From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Mon, 22 Nov 2010 11:52:02 +0000 (+0100)
Subject: Allow RxK notation for entering castling
X-Git-Tag: 4.8Q~7
X-Git-Url: http://winboard.nl/cgi-bin?p=fairymax.git;a=commitdiff_plain;h=4b753a4ed5a531703e7456cb92f21b9a0f46b4e3

Allow RxK notation for entering castling

This notation is detected on input, and translated to the corresponding
King move, where the to-square is derved from the entered 'Rook'
position, so that capturing with wrongly positioned pieces would be
rejected as illegal. (They might be accepted as normal King moves,
though.)
---

diff --git a/fairymax.c b/fairymax.c
index ce2d7ae..7fb3cad 100644
--- a/fairymax.c
+++ b/fairymax.c
@@ -859,14 +859,18 @@ 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=K;
+                    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; }
+                    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 */
                         GameHistory[GamePtr++] = PACK_MOVE;
                         Side ^= BLACK^WHITE;
                         CopyBoard(HistPtr=HistPtr+1&1023);
                         if(PrintResult(Side)) Computer = EMPTY;
+		    }
 		}
 	}
 }