private IPlayerMove CreateNewMove(bool checkOpenings, int?overrideSearchDepth = null)
{
var isMaximizing = IsPlayerWhite;
Diagnostics.StartMoveCalculations();
// Common start measures
if (Settings.UseTranspositionTables)
{
// Delete old entries from tables
var transpositions = Board.Shared.Transpositions.Tables;
if (transpositions.Any())
{
var toBeDeleted = new List <ulong>();
var currentTurnCount = Board.Shared.GameTurnCount;
foreach (var transposition in transpositions)
{
// If transposition.turn 20 < current 25 - 4
if (transposition.Value.GameTurnCount <
currentTurnCount - Settings.ClearSavedTranspositionsAfterTurnsPassed)
{
toBeDeleted.Add(transposition.Key);
}
}
foreach (var hash in toBeDeleted)
{
transpositions.Remove(hash);
}
if (Settings.UseFullDiagnostics)
{
if (toBeDeleted.Any())
{
Diagnostics.AddMessage($"Deleted {toBeDeleted.Count} old transposition entries.");
}
Diagnostics.AddMessage($"Total transpositions: {transpositions.Count}.");
}
}
}
// Opening
if (GameHistory.Count < 10 && checkOpenings)
{
var previousMoves = GetPreviousMoves();
var openingMove = Openings.NextMove(previousMoves);
if (openingMove != null)
{
var openingMoveWithData = Board.CollectMoveProperties(openingMove);
Board.ExecuteMove(openingMoveWithData);
Board.Shared.GameTurnCount++;
PreviousData = Diagnostics.CollectAndClear();
var result = new PlayerMoveImplementation(
openingMove.ToInterfaceMove(), PreviousData.ToString());
GameHistory.Add(result.Move);
return(result);
}
}
// Get all available moves and do necessary filtering
List <SingleMove> allMoves = Board.Moves(isMaximizing, true, true).ToList();
if (allMoves.Count == 0)
{
// Game ended to stalemate
throw new ArgumentException(
$"No possible moves for player [isWhite={IsPlayerWhite}]. Game should have ended to draw (stalemate).");
}
if (MoveHistory.IsLeaningToDraw(GameHistory))
{
// Take 4th from the end of list
var repetionMove = GameHistory[^ 4];
public override IPlayerMove CreateMove()
{
if (_connectionTestOverride)
{
var diagnostics = Diagnostics.CollectAndClear();
// Dummy moves for connection testing
var move = new PlayerMoveImplementation()
{
Move = new MoveImplementation()
{
StartPosition = $"a{_connectionTestIndex--}",
EndPosition = $"a{_connectionTestIndex}",
PromotionResult = PromotionPieceType.NoPromotion
},
Diagnostics = diagnostics.ToString()
};
return(move);
}
else
{
var isMaximizing = IsPlayerWhite;
Diagnostics.StartMoveCalculations();
// Get all available moves and do necessary filtering
List <SingleMove> allMoves = Board.Moves(isMaximizing, true, true).ToList();
if (allMoves.Count == 0)
{
throw new ArgumentException($"No possible moves for player [isWhite={IsPlayerWhite}]. Game should have ended to draw (stalemate).");
}
// Reorder moves to improve alpha-beta cutoffs
// allMoves = MoveResearch.OrderMoves(allMoves, Board, isMaximizing);
if (MoveHistory.IsLeaningToDraw(GameHistory))
{
var repetionMove = GameHistory[GameHistory.Count - 4];
allMoves.RemoveAll(m =>
m.PrevPos.ToAlgebraic() == repetionMove.StartPosition &&
m.NewPos.ToAlgebraic() == repetionMove.EndPosition);
}
Diagnostics.AddMessage($"Available moves found: {allMoves.Count}. ");
Strategy.Update(PreviousData, TurnCount);
var strategyResult = Strategy.DecideSearchDepth(PreviousData, allMoves, Board);
SearchDepth = strategyResult.searchDepth;
Phase = strategyResult.gamePhase;
var bestMove = AnalyzeBestMove(allMoves);
if (bestMove == null)
{
throw new ArgumentException($"Board didn't contain any possible move for player [isWhite={IsPlayerWhite}].");
}
// Update local
Board.ExecuteMove(bestMove);
TurnCount++;
// Endgame checks
// TODO should be now read from singlemove
var castling = false;
var check = Board.IsCheck(IsPlayerWhite);
//var checkMate = false;
//if(check) checkMate = Board.IsCheckMate(IsPlayerWhite, true);
if (bestMove.Promotion)
{
Diagnostics.AddMessage($"Promotion occured at {bestMove.NewPos.ToAlgebraic()}. ");
}
PreviousData = Diagnostics.CollectAndClear();
var move = new PlayerMoveImplementation()
{
Move = bestMove.ToInterfaceMove(castling, check),
Diagnostics = PreviousData.ToString()
};
GameHistory.Add(move.Move);
return(move);
}
}