/// <summary>
/// Executes a command and returns a corresponding response.
/// </summary>
/// <param name="command">The command.</param>
protected virtual Response ExecuteCommand(Command command)
{
switch (command.Name)
{
case "protocol_version":
return(new Response(command, "2"));
case "name":
return(new Response(command, this.Name.Replace('\n', ' ')));
case "version":
return(new Response(command, this.Version.Replace('\n', ' ')));
case "list_commands":
return(new Response(command, string.Join("\n", this.SupportedCommands)));
case "known_command":
return(new Response(
command,
command.Arguments.Count > 0 && SupportedCommands.Contains(command.Arguments[0]) ? "true" : "false"
));
case "quit":
return(new Response(command));
case "boardsize":
try {
int size = int.Parse(command.Arguments[0]);
if (size > 25)
{
throw new Exception();
}
this.Board = new Board(size);
return(new Response(command));
} catch {}
return(new Response(command, "unacceptable size", true));
case "clear_board":
this.MoveHistory.Clear();
this.Board.Clear();
return(new Response(command));
case "komi":
try {
this.Komi = float.Parse(command.Arguments[0]);
return(new Response(command));
} catch {}
return(new Response(command, "syntax error", true));
case "fixed_handicap":
if (!this.Board.IsEmpty())
{
return(new Response(command, "board not empty", true));
}
try {
int count = int.Parse(command.Arguments[0]);
if (count < 2 || count > 9 || this.Board.Size < 7)
{
return(new Response(command, "invalid number of stones", true));
}
foreach (Vertex v in Board.GetHandicapPlacement(count))
{
Board[v] = 1;
}
return(new Response(command));
} catch {}
return(new Response(command, "syntax error", true));
case "set_free_handicap":
if (!this.Board.IsEmpty())
{
return(new Response(command, "board not empty", true));
}
try {
List <Vertex> vs = new List <Vertex>();
foreach (string input in command.Arguments)
{
Vertex v = new Vertex(input);
if (v == Vertex.Pass || vs.Contains(v))
{
return(new Response(command, "bad vertex list", true));
}
vs.Add(v);
}
foreach (Vertex v in vs)
{
this.Board[v] = 1;
}
return(new Response(command));
} catch {}
return(new Response(command, "syntax error", true));
case "play":
try {
Move move = Move.Parse(string.Join(" ", command.Arguments));
this.Play(move);
return(new Response(command));
} catch (FormatException) {
return(new Response(command, "syntax error", true));
} catch (InvalidOperationException) {
return(new Response(command, "illegal move", true));
}
case "genmove":
try {
Color color = (Color)Enum.Parse(typeof(Color), command.Arguments[0], true);
Vertex?vertex = GenerateMove(color);
if (vertex.HasValue)
{
// Make move and add to move history
Move move = new Move(color, vertex.Value);
this.Play(move);
}
return(new Response(command, vertex.HasValue ? vertex.ToString() : "resign"));
} catch {}
return(new Response(command, "syntax error", true));
case "undo":
if (MoveHistory.Count == 0)
{
return(new Response(command, "cannot undo", true));
}
Tuple <Move, Board> tuple = MoveHistory.Pop();
this.Board = tuple.Item2;
return(new Response(command));
case "showboard":
string result = this.Board.ToString() + "\n-\n";
result += "(X) captured " + this.Board.Captures[Color.Black] + "\n";
result += "(O) captured " + this.Board.Captures[Color.White];
return(new Response(command, result));
}
return(new Response(command, "unknown command", true));
}
public void UnMake()
{
if (!MoveHistory.Any())
{
throw new Exception("No move to unmake");
}
int MoveToUnmake = MoveHistory.Pop();
int ColorMadeMove = 1 - ColorToMove;
int fromSquare = Move.FromSquare(MoveToUnmake);
int toSquare = Move.ToSquare(MoveToUnmake);
int fromPiece = Move.FromPiece(MoveToUnmake);
int toPiece = Move.ToPiece(MoveToUnmake);
MovesFiftyHistory.Pop();
//Moving Back And Cancelling Capturing
SquarePiece[toSquare] = toPiece;
SquarePiece[fromSquare] = fromPiece;
PieceBitboard[fromPiece] ^= 1UL << fromSquare; //no changes
PieceBitboard[fromPiece] ^= 1UL << toSquare; //no changes
PieceBitboard[fromPiece & Color.Mask] ^= 1UL << fromSquare; //no changes
PieceBitboard[fromPiece & Color.Mask] ^= 1UL << toSquare; //no changes
OccupiedBB ^= 1UL << fromSquare; //no changes
if (toPiece != 0)
{
PieceBitboard[toPiece] ^= 1UL << toSquare;
PieceBitboard[toPiece & Color.Mask] ^= 1UL << toSquare;
int EnemyLeftRookIndex = 56 * ColorMadeMove;
if (toSquare == EnemyLeftRookIndex && toPiece == Piece.Rook && CastleShortIndex[1 - ColorMadeMove] <= 0)
{
CastleShortIndex[1 - ColorMadeMove]++;
}
else if (toSquare == EnemyLeftRookIndex + 7 && toPiece == Piece.Rook && CastleLongIndex[1 - ColorMadeMove] <= 0)
{
CastleShortIndex[1 - ColorMadeMove]++;
}
}
else
{
OccupiedBB ^= 1UL << toSquare;
}
if (CastleShortIndex[ColorMadeMove] <= 0)
{
CastleShortIndex[ColorMadeMove]++;
}
if (CastleLongIndex[ColorMadeMove] <= 0)
{
CastleLongIndex[ColorMadeMove]++;
}
if (CastleShortIndex[1 - ColorMadeMove] <= 0)
{
CastleShortIndex[1 - ColorMadeMove]++;
}
if (CastleLongIndex[1 - ColorMadeMove] <= 0)
{
CastleLongIndex[1 - ColorMadeMove]++;
}
//Castling Back
if (Move.Castling(MoveToUnmake))
{
int sidePreIndex = 56 * ColorMadeMove;
int rookSquare, rookToSquare;
//Short castling (getting rook position)
if (File(toSquare) == 6)
{
rookSquare = sidePreIndex + 7;
rookToSquare = fromSquare + 1;
}
//Long castling (getting rook position)
else
{
rookSquare = sidePreIndex;
rookToSquare = fromSquare - 1;
}
//Moving the rook back
SquarePiece[rookSquare] = SquarePiece[rookToSquare];
SquarePiece[rookToSquare] = 0;
OccupiedBB ^= 1UL << rookSquare;
OccupiedBB ^= 1UL << rookToSquare;
PieceBitboard[Piece.Rook | ColorMadeMove] ^= 1UL << rookSquare;
PieceBitboard[Piece.Rook | ColorMadeMove] ^= 1UL << rookToSquare;
PieceBitboard[ColorMadeMove] ^= 1UL << rookSquare;
PieceBitboard[ColorMadeMove] ^= 1UL << rookToSquare;
}
//Promotion
if (Move.Promotion(MoveToUnmake))
{
int PromotedTo = Move.PromotionPiece(MoveToUnmake); //Either queen, knight, bishop or rook
//SquarePiece[toSquare] = PromotedTo;
//If we are here, we've just set the PieceBitboard[fromPiece] to 1 at the toSquare thinking of doing the opposite, so we need to cancel that
PieceBitboard[fromPiece] ^= 1UL << toSquare;
PieceBitboard[PromotedTo] ^= 1UL << toSquare;
//Color maps do not change, as well as occupied (we're just replacing the piece)
}
//Enpassant
if (Move.EnPassant(MoveToUnmake))
{
//Restoring the pawn
int EnPassantVictimSquare = toSquare + 16 * ColorMadeMove - 8;
UInt64 enPassantVictimBitboard = 1UL << EnPassantVictimSquare;
OccupiedBB ^= enPassantVictimBitboard;
PieceBitboard[Piece.Pawn | ColorToMove] ^= enPassantVictimBitboard;
PieceBitboard[ColorToMove] ^= enPassantVictimBitboard;
SquarePiece[EnPassantVictimSquare] = Piece.Pawn | ColorToMove;
}
ColorToMove = ColorMadeMove;
EnPassantHistory.Pop();
}