public static void UciLoop()
{
Console.Write($"id name Infrared\n");
Console.Write($"id author sfbea\n");
Console.Write($"uciok\n");
var info = new PersistentSearchInfo();
var board = new BitBoard(BoardVariant.Default);
while (true)
{
string stdin = Console.ReadLine() ?? ""; // todo: fix eval display, fix eval + pawn eval, fix black side play, fix your life
if (string.IsNullOrWhiteSpace(stdin))
{
continue;
}
if (stdin == "isready")
{
Console.Write("readyok\n");
continue;
}
else if (stdin.Length >= 8 && stdin.Substring(0, 8) == "position")
{
board = ParsePositionUci(info, stdin);
}
else if (stdin.Length >= 10 && stdin.Substring(0, 10) == "ucinewgame")
{
board = ParsePositionUci(info, "position startpos");
}
else if (stdin.Length >= 2 && stdin.Substring(0, 2) == "go")
{
ParseGoUci(board, info, stdin);
}
else if (stdin == "stop")
{
info.Timer?.Stop();
LogBestmove(info.PrincipalVariation, board);
info.Stopped = true;
}
else if (stdin == "quit")
{
info.Stopped = true;
break;
}
else if (stdin == "uci")
{
Console.Write($"id name Infrared\n");
Console.Write($"id author sfbea\n");
Console.Write($"uciok\n");
}
// NOT UCI; TESTING ONLY
if (stdin == "eval")
{
Console.WriteLine($"board eval: {Engine.Evaluator.Evaluate(board)}");
}
}
}
static BitBoard ParsePositionUci(PersistentSearchInfo info, string stdin)
{
info.Reset();
// position startpos
// position fen {fen}
// ... moves e2e4 e7e5 b7b8q
stdin = stdin.Substring(9);
BitBoard board;
if (stdin.Substring(0, 3) == "fen")
{
string fen = stdin.Substring(4).Split(" moves ")[0].Trim();
board = ChessStringCoding.DecodeFEN(fen);
}
else
{
board = new BitBoard(BoardVariant.Default);
}
if (stdin.Contains(" moves "))
{
string[] moves = stdin.Split(" moves ")[1].Split(' ');
for (int i = 0; i < moves.Length; i++)
{
var(from, to) = ChessStringCoding.DecodeMove(moves[i], out ChessPiece promotion);
board = new BitBoard(board, from, to, BitBoardUtils.GetPieceAtIndex(board, from));
if (promotion != ChessPiece.None && promotion != ChessPiece.Queen)
{
// this code will basically never run, but who knows
int zIdOffset = ZobristHashes.GetColourOffset(!board.Flags.HasFlag(BitBoardFlags.WhitesTurn));
ulong lto = 1ul << to;
board.Queens &= ~lto;
board.ZobristId ^= ZobristHashes.Hashes[(int)ChessPiece.Queen + zIdOffset, to]; // xor out queen
board.ZobristId ^= ZobristHashes.Hashes[(int)promotion + zIdOffset, to]; // xor in promoted piece
switch (promotion)
{
case ChessPiece.Rook:
board.Rooks |= lto;
break;
case ChessPiece.Bishop:
board.Bishops |= lto;
break;
case ChessPiece.Knight:
board.Knights |= lto;
break;
default:
throw new Exception();
}
if (i == moves.Length - 1)
{
// if this is the last move instruction, covered tiles must be updated
board.SetDerivitiveValues();
}
}
}
}
return(board);
}
static void ParseGoUci(BitBoard board, PersistentSearchInfo info, string stdin)
{
// go depth 8 wtime 300000 btime 3000000 winc 1000 binc 1000 movetime 1500 movestogo 35
bool isWhitesTurn = board.Flags.HasFlag(BitBoardFlags.WhitesTurn);
int time = int.MinValue;
int increment = 0;
int depth = int.MinValue;
int movestogo = 30;
int movetime = int.MinValue;
string[] paramaters = stdin.Split(' ');
for (int i = 1 /* skip 'go' */; i < paramaters.Length; i++)
{
// 'infinite' param will just skip over everything and continue
if (paramaters[i] == "wtime" && isWhitesTurn || paramaters[i] == "btime" && !isWhitesTurn)
{
time = int.Parse(paramaters[i + 1]);
i++;
}
else if (paramaters[i] == "winc" && isWhitesTurn || paramaters[i] == "binc" && !isWhitesTurn)
{
increment = int.Parse(paramaters[i + 1]);
i++;
}
else if (paramaters[i] == "movetime")
{
movetime = int.Parse(paramaters[i + 1]);
i++;
}
else if (paramaters[i] == "movestogo")
{
movestogo = int.Parse(paramaters[i + 1]);
i++;
}
else if (paramaters[i] == "depth")
{
depth = int.Parse(paramaters[i + 1]);
i++;
}
}
// create search thread
var thread = new Thread(() => Engine.Search.Search_PVS_IDF(board, info));
// configure depth limit
info.MaxIdfDepth = depth == int.MinValue ? 50 : depth;
// configure engine timer
if (time != int.MinValue || movetime != int.MinValue)
{
var timer = new System.Timers.Timer {
AutoReset = false,
// time controls
Interval = movetime == int.MinValue ? time / movestogo + increment - 50 : movetime - 50,
};
timer.Elapsed += (object sender, System.Timers.ElapsedEventArgs args) => {
LogBestmove(info.PrincipalVariation, board);
info.Stopped = true;
timer.Close();
};
timer.Start();
info.Timer = timer;
}
thread.Start();
}