(cl.kind != NormalMove || promoChar == NULLCHAR || promoChar == '=') return cl.kind;
- if(promoChar != '+')
- return CharToPiece(promoChar) == EmptySquare ? ImpossibleMove : IllegalMove;
- if(PieceToChar(CHUPROMOTED(board[rf][ff])) != '+') {
- if(PieceToChar(CHUPROMOTED (board[rf][ff] < BlackPawn ? WhitePawn : BlackPawn)) != '.')
- return ImpossibleMove;
- }
- return flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion;
- } else
- if(gameInfo.variant == VariantShogi) {
- /* [HGM] Shogi promotions. '=' means defer */
- if(rf != DROP_RANK && cl.kind == NormalMove) {
- ChessSquare piece = board[rf][ff];
- int zone = BOARD_HEIGHT/3 + (BOARD_HEIGHT == 8);
-
- if(promoChar == PieceToChar(BlackQueen)) promoChar = NULLCHAR; /* [HGM] Kludge */
- if(promoChar == 'd' && (piece == WhiteRook || piece == BlackRook) ||
- promoChar == 'h' && (piece == WhiteBishop || piece == BlackBishop) ||
- promoChar == 'g' && (piece <= WhiteFerz || piece <= BlackFerz && piece >= BlackPawn) )
- promoChar = '+'; // allowed ICS notations
-if(appData.debugMode)fprintf(debugFP,"SHOGI promoChar = %c\n", promoChar ? promoChar : '-');
- if(promoChar != NULLCHAR && promoChar != '+' && promoChar != '=')
- return CharToPiece(promoChar) == EmptySquare ? ImpossibleMove : IllegalMove;
- else if(flags & F_WHITE_ON_MOVE) {
- if( (int) piece < (int) WhiteWazir &&
- (rf >= BOARD_HEIGHT - zone || rt >= BOARD_HEIGHT - zone) ) {
- if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 ||
- piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */
- cl.kind = promoChar == '=' ? IllegalMove : WhitePromotion;
- else /* promotion optional, default is defer */
- cl.kind = promoChar == '+' ? WhitePromotion : WhiteNonPromotion;
- } else cl.kind = promoChar == '+' ? IllegalMove : NormalMove;
- } else {
- if( (int) piece < (int) BlackWazir && (rf < zone || rt < zone) ) {
- if( (piece == BlackPawn || piece == BlackQueen) && rt < 1 ||
- piece == BlackKnight && rt < 2 ) /* promotion obligatory */
- cl.kind = promoChar == '=' ? IllegalMove : BlackPromotion;
- else /* promotion optional, default is defer */
- cl.kind = promoChar == '+' ? BlackPromotion : BlackNonPromotion;
- } else cl.kind = promoChar == '+' ? IllegalMove : NormalMove;
- }
- }
- } else
- if (promoChar != NULLCHAR) {
- if(cl.kind == NormalMove && promoChar == '+') { // allow shogi-style promotion is pieceToChar specifies them
- ChessSquare piece = board[rf][ff];
- if(piece < BlackPawn ? piece > WhiteMan : piece > BlackMan) return ImpossibleMove; // already promoted
- // should test if in zone, really
- if(gameInfo.variant == VariantChuChess && (piece == WhiteKnight || piece == BlackKnight) && HasLion(board, flags))
- return IllegalMove;
- if(PieceToChar(PROMOTED(piece)) == '+') return flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion;
- } else
- if(promoChar == '=') cl.kind = IllegalMove; else // [HGM] shogi: no deferred promotion outside Shogi
- if (cl.kind == WhitePromotion || cl.kind == BlackPromotion) {
- ChessSquare piece = CharToPiece(flags & F_WHITE_ON_MOVE ? ToUpper(promoChar) : ToLower(promoChar));
- if(piece == EmptySquare)
- cl.kind = ImpossibleMove; // non-existing piece
- if(gameInfo.variant == VariantChuChess && promoChar == 'l' && HasLion(board, flags)) {
- cl.kind = IllegalMove; // no two Lions
- } else if(gameInfo.variant == VariantSpartan && cl.kind == BlackPromotion ) {
- if(promoChar != PieceToChar(BlackKing)) {
- if(CheckTest(board, flags, rf, ff, rt, ft, FALSE)) cl.kind = IllegalMove; // [HGM] spartan: only promotion to King was possible
- if(piece == BlackLance) cl.kind = ImpossibleMove;
- } else { // promotion to King allowed only if we do not have two yet
- int r, f, kings = 0;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) kings += (board[r][f] == BlackKing);
- if(kings == 2) cl.kind = IllegalMove;
- }
- } else if(piece == WhitePawn && rt == BOARD_HEIGHT-1 ||
- piece == BlackPawn && rt == 0) cl.kind = IllegalMove; // cannot stay Pawn on last rank in any variant
- else if((piece == WhiteUnicorn || piece == BlackUnicorn) && gameInfo.variant == VariantKnightmate)
- cl.kind = IllegalMove; // promotion to Royal Knight not allowed
- else if((piece == WhiteKing || piece == BlackKing) && gameInfo.variant != VariantSuicide && gameInfo.variant != VariantGiveaway)
- cl.kind = IllegalMove; // promotion to King usually not allowed
- } else {
- cl.kind = IllegalMove;
- }
- }
- return cl.kind;
-}
-
-typedef struct {
- int count;
-} MateTestClosure;
-
-extern void MateTestCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-MateTestCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register MateTestClosure *cl = (MateTestClosure *) closure;
-
- cl->count++;
-}
-
-/* Return MT_NONE, MT_CHECK, MT_CHECKMATE, or MT_STALEMATE */
-int
-MateTest (Board board, int flags)
-{
- MateTestClosure cl;
- int inCheck, r, f, myPieces=0, hisPieces=0, nrKing=0;
- ChessSquare king = flags & F_WHITE_ON_MOVE ? WhiteKing : BlackKing;
-
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) {
- // [HGM] losers: Count pieces and kings, to detect other unorthodox winning conditions
- nrKing += (board[r][f] == king); // stm has king
- if( board[r][f] != EmptySquare ) {
- if((int)board[r][f] <= (int)king && (int)board[r][f] >= (int)king - (int)WhiteKing + (int)WhitePawn)
- myPieces++;
- else hisPieces++;
- }
- }
- switch(gameInfo.variant) { // [HGM] losers: extinction wins
- case VariantShatranj:
- if(hisPieces == 1) return myPieces > 1 ? MT_BARE : MT_DRAW;
- default:
- break;
- case VariantAtomic:
- if(nrKing == 0) return MT_NOKING;
- break;
- case VariantLosers:
- if(myPieces == 1) return MT_BARE;
- }
- cl.count = 0;
- inCheck = GenLegal(board, flags, MateTestCallback, (VOIDSTAR) &cl, EmptySquare);
- // [HGM] 3check: yet to do!
- if (cl.count > 0) {
- return inCheck ? MT_CHECK : MT_NONE;
- } else {
- if(gameInfo.holdingsWidth && gameInfo.variant != VariantSuper && gameInfo.variant != VariantGreat
- && gameInfo.variant != VariantSChess && gameInfo.variant != VariantGrand) { // drop game
- int r, f, n, holdings = flags & F_WHITE_ON_MOVE ? BOARD_WIDTH-1 : 0;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++) if(board[r][f] == EmptySquare) // all empty squares
- for(n=0; n<BOARD_HEIGHT; n++) // all pieces in hand
- if(board[n][holdings] != EmptySquare) {
- int moveType = LegalDrop(board, flags, board[n][holdings], r, f);
- if(moveType == WhiteDrop || moveType == BlackDrop) return (inCheck ? MT_CHECK : MT_NONE); // we have legal drop
- }
- }
- if(gameInfo.variant == VariantSuicide) // [HGM] losers: always stalemate, since no check, but result varies
- return myPieces == hisPieces ? MT_STALEMATE :
- myPieces > hisPieces ? MT_STAINMATE : MT_STEALMATE;
- else if(gameInfo.variant == VariantLosers) return inCheck ? MT_TRICKMATE : MT_STEALMATE;
- else if(gameInfo.variant == VariantGiveaway) return MT_STEALMATE; // no check exists, stalemated = win
-
- return inCheck ? MT_CHECKMATE
- : (gameInfo.variant == VariantXiangqi || gameInfo.variant == VariantShatranj || IS_SHOGI(gameInfo.variant)) ?
- MT_STAINMATE : MT_STALEMATE;
- }
-}
-
-
-extern void DisambiguateCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-DisambiguateCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register DisambiguateClosure *cl = (DisambiguateClosure *) closure;
- int wildCard = FALSE; ChessSquare piece = board[rf][ff];
- extern int kifu; // in parser.c
-
- // [HGM] wild: for wild-card pieces rt and rf are dummies
- if(piece == WhiteFalcon || piece == BlackFalcon ||
- piece == WhiteCobra || piece == BlackCobra)
- wildCard = !pieceDefs; // no wildcards when engine defined pieces
-
- if ((cl->pieceIn == EmptySquare || cl->pieceIn == board[rf][ff]
- || PieceToChar(board[rf][ff]) == '~'
- && cl->pieceIn == (ChessSquare)(DEMOTED(board[rf][ff]))
- ) &&
- (cl->rfIn == -1 || cl->rfIn == rf) &&
- (cl->ffIn == -1 || cl->ffIn == ff) &&
- (cl->rtIn == -1 || cl->rtIn == rt || wildCard) &&
- (cl->ftIn == -1 || cl->ftIn == ft || wildCard)) {
-
- if(cl->count && rf == cl->rf && ff == cl->ff && rt == cl->rt && ft == cl->ft) return; // duplicate move
-
- if(cl->count == 1 && kifu & 0x7E && cl->rfIn == -1 && cl->ffIn == -1) { // traditional Shogi disambiguation required
- int this = 1, other = 1;
- if(kifu & 2) this &= (flags & 1 ? rt > rf : rt < rf), other &= (flags & 1 ? cl->rt > cl->rf : cl->rt < cl->rf);
- if(kifu & 4) this &= (flags & 1 ? rt < rf : rt > rf), other &= (flags & 1 ? cl->rt < cl->rf : cl->rt > cl->rf);
- if(kifu & 8) this &= (rf == rt), other &= (cl->rt == cl->rf);
- if(kifu & 0x10) this &= (flags & 1 ? ft <= ff : ft >= ff), other &= (flags & 1 ? cl->ft <= cl->ff : cl->ft >= cl->ff);
- if(kifu & 0x20) this &= (flags & 1 ? ft >= ff : ft <= ff), other &= (flags & 1 ? cl->ft >= cl->ff : cl->ft <= cl->ff);
- if(kifu & 0x40) this &= (ft == ff), other &= (cl->ft == cl->ff); // should never be used
- if(!other) cl->count--; // the old move did not satisfy the requested relative position, erase it
- if(!this) return; // the current move does not satisfy the requested relative position, ignore it
- }
-
- cl->count++;
- if(cl->count == 1 || board[rt][ft] != EmptySquare) {
- // [HGM] oneclick: if multiple moves, be sure we remember capture
- cl->piece = board[rf][ff];
- cl->rf = rf;
- cl->ff = ff;
- cl->rt = wildCard ? cl->rtIn : rt;
- cl->ft = wildCard ? cl->ftIn : ft;
- cl->kind = kind;
- }
- cl->captures += (board[rt][ft] != EmptySquare); // [HGM] oneclick: count captures
- }
-}
-
-void
-Disambiguate (Board board, int flags, DisambiguateClosure *closure)
-{
- int illegal = 0; char c = closure->promoCharIn;
-
- if(quickFlag) flags = flags & ~1 | quickFlag & 1; // [HGM] speed: in quick mode quickFlag specifies side-to-move.
- closure->count = closure->captures = 0;
- closure->rf = closure->ff = closure->rt = closure->ft = 0;
- closure->kind = ImpossibleMove;
- rFilter = closure->rtIn; // [HGM] speed: only consider moves to given to-square
- fFilter = closure->ftIn;
- if(quickFlag) { // [HGM] speed: try without check test first, because if that is not ambiguous, we are happy
- GenLegal(board, flags|F_IGNORE_CHECK, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn);
- if(closure->count > 1) { // gamble did not pay off. retry with check test to resolve ambiguity
- closure->count = closure->captures = 0;
- closure->rf = closure->ff = closure->rt = closure->ft = 0;
- closure->kind = ImpossibleMove;
- GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); // [HGM] speed: only pieces of requested type
- }
- } else
- GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn); // [HGM] speed: only pieces of requested type
- if (closure->count == 0) {
- /* See if it's an illegal move due to check */
- illegal = 1;
- GenLegal(board, flags|F_IGNORE_CHECK, DisambiguateCallback, (VOIDSTAR) closure, closure->pieceIn);
- if (closure->count == 0) {
- /* No, it's not even that */
- if(!appData.testLegality && !pieceDefs && closure->pieceIn != EmptySquare) {
- int f, r; // if there is only a single piece of the requested type on the board, use that
- closure->rt = closure->rtIn, closure->ft = closure->ftIn;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<BOARD_RGHT; f++)
- if(board[r][f] == closure->pieceIn) closure->count++, closure->rf = r, closure->ff = f;
- if(closure->count > 1) illegal = 0; // ambiguous
- }
- if(closure->count == 0) {
- if (appData.debugMode) { int i, j;
- for(i=BOARD_HEIGHT-1; i>=0; i--) {
- for(j=0; j<BOARD_WIDTH; j++)
- fprintf(debugFP, "%3d", (int) board[i][j]);
- fprintf(debugFP, "\n");
- }
- }
- return;
- }
- }
- } else if(pieceDefs && closure->count > 1 && closure->rtIn >=0) { // [HGM] gen: move is ambiguous under engine-defined rules (and not one-click)
- DisambiguateClosure spare = *closure;
- pieceDefs = FALSE; spare.count = 0; // See if the (erroneous) built-in rules would resolve that
- GenLegal(board, flags, DisambiguateCallback, (VOIDSTAR) &spare, closure->pieceIn);
- if(spare.count == 1) *closure = spare; // It does, so use those in stead (game from file saved before gen patch?)
- pieceDefs = TRUE;
- }
-
- if (c == 'x') c = NULLCHAR; // get rid of any 'x' (which should never happen?)
- if(gameInfo.variant == VariantSChess && c && c != '=' && closure->piece != WhitePawn && closure->piece != BlackPawn) {
- if(closure->piece < BlackPawn) { // white
- if(closure->rf != 0) closure->kind = IllegalMove; // must be on back rank
- if(!(board[VIRGIN][closure->ff] & VIRGIN_W)) closure->kind = IllegalMove; // non-virgin
- if(board[PieceToNumber(CharToPiece(ToUpper(c)))][BOARD_WIDTH-2] == 0) closure->kind = ImpossibleMove;// must be in stock
- if(closure->kind == WhiteHSideCastleFR && (closure->ff == BOARD_RGHT-2 || closure->ff == BOARD_RGHT-3)) closure->kind = ImpossibleMove;
- if(closure->kind == WhiteASideCastleFR && (closure->ff == BOARD_LEFT+2 || closure->ff == BOARD_LEFT+3)) closure->kind = ImpossibleMove;
- } else {
- if(closure->rf != BOARD_HEIGHT-1) closure->kind = IllegalMove;
- if(!(board[VIRGIN][closure->ff] & VIRGIN_B)) closure->kind = IllegalMove; // non-virgin
- if(board[BOARD_HEIGHT-1-PieceToNumber(CharToPiece(ToLower(c)))][1] == 0) closure->kind = ImpossibleMove;
- if(closure->kind == BlackHSideCastleFR && (closure->ff == BOARD_RGHT-2 || closure->ff == BOARD_RGHT-3)) closure->kind = ImpossibleMove;
- if(closure->kind == BlackASideCastleFR && (closure->ff == BOARD_LEFT+2 || closure->ff == BOARD_LEFT+3)) closure->kind = ImpossibleMove;
- }
- } else
- if(gameInfo.variant == VariantChu) {
- if(c == '+') closure->kind = (flags & F_WHITE_ON_MOVE ? WhitePromotion : BlackPromotion); // for now, accept any
- } else
- if(gameInfo.variant == VariantShogi) {
- /* [HGM] Shogi promotions. On input, '=' means defer, '+' promote. Afterwards, c is set to '+' for promotions, NULL other */
- if(closure->rfIn != DROP_RANK && closure->kind == NormalMove) {
- ChessSquare piece = closure->piece;
- int zone = BOARD_HEIGHT/3 + (BOARD_HEIGHT == 8);
- if (c == 'd' && (piece == WhiteRook || piece == BlackRook) ||
- c == 'h' && (piece == WhiteBishop || piece == BlackBishop) ||
- c == 'g' && (piece <= WhiteFerz || piece <= BlackFerz && piece >= BlackPawn) )
- c = '+'; // allowed ICS notations
- if(c != NULLCHAR && c != '+' && c != '=') closure->kind = IllegalMove; // otherwise specifying a piece is illegal
- else if(flags & F_WHITE_ON_MOVE) {
- if( (int) piece < (int) WhiteWazir &&
- (closure->rf >= BOARD_HEIGHT-zone || closure->rt >= BOARD_HEIGHT-zone) ) {
- if( (piece == WhitePawn || piece == WhiteQueen) && closure->rt > BOARD_HEIGHT-2 ||
- piece == WhiteKnight && closure->rt > BOARD_HEIGHT-3) /* promotion mandatory */
- closure->kind = c == '=' ? IllegalMove : WhitePromotion;
- else /* promotion optional, default is defer */
- closure->kind = c == '+' ? WhitePromotion : WhiteNonPromotion;
- } else closure->kind = c == '+' ? IllegalMove : NormalMove;
- } else {
- if( (int) piece < (int) BlackWazir && (closure->rf < zone || closure->rt < zone) ) {
- if( (piece == BlackPawn || piece == BlackQueen) && closure->rt < 1 ||
- piece == BlackKnight && closure->rt < 2 ) /* promotion obligatory */
- closure->kind = c == '=' ? IllegalMove : BlackPromotion;
- else /* promotion optional, default is defer */
- closure->kind = c == '+' ? BlackPromotion : BlackNonPromotion;
- } else closure->kind = c == '+' ? IllegalMove : NormalMove;
- }
- }
- if(closure->kind == WhitePromotion || closure->kind == BlackPromotion) c = '+'; else
- if(closure->kind == WhiteNonPromotion || closure->kind == BlackNonPromotion) c = '=';
- } else
- if (closure->kind == WhitePromotion || closure->kind == BlackPromotion) {
- if(c == NULLCHAR) { // missing promoChar on mandatory promotion; use default for variant
- if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier ||
- gameInfo.variant == VariantMakruk)
- c = PieceToChar(BlackFerz);
- else if(gameInfo.variant == VariantASEAN)
- c = PieceToChar(BlackRook);
- else if(gameInfo.variant == VariantGreat)
- c = PieceToChar(BlackMan);
- else if(gameInfo.variant == VariantGrand)
- closure->kind = closure->rt != 0 && closure->rt != BOARD_HEIGHT-1 ? NormalMove : AmbiguousMove; // no default in Grand Chess
- else
- c = PieceToChar(BlackQueen);
- } else if(c == '=') closure->kind = IllegalMove; // no deferral outside Shogi
- else if(c == 'l' && gameInfo.variant == VariantChuChess && HasLion(board, flags)) closure->kind = IllegalMove;
- } else if (c == '+') { // '+' outside shogi, check if pieceToCharTable enabled it
- ChessSquare p = closure->piece;
- if(p > WhiteMan && p < BlackPawn || p > BlackMan || PieceToChar(PROMOTED(p)) != '+')
- closure->kind = ImpossibleMove; // used on non-promotable piece
- else if(gameInfo.variant == VariantChuChess && HasLion(board, flags)) closure->kind = IllegalMove;
- } else if (c != NULLCHAR) closure->kind = IllegalMove;
-
- closure->promoChar = ToLower(c); // this can be NULLCHAR! Note we keep original promoChar even if illegal.
- if(c != '+' && c != '=' && c != NULLCHAR && CharToPiece(flags & F_WHITE_ON_MOVE ? ToUpper(c) : ToLower(c)) == EmptySquare)
- closure->kind = ImpossibleMove; // but we cannot handle non-existing piece types!
- if (closure->count > 1) {
- closure->kind = AmbiguousMove;
- }
- if (illegal) {
- /* Note: If more than one illegal move matches, but no legal
- moves, we return IllegalMove, not AmbiguousMove. Caller
- can look at closure->count to detect this.
- */
- closure->kind = IllegalMove;
- }
-}
-
-
-typedef struct {
- /* Input */
- ChessSquare piece;
- int rf, ff, rt, ft;
- /* Output */
- ChessMove kind;
- int rank;
- int file;
- int either;
-} CoordsToAlgebraicClosure;
-
-extern void CoordsToAlgebraicCallback P((Board board, int flags,
- ChessMove kind, int rf, int ff,
- int rt, int ft, VOIDSTAR closure));
-
-void
-CoordsToAlgebraicCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{
- register CoordsToAlgebraicClosure *cl =
- (CoordsToAlgebraicClosure *) closure;
-
- if ((rt == cl->rt && ft == cl->ft || rt == rf && ft == ff) && // [HGM] null move matches any toSquare
- (board[rf][ff] == cl->piece
- || PieceToChar(board[rf][ff]) == '~' &&
- (ChessSquare) (DEMOTED(board[rf][ff])) == cl->piece)
- ) {
- if (rf == cl->rf) {
- if (ff == cl->ff) {
- cl->kind = kind; /* this is the move we want */
- } else {
- cl->file++; /* need file to rule out this move */
- }
- } else {
- if (ff == cl->ff) {
- cl->rank++; /* need rank to rule out this move */
- } else {
- cl->either++; /* rank or file will rule out this move */
- }
- }
- }
-}
-
-/* Convert coordinates to normal algebraic notation.
- promoChar must be NULLCHAR or 'x' if not a promotion.
-*/
-ChessMove
-CoordsToAlgebraic (Board board, int flags, int rf, int ff, int rt, int ft, int promoChar, char out[MOVE_LEN])
-{
- ChessSquare piece;
- ChessMove kind;
- char *outp = out, c, capture;
- CoordsToAlgebraicClosure cl;
-
- if (rf == DROP_RANK) {
- if(ff == EmptySquare) { strncpy(outp, "--",3); return NormalMove; } // [HGM] pass
- /* Bughouse piece drop */
- *outp++ = ToUpper(PieceToChar((ChessSquare) ff));
- *outp++ = '@';
- *outp++ = ft + AAA;
- if(rt+ONE <= '9')
- *outp++ = rt + ONE;
- else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
- *outp = NULLCHAR;
- return (flags & F_WHITE_ON_MOVE) ? WhiteDrop : BlackDrop;
- }
-
- if (promoChar == 'x') promoChar = NULLCHAR;
- piece = board[rf][ff];
- if(PieceToChar(piece)=='~') piece = (ChessSquare)(DEMOTED(piece));
-
- switch (piece) {
- case WhitePawn:
- case BlackPawn:
- kind = LegalityTest(board, flags, rf, ff, rt, ft, promoChar);
- if (kind == IllegalMove && !(flags&F_IGNORE_CHECK)) {
- /* Keep short notation if move is illegal only because it
- leaves the player in check, but still return IllegalMove */
- kind = LegalityTest(board, flags|F_IGNORE_CHECK, rf, ff, rt, ft, promoChar);
- if (kind == IllegalMove) break;
- kind = IllegalMove;
- }
- /* Pawn move */
- *outp++ = ff + AAA;
- capture = board[rt][ft] != EmptySquare || kind == WhiteCapturesEnPassant || kind == BlackCapturesEnPassant;
- if (ff == ft && !capture) { /* [HGM] Xiangqi has straight noncapts! */
- /* Non-capture; use style "e5" */
- if(rt+ONE <= '9')
- *outp++ = rt + ONE;
- else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
- } else {
- /* Capture; use style "exd5" */
- if(capture)
- *outp++ = 'x'; /* [HGM] Xiangqi has sideway noncaptures across river! */
- *outp++ = ft + AAA;
- if(rt+ONE <= '9')
- *outp++ = rt + ONE;
- else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
- }
- /* Use promotion suffix style "=Q" */
- *outp = NULLCHAR;
- if (promoChar != NULLCHAR) {
- if(IS_SHOGI(gameInfo.variant)) {
- /* [HGM] ... but not in Shogi! */
- *outp++ = promoChar == '=' ? '=' : '+';
- } else {
- *outp++ = '=';
- *outp++ = ToUpper(promoChar);
- }
- *outp = NULLCHAR;
- }
- return kind;
-
-
- case WhiteKing:
- case BlackKing:
- /* Fabien moved code: FRC castling first (if KxR), wild castling second */
- /* Code added by Tord: FRC castling. */
- if((piece == WhiteKing && board[rt][ft] == WhiteRook) ||
- (piece == BlackKing && board[rt][ft] == BlackRook)) {
- if(ft > ff)
- safeStrCpy(out, "O-O", MOVE_LEN);
- else
- safeStrCpy(out, "O-O-O", MOVE_LEN);
- return LegalityTest(board, flags, rf, ff, rt, ft, promoChar);
- }
- /* End of code added by Tord */
- /* Test for castling or ICS wild castling */
- /* Use style "O-O" (oh-oh) for PGN compatibility */
- else if (rf == rt &&
- rf == ((piece == WhiteKing) ? 0 : BOARD_HEIGHT-1) &&
- (ft - ff > 1 || ff - ft > 1) && // No castling if legal King move (on narrow boards!)
- ((ff == BOARD_WIDTH>>1 && (ft == BOARD_LEFT+2 || ft == BOARD_RGHT-2)) ||
- (ff == (BOARD_WIDTH-1)>>1 && (ft == BOARD_LEFT+1 || ft == BOARD_RGHT-3)))) {
- if(ft==BOARD_LEFT+1 || ft==BOARD_RGHT-2)
- snprintf(out, MOVE_LEN, "O-O%c%c", promoChar ? '/' : 0, ToUpper(promoChar));
- else
- snprintf(out, MOVE_LEN, "O-O-O%c%c", promoChar ? '/' : 0, ToUpper(promoChar));
-
- /* This notation is always unambiguous, unless there are
- kings on both the d and e files, with "wild castling"
- possible for the king on the d file and normal castling
- possible for the other. ICS rules for wild 9
- effectively make castling illegal for either king in
- this situation. So I am not going to worry about it;
- I'll just generate an ambiguous O-O in this case.
- */
- return LegalityTest(board, flags, rf, ff, rt, ft, promoChar);
- }
-
- /* else fall through */
- default:
- /* Piece move */
- cl.rf = rf;
- cl.ff = ff;
- cl.rt = rFilter = rt; // [HGM] speed: filter on to-square
- cl.ft = fFilter = ft;
- cl.piece = piece;
- cl.kind = IllegalMove;
- cl.rank = cl.file = cl.either = 0;
- c = PieceToChar(piece) ;
- GenLegal(board, flags, CoordsToAlgebraicCallback, (VOIDSTAR) &cl, c!='~' ? piece : (DEMOTED(piece))); // [HGM] speed
-
- if (cl.kind == IllegalMove && !(flags&F_IGNORE_CHECK)) {
- /* Generate pretty moves for moving into check, but
- still return IllegalMove.
- */
- GenLegal(board, flags|F_IGNORE_CHECK, CoordsToAlgebraicCallback, (VOIDSTAR) &cl, c!='~' ? piece : (DEMOTED(piece)));
- if (cl.kind == IllegalMove) break;
- cl.kind = IllegalMove;
- }
-
- /* Style is "Nf3" or "Nxf7" if this is unambiguous,
- else "Ngf3" or "Ngxf7",
- else "N1f3" or "N5xf7",
- else "Ng1f3" or "Ng5xf7".
- */
- if( c == '~' || c == '+') {
- /* [HGM] print nonexistent piece as its demoted version */
- piece = (ChessSquare) (CHUDEMOTED(piece));
- }
- if(c=='+') *outp++ = c;
- *outp++ = ToUpper(PieceToChar(piece));
- if(*outp = PieceSuffix(piece)) outp++;
-
- if (cl.file || (cl.either && !cl.rank)) {
- *outp++ = ff + AAA;
- }
- if (cl.rank) {
- if(rf+ONE <= '9')
- *outp++ = rf + ONE;
- else { *outp++ = (rf+ONE-'0')/10 + '0';*outp++ = (rf+ONE-'0')%10 + '0'; }
- }
-
- if(board[rt][ft] != EmptySquare)
- *outp++ = 'x';
-
- *outp++ = ft + AAA;
- if(rt+ONE <= '9')
- *outp++ = rt + ONE;
- else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
- if (IS_SHOGI(gameInfo.variant)) {
- /* [HGM] in Shogi non-pawns can promote */
- *outp++ = promoChar; // Don't bother to correct move type, return value is never used!
- }
- else if (gameInfo.variant == VariantChuChess && promoChar ||
- gameInfo.variant != VariantSuper && promoChar &&
- (piece == WhiteLance || piece == BlackLance) ) { // Lance sometimes represents Pawn
- *outp++ = '=';
- *outp++ = ToUpper(promoChar);
- }
- else if (gameInfo.variant == VariantSChess && promoChar) { // and in S-Chess we have gating
- *outp++ = '/';
- *outp++ = ToUpper(promoChar);
- }
- *outp = NULLCHAR;
- return cl.kind;
-
- case EmptySquare:
- /* Moving a nonexistent piece */
- break;
- }
-
- /* Not a legal move, even ignoring check.
- If there was a piece on the from square,
- use style "Ng1g3" or "Ng1xe8";
- if there was a pawn or nothing (!),
- use style "g1g3" or "g1xe8". Use "x"
- if a piece was on the to square, even
- a piece of the same color.
- */
- outp = out;
- c = 0;
- if (piece != EmptySquare && piece != WhitePawn && piece != BlackPawn) {
- int r, f;
- for(r=0; r<BOARD_HEIGHT; r++) for(f=BOARD_LEFT; f<=BOARD_RGHT; f++)
- c += (board[r][f] == piece); // count on-board pieces of given type
- *outp = PieceToChar(piece);
- if(*outp == '+') outp++, piece = CHUDEMOTED(piece);
- *outp++ = ToUpper(PieceToChar(piece));
- if(*outp = PieceSuffix(piece)) outp++;
- }
- if(c != 1) { // [HGM] but if there is only one piece of the mentioned type, no from-square, thank you!
- *outp++ = ff + AAA;
- if(rf+ONE <= '9')
- *outp++ = rf + ONE;
- else { *outp++ = (rf+ONE-'0')/10 + '0';*outp++ = (rf+ONE-'0')%10 + '0'; }
- }
- if (board[rt][ft] != EmptySquare) *outp++ = 'x';
- *outp++ = ft + AAA;
- if(rt+ONE <= '9')
- *outp++ = rt + ONE;
- else { *outp++ = (rt+ONE-'0')/10 + '0';*outp++ = (rt+ONE-'0')%10 + '0'; }
- /* Use promotion suffix style "=Q" */
- if (promoChar != NULLCHAR && promoChar != 'x') {
- *outp++ = '=';
- *outp++ = ToUpper(promoChar);
- }
- *outp = NULLCHAR;
-
- return IllegalMove;
-}
-
-// [HGM] XQ: the following code serves to detect perpetual chasing (Asian rules)
-
-typedef struct {
- /* Input */
- int rf, ff, rt, ft;
- /* Output */
- int recaptures;
-} ChaseClosure;
-
-// I guess the following variables logically belong in the closure too, but I was too lazy and used globals
-
-int preyStackPointer, chaseStackPointer;
-
-struct {
-unsigned char rf, ff, rt, ft;
-} chaseStack[100];
-
-struct {
-unsigned char rank, file;
-} preyStack[100];
-
-
-
-
-// there are three new callbacks for use with GenLegal: for adding captures, deleting them, and finding a recapture
-
-extern void AtacksCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-AttacksCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{ // For adding captures that can lead to chase indictment to the chaseStack
- if(board[rt][ft] == EmptySquare) return; // non-capture
- if(board[rt][ft] == WhitePawn && rt < BOARD_HEIGHT/2) return; // Pawn before river can be chased
- if(board[rt][ft] == BlackPawn && rt >= BOARD_HEIGHT/2) return; // Pawn before river can be chased
- if(board[rf][ff] == WhitePawn || board[rf][ff] == BlackPawn) return; // Pawns are allowed to chase
- if(board[rf][ff] == WhiteWazir || board[rf][ff] == BlackWazir) return; // King is allowed to chase
- // move cannot be excluded from being a chase trivially (based on attacker and victim); save it on chaseStack
- chaseStack[chaseStackPointer].rf = rf;
- chaseStack[chaseStackPointer].ff = ff;
- chaseStack[chaseStackPointer].rt = rt;
- chaseStack[chaseStackPointer].ft = ft;
- chaseStackPointer++;
-}
-
-extern void ExistingAtacksCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-ExistingAttacksCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{ // for removing pre-exsting captures from the chaseStack, to be left with newly created ones
- int i;
- register ChaseClosure *cl = (ChaseClosure *) closure; //closure tells us the move played in the repeat loop
-
- if(board[rt][ft] == EmptySquare) return; // no capture
- if(rf == cl->rf && ff == cl->ff) { // attacks with same piece from new position are not considered new
- rf = cl->rt; ff = cl->ft; // doctor their fromSquare so they will be recognized in chaseStack
- }
- // search move in chaseStack, and delete it if it occurred there (as we know now it is not a new capture)
- for(i=0; i<chaseStackPointer; i++) {
- if(chaseStack[i].rf == rf && chaseStack[i].ff == ff &&
- chaseStack[i].rt == rt && chaseStack[i].ft == ft ) {
- // move found on chaseStack, delete it by overwriting with move popped from top of chaseStack
- chaseStack[i] = chaseStack[--chaseStackPointer];
- break;
- }
- }
-}
-
-extern void ProtectedCallback P((Board board, int flags, ChessMove kind,
- int rf, int ff, int rt, int ft,
- VOIDSTAR closure));
-
-void
-ProtectedCallback (Board board, int flags, ChessMove kind, int rf, int ff, int rt, int ft, VOIDSTAR closure)
-{ // for determining if a piece (given through the closure) is protected
- register ChaseClosure *cl = (ChaseClosure *) closure; // closure tells us where to recapture
-
- if(rt == cl->rt && ft == cl->ft) cl->recaptures++; // count legal recaptures to this square
- if(appData.debugMode && board[rt][ft] != EmptySquare)
- fprintf(debugFP, "try %c%c%c%c=%d\n", ff+AAA, rf+ONE,ft+AAA, rt+ONE, cl->recaptures);
-}
-
-extern char moveList[MAX_MOVES][MOVE_LEN];
-
-int
-PerpetualChase (int first, int last)
-{ // this routine detects if the side to move in the 'first' position is perpetually chasing (when not checking)
- int i, j, k, tail;
- ChaseClosure cl;
- ChessSquare captured;
-
- preyStackPointer = 0; // clear stack of chased pieces
- for(i=first; i<last; i+=2) { // for all positions with same side to move
- if(appData.debugMode) fprintf(debugFP, "judge position %i\n", i);
- chaseStackPointer = 0; // clear stack that is going to hold possible chases
- // determine all captures possible after the move, and put them on chaseStack
- GenLegal(boards[i+1], PosFlags(i), AttacksCallback, &cl, EmptySquare);
- if(appData.debugMode) { int n;
- for(n=0; n<chaseStackPointer; n++)
- fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
- chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
- fprintf(debugFP, ": all capts\n");
- }
- // determine all captures possible before the move, and delete them from chaseStack
- cl.rf = moveList[i][1]-ONE; // prepare closure to pass move that led from i to i+1
- cl.ff = moveList[i][0]-AAA+BOARD_LEFT;
- cl.rt = moveList[i][3]-ONE;
- cl.ft = moveList[i][2]-AAA+BOARD_LEFT;
- CopyBoard(xqCheckers, nullBoard); xqCheckers[EP_STATUS] = 1; // giant kludge to make GenLegal ignore pre-existing checks
- GenLegal(boards[i], PosFlags(i), ExistingAttacksCallback, &cl, EmptySquare);
- xqCheckers[EP_STATUS] = 0; // disable the generation of quasi-legal moves again
- if(appData.debugMode) { int n;
- for(n=0; n<chaseStackPointer; n++)
- fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
- chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
- fprintf(debugFP, ": new capts after %c%c%c%c\n", cl.ff+AAA, cl.rf+ONE, cl.ft+AAA, cl.rt+ONE);
- }
- // chaseSack now contains all captures made possible by the move
- for(j=0; j<chaseStackPointer; j++) { // run through chaseStack to identify true chases
- int attacker = (int)boards[i+1][chaseStack[j].rf][chaseStack[j].ff];
- int victim = (int)boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
-
- if(attacker >= (int) BlackPawn) attacker = BLACK_TO_WHITE attacker; // convert to white, as piecee type
- if(victim >= (int) BlackPawn) victim = BLACK_TO_WHITE victim;
-
- if((attacker == WhiteKnight || attacker == WhiteCannon) && victim == WhiteRook)
- continue; // C or H attack on R is always chase; leave on chaseStack
-
- if(attacker == victim) {
- if(LegalityTest(boards[i+1], PosFlags(i+1), chaseStack[j].rt,
- chaseStack[j].ft, chaseStack[j].rf, chaseStack[j].ff, NULLCHAR) == NormalMove) {
- // we can capture back with equal piece, so this is no chase but a sacrifice
- chaseStack[j] = chaseStack[--chaseStackPointer]; // delete the capture from the chaseStack
- j--; /* ! */ continue;
- }
-
- }
-
- // the attack is on a lower piece, or on a pinned or blocked equal one
- CopyBoard(xqCheckers, nullBoard); xqCheckers[EP_STATUS] = 1;
- CheckTest(boards[i+1], PosFlags(i+1), -1, -1, -1, -1, FALSE); // if we deliver check with our move, the checkers get marked
- // test if the victim is protected by a true protector. First make the capture.
- captured = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
- boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = boards[i+1][chaseStack[j].rf][chaseStack[j].ff];
- boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = EmptySquare;
- // Then test if the opponent can recapture
- cl.recaptures = 0; // prepare closure to pass recapture square and count moves to it
- cl.rt = chaseStack[j].rt;
- cl.ft = chaseStack[j].ft;
- if(appData.debugMode) {
- fprintf(debugFP, "test if we can recapture %c%c\n", cl.ft+AAA, cl.rt+ONE);
- }
- xqCheckers[EP_STATUS] = 2; // causes GenLegal to ignore the checks we delivered with the move, in real life evaded before we captured
- GenLegal(boards[i+1], PosFlags(i+1), ProtectedCallback, &cl, EmptySquare); // try all moves
- xqCheckers[EP_STATUS] = 0; // disable quasi-legal moves again
- // unmake the capture
- boards[i+1][chaseStack[j].rf][chaseStack[j].ff] = boards[i+1][chaseStack[j].rt][chaseStack[j].ft];
- boards[i+1][chaseStack[j].rt][chaseStack[j].ft] = captured;
- // if a recapture was found, piece is protected, and we are not chasing it.
- if(cl.recaptures) { // attacked piece was defended by true protector, no chase
- chaseStack[j] = chaseStack[--chaseStackPointer]; // so delete from chaseStack
- j--; /* ! */
- }
- }
- // chaseStack now contains all moves that chased
- if(appData.debugMode) { int n;
- for(n=0; n<chaseStackPointer; n++)
- fprintf(debugFP, "%c%c%c%c ", chaseStack[n].ff+AAA, chaseStack[n].rf+ONE,
- chaseStack[n].ft+AAA, chaseStack[n].rt+ONE);
- fprintf(debugFP, ": chases\n");
- }
- if(i == first) { // copy all people chased by first move of repeat cycle to preyStack
- for(j=0; j<chaseStackPointer; j++) {
- preyStack[j].rank = chaseStack[j].rt;
- preyStack[j].file = chaseStack[j].ft;
- }
- preyStackPointer = chaseStackPointer;
- }
- tail = 0;
- for(j=0; j<chaseStackPointer; j++) {
- for(k=0; k<preyStackPointer; k++) {
- // search the victim of each chase move on the preyStack (first occurrence)
- if(chaseStack[j].ft == preyStack[k].file && chaseStack[j].rt == preyStack[k].rank ) {
- if(k < tail) break; // piece was already identified as still being chased
- preyStack[preyStackPointer] = preyStack[tail]; // move chased piece to bottom part of preyStack
- preyStack[tail] = preyStack[k]; // by swapping
- preyStack[k] = preyStack[preyStackPointer];
- tail++;
- break;
- }
- }
- }
- preyStackPointer = tail; // keep bottom part of preyStack, popping pieces unchased on move i.
- if(appData.debugMode) { int n;
- for(n=0; n<preyStackPointer; n++)
- fprintf(debugFP, "%c%c ", preyStack[n].file+AAA, preyStack[n].rank+ONE);
- fprintf(debugFP, "always chased upto ply %d\n", i);
- }
- // now adjust the location of the chased pieces according to opponent move
- for(j=0; j<preyStackPointer; j++) {
- if(preyStack[j].rank == moveList[i+1][1]-ONE &&
- preyStack[j].file == moveList[i+1][0]-AAA+BOARD_LEFT) {
- preyStack[j].rank = moveList[i+1][3]-ONE;
- preyStack[j].file = moveList[i+1][2]-AAA+BOARD_LEFT;
- break;
- }
- }
- }
- return preyStackPointer ? 256*(preyStack[preyStackPointer].file - BOARD_LEFT + AAA) + (preyStack[preyStackPointer].rank + ONE)
- : 0; // if any piece was left on preyStack, it has been perpetually chased,and we return the
-}
projects / xboard.git / blobdiff