Suppress spurious use of SAN castling in mini variants

King moves from a central file to the king-side-castled position (1
square away from the right corner) were intercepted and printed as O-O
in CoordsToAlgebraic. But on a 5x5 board (mini-Shogi!) this caught the
normal King move Kc1-d1 as well. The castling notation is now reserved
for King moves larger than one step.

diff --git a/moves.c b/moves.c
index 2069b9d..2e8d672 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -1521,6 +1521,7 @@ ChessMove CoordsToAlgebraic(board, flags, rf, ff, rt, ft, promoChar, out)
        /* 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)