X-Git-Url: http://winboard.nl/cgi-bin?p=capablanca.git;a=blobdiff_plain;f=lasker-2.2.3%2Fsrc%2Fmovecheck.c;h=e9b3a15ffe7b613f692877e32e176918c6f586f5;hp=d5759154cb926a53aca30f63e39db6470da8a99c;hb=e86b01cc0e1895b6af910235178344bc898874ef;hpb=76a192175f31fcb85ba99e354916dd78b9e5850e

diff --git a/lasker-2.2.3/src/movecheck.c b/lasker-2.2.3/src/movecheck.c
index d575915..e9b3a15 100644
--- a/lasker-2.2.3/src/movecheck.c
+++ b/lasker-2.2.3/src/movecheck.c
@@ -1710,7 +1710,7 @@ static int move_calculate(struct game_state_t * gs, struct move_t * mt, int prom
     for (i = g->numHalfMoves-1; i >= 0; i--) {
       if (g->moveList[i].fromFile == mt->fromFile && g->moveList[i].fromRank == mt->fromRank ||
           g->moveList[i].toFile   == mt->fromFile && g->moveList[i].toRank   == mt->fromRank ||
-	  g->moveList[i].fromFile == ALG_CASTLE && (gs->onMove == WHITE ? 0 : gs->ranks-1) == mt->fromRank &&
+	  g->moveList[i].fromFile == ALG_CASTLE && (i&1 ? gs->ranks-1 : 0) == mt->fromRank &&
 		 (g->moveList[i].fromRank == mt->fromFile || gs->files>>1 == mt->fromFile )) return MOVE_ILLEGAL;
     }
     mt->piecePromotionTo = promote; // gating OK