X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=fairymax.c;h=0f4dd5f62f69d8c37dd4b43481fd4790582f0ef1;hb=178720867b5f21ece6bde4502d0d249f532f6a7f;hp=ce2d7ae4e2eea85d5bfebc5ee51622235824ae48;hpb=cdb80be80d2895990ffe4b3f88ab566e5553ca3c;p=fairymax.git

diff --git a/fairymax.c b/fairymax.c
index ce2d7ae..0f4dd5f 100644
--- a/fairymax.c
+++ b/fairymax.c
@@ -859,14 +859,19 @@ int main(int argc, char **argv)
                 if (m)
                         /* doesn't have move syntax */
 			printf("Error (unknown command): %s\n", command);
-                else if(D(Side,-I,I,Q,O,LL|S,3)!=I) {
+                else { int i=-1;
+                    if(b[L] && (b[L]&16) == Side && w[b[L]&15] < 0) // capture own King: castling
+                    { 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);
                         if(PrintResult(Side)) Computer = EMPTY;
+		    }
 		}
 	}
 }