X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=fairymax.c;h=0f4dd5f62f69d8c37dd4b43481fd4790582f0ef1;hb=178720867b5f21ece6bde4502d0d249f532f6a7f;hp=7fb3cadb6fbf52b86541f5ff1d381c118b9a4c93;hpb=4b753a4ed5a531703e7456cb92f21b9a0f46b4e3;p=fairymax.git

diff --git a/fairymax.c b/fairymax.c
index 7fb3cad..0f4dd5f 100644
--- a/fairymax.c
+++ b/fairymax.c
@@ -859,13 +859,14 @@ int main(int argc, char **argv)
                 if (m)
                         /* doesn't have move syntax */
 			printf("Error (unknown command): %s\n", command);
-                else { int i=K;
+                else { int i=-1;
                     if(b[L] && (b[L]&16) == Side && w[b[L]&15] < 0) // capture own King: castling
-                    { K = L; L = i>L ? i-1 : i+2; }
+                    { i=K; K = L; L = i>L ? i-1 : i+2; }
                     if(D(Side,-I,I,Q,O,LL|S,3)!=I) {
                         /* did have move syntax, but illegal move */
                         printf("Illegal move:%s\n", line);
-                    } else {  /* legal move, perform it */
+                    } else {  /* legal move, perform it */
+                        if(i >= 0) b[i]=b[K],b[K]=0; // reverse Seirawan gating
                         GameHistory[GamePtr++] = PACK_MOVE;
                         Side ^= BLACK^WHITE;
                         CopyBoard(HistPtr=HistPtr+1&1023);