Use ii in Betza notation for 3rd-rank Pawn push

The 'i' modifier specifies the move is only for virgin pieces. We now
use 'ii' to indicate a move that can be made when the piece is standing
on the square in front of that were such a piece starts in the initial
setup. This is intended for Pawns that can still be pushed extra far
after they have made a first single step, such as in Wildebeest Chess,
where pawns on 2nd rank can move 1, 2 or 3 squares ahead, and on 3rd rank
can still move 1 or 2 (fmWifmW3iifmW2).

diff --git a/moves.c b/moves.c
index 1e9ba9e..0144486 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -287,7 +287,7 @@ MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle
     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;
-       if(*p == 'i') initial = 1, desc = ++p;
+       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
@@ -372,6 +372,7 @@ MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle
        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; } else
        if(initial && (board[r][f] != initialPosition[r][f] ||
                       r == 0              && board[TOUCHED_W] & 1<<f ||
                       r == BOARD_HEIGHT-1 && board[TOUCHED_B] & 1<<f   ) ) continue;