From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Fri, 3 Apr 2020 20:05:23 +0000 (+0200)
Subject: Consider palace moves in evaluation
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=346fb60a4252eaaf12f200aa6ddbc083bb7e977b;p=fairystockfish.git

Consider palace moves in evaluation

janggi
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 292 W: 178 L: 82 D: 32
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index f311b14..58a7c27 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -300,6 +300,18 @@ namespace {
           : Pt ==   ROOK ? attacks_bb<  ROOK>(s, pos.pieces() ^ pos.pieces(QUEEN) ^ pos.pieces(Us, ROOK))
                          : pos.attacks_from(Us, Pt, s);
 
+        // Janggi palace moves
+        if (pos.diagonal_lines() & s)
+        {
+            PieceType diagType = Pt == WAZIR ? FERS : Pt == SOLDIER ? PAWN : Pt == ROOK ? BISHOP : NO_PIECE_TYPE;
+            if (diagType)
+                b |= attacks_bb(Us, diagType, s, pos.pieces()) & pos.board_bb(Us, Pt) & pos.diagonal_lines();
+            else if (Pt == JANGGI_CANNON)
+                // TODO: fix for longer diagonals
+                b |= attacks_bb(Us, ALFIL, s, pos.pieces()) & ~attacks_bb(Us, ELEPHANT, s, pos.pieces() ^ pos.pieces(JANGGI_CANNON))
+                    & pos.board_bb(Us, Pt) & pos.diagonal_lines();
+        }
+
         // Restrict mobility to actual squares of board
         b &= pos.board_bb();