X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=parser.l;h=392b5b256d59619c09ff14bd3be187967442eca0;hb=50834a5d1deb1fa3f3edd73c61be0e55b89a637d;hp=061d6ca86f5911e8ccae3f7ffc7df89e28672345;hpb=f3a68fb378aa91c6e4b3f54fb875074888a07180;p=xboard.git

diff --git a/parser.l b/parser.l
index 061d6ca..392b5b2 100644
--- a/parser.l
+++ b/parser.l
@@ -12,7 +12,7 @@
  * Massachusetts.
  *
  * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005,
- * 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ * 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
  *
  * The following terms apply to Digital Equipment Corporation's copyright
  * interest in XBoard:
@@ -845,6 +845,8 @@ extern void CopyBoard P((Board to, Board from));
     } else {
 	currentMoveString[0] = ToLower(yytext[0]);
     }
+    if(CharToPiece(currentMoveString[0]) == EmptySquare) return ImpossibleMove; // Unknown piece;
+
     return LegalityTest(boards[yyboardindex], PosFlags(yyboardindex), DROP_RANK, // [HGM] does drops now too
                         CharToPiece(currentMoveString[0]), currentMoveString[3] - ONE, currentMoveString[2] - AAA, NULLCHAR);
 }