Fix support for no square

src/types.h

@@ -239,10 +239,10 @@ struct PieceTypeBitboardGroup
     {
         size_t i;
         this->boardlist = (Bitboard*)malloc(PIECE_TYPE_COUNT * sizeof(Bitboard));
-        // By default, all squares are allowed for all pieces.
+        // By default, all bits are ZERO for all pieces.
         for (i = 0; i < PIECE_TYPE_COUNT; i++)
         {
-            this->boardlist[i] ^= ~this->boardlist[i];
+            this->boardlist[i] ^= this->boardlist[i];
         }
     }
 

src/variants.ini

@@ -126,7 +126,7 @@
 # [PieceSet]: multiple piece types [letters defined for pieces, e.g., nbrq]
 # [CastlingRights]: set of castling rights [letters for castling rights as in FEN, e.g., KQkq]
 # [Bitboard]: list of squares [e.g., d4 e4 d5 e5]. * can be used as wildcard for files (e.g., *1 is the first rank)
-# [PieceTypeBitboardGroup]: list of squares for different pieces. * can be used as wildcard for files and ranks (e.g., *1 is the first rank, ** means everywhere, a* means file a). The syntax is [<piece char (in upper case)>(<location[, ...]>); [...]]. Pieces not specified are equivalent to "<not specified piece char>(**);". Example: P(e4,*1);Q(a1,a2,b*);K(**);
+# [PieceTypeBitboardGroup]: list of squares for different pieces. * can be used as wildcard for files and ranks (e.g., *1 is the first rank, ** means everywhere, a* means file a). The syntax is [<piece char (in upper case)>(<location[, ...]>); [...]]. Pieces not specified have no square. Example: P(e4,*1);Q(a1,a2,b*);K(**);
 # [Value]: game result for the side to move [win, loss, draw]
 # [MaterialCounting]: material counting rules for adjudication [janggi, unweighted, whitedrawodds, blackdrawodds, none]
 # [CountingRule]: makruk, cambodian, or ASEAN counting rules [makruk, cambodian, asean, none]