/// <summary>
/// 与えられた指し手に従い、局面を更新する。
/// </summary>
/// <param name="move"></param>
public void DoMove(Move move)
{
Debug.Assert(SideToMove == move.SideToMove);
Debug.Assert(move.Drop || Board[move.FileFrom, move.RankFrom] == move.PieceFrom);
Debug.Assert(move.Drop || Board[move.FileTo, move.RankTo] == move.PieceTo);
// 相手の駒を取る
if (move.PieceTo != Piece.NoPiece)
{
RemovePiece(move.FileTo, move.RankTo);
Debug.Assert(move.PieceTo.ToColor() != SideToMove);
Debug.Assert(move.PieceTo.AsOpponentHandPiece().ToColor() == SideToMove);
PutHandPiece(move.PieceTo.AsOpponentHandPiece());
}
if (move.Drop)
{
// 駒を打つ指し手
Debug.Assert(move.PieceFrom.ToColor() == SideToMove);
RemoveHandPiece(move.PieceFrom);
}
else
{
// 駒を移動する指し手
RemovePiece(move.FileFrom, move.RankFrom);
}
PutPiece(move.FileTo, move.RankTo,
move.Promotion
? move.PieceFrom.AsPromoted()
: move.PieceFrom);
Debug.Assert(Board[move.FileTo, move.RankTo].ToColor() == SideToMove);
SideToMove = SideToMove.ToOpponent();
Hash ^= Zobrist.Instance.Side;
if (move.PieceFrom == Piece.BlackKing)
{
BlackKingFile = move.FileTo;
BlackKingRank = move.RankTo;
}
else if (move.PieceFrom == Piece.WhiteKing)
{
WhiteKingFile = move.FileTo;
WhiteKingRank = move.RankTo;
}
++Play;
LastMove = move;
var newState = new PositionState();
newState.Previous = State;
State = newState;
}
/// <summary>
/// sfen文字列をセットする
/// </summary>
/// <param name="sfen"></param>
public void Set(string sfen)
{
SideToMove = Color.Black;
Array.Clear(Board, 0, Board.Length);
Array.Clear(HandPieces, 0, HandPieces.Length);
Play = 1;
Hash = 0;
BlackKingFile = 0;
BlackKingRank = 0;
WhiteKingFile = 0;
WhiteKingRank = 0;
State = null;
LastMove = null;
// 盤面
int file = BoardSize - 1;
int rank = 0;
int index = 0;
bool promotion = false;
while (true)
{
var ch = sfen[index++];
if (ch == ' ')
{
break;
}
else if (ch == '/')
{
Debug.Assert(file == -1);
++rank;
file = BoardSize - 1;
}
else if (ch == '+')
{
promotion = true;
}
else if (Char.IsDigit(ch))
{
int numNoPieces = ch - '0';
do
{
Board[file, rank] = Piece.NoPiece;
--file;
} while (--numNoPieces > 0);
}
else
{
var piece = CharToPiece[ch];
Debug.Assert(piece != Piece.NoPiece);
if (promotion)
{
piece = piece.AsPromoted();
promotion = false;
}
Board[file, rank] = piece;
Hash += Zobrist.Instance.PieceSquare[(int)piece, file, rank];
if (piece == Piece.BlackKing)
{
BlackKingFile = file;
BlackKingRank = rank;
}
else if (piece == Piece.WhiteKing)
{
WhiteKingFile = file;
WhiteKingRank = rank;
}
--file;
}
}
// 手番
var sideToMove = sfen[index++];
Debug.Assert(sideToMove == 'b' || sideToMove == 'w');
if (sideToMove == 'b')
{
SideToMove = Color.Black;
}
else
{
SideToMove = Color.White;
Hash ^= Zobrist.Instance.Side;
}
++index;
// 持ち駒
for (int handPieceIndex = 0; handPieceIndex < (int)Piece.NumPieces; ++handPieceIndex)
{
HandPieces[handPieceIndex] = 0;
}
int numAddedHandPieces = 0;
while (true)
{
var ch = sfen[index++];
if (ch == ' ')
{
break;
}
else if (ch == '-')
{
continue;
}
else if (Char.IsDigit(ch))
{
// 2桁の場合に対応する
numAddedHandPieces *= 10;
numAddedHandPieces += ch - '0';
continue;
}
var piece = CharToPiece[ch];
Debug.Assert(piece != Piece.NoPiece);
HandPieces[(int)piece] += Max(1, numAddedHandPieces);
Hash += Zobrist.Instance.HandPiece[(int)piece];
numAddedHandPieces = 0;
}
Play = int.Parse(sfen.Substring(index));
State = new PositionState();
}
