Fix deferral

Pieces that could promote would not be allowed to defer. Which is OK for
Crazyhouse, but not for Shogi. Now only pieces that have the must-promote
ormust-promote-one-last-2-ranks flags set get their promotion suppressed
where these flags request it.

diff --git a/dropper.c b/dropper.c
index adcd956..d229f91 100644 (file)
--- a/dropper.c
+++ b/dropper.c
@@ -805,7 +805,7 @@ MoveGen (int stm, MoveStack *m, int castle)
                    if((victim & ~COLOR) == 31) return 1; // captures King; abort!
                    move = piece << 16;   // store piece in move
                    promote = (inZone | zoneTab[to]) & promoCode[piece-WHITE];
-                   if((promote & (Z_2ND | Z_MUST )) == 0) { // not in place where deferral forbidden
+                   if((promote & ((Z_2ND | Z_MUST ) & ~COLOR)) == 0) { // not in place where deferral forbidden
                        int slot;
                        if(victim) { // capture
                            slot = --m->firstMove;