Define moves for Dragon Horse outside Shogi

Let it move like Bishop + Wazir + Dababba.

diff --git a/moves.c b/moves.c
index 331840e..4df7d42 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -428,6 +428,18 @@ void GenPseudoLegal(board, flags, callback, closure)
                  }
                 break;
 
+            /* Make Dragon-Horse also do Dababba moves outside Shogi, for better disambiguation in variant Fairy */
+           case WhiteCardinal:
+           case BlackCardinal:
+              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: