Update variants.ini

src/variants.ini

@@ -126,6 +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(**);
 # [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]
@@ -222,6 +223,9 @@
 # enclosingDropStart: drop region for starting phase disregarding enclosingDrop (e.g., for reversi) [Bitboard]
 # whiteDropRegion: restrict region for piece drops of all white pieces [Bitboard]
 # blackDropRegion: restrict region for piece drops of all black pieces [Bitboard]
+# pieceSpecificDropRegion: whether to enable drop region per piece type restriction [bool]
+# whitePieceDropRegion: the drop region of each piece for white which is under whiteDropRegion restriction [PieceTypeBitboardGroup]
+# blackPieceDropRegion: the drop region of each piece for black which is under blackDropRegion restriction [PieceTypeBitboardGroup]
 # sittuyinRookDrop: restrict region of rook drops to first rank [bool] (default: false)
 # dropOppositeColoredBishop: dropped bishops have to be on opposite-colored squares [bool] (default: false)
 # dropPromoted: pieces may be dropped in promoted state [bool] (default: false)