Prevent multi-path moves from parsing as ambiguous

In Cylinder Chess the MovesFromString() generator might generate duplicate
moves, one wrapping, the other direct. When they were both counted as
matching the SAN input move, Disambiguate() would think it an ambiguous
move. So a move that came from the same square as the one we already
have must not be counted.

diff --git a/moves.c b/moves.c
index a3eebcc..29638b8 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -1815,6 +1815,8 @@ DisambiguateCallback (Board board, int flags, ChessMove kind, int rf, int ff, in
        (cl->rtIn == -1 || cl->rtIn == rt || wildCard) &&
        (cl->ftIn == -1 || cl->ftIn == ft || wildCard)) {
 
+       if(cl->count && rf == cl->rf && ff == cl->ff) return; // duplicate move
+
        cl->count++;
        if(cl->count == 1 || board[rt][ft] != EmptySquare) {
          // [HGM] oneclick: if multiple moves, be sure we remember capture