private static float StaticEvaluation(Chessboard board, int depth)
{
if (board.CurrentState == GameState.Checkmate)
{
// note: the turn is updated even after checkmate
return((depth + 1) * ((board.CurrentTeamTurn == TeamColor.Black ? float.MaxValue : float.MinValue) / 100));
}
if (board.CurrentState == GameState.Stalemate)
{
return(0);
}
float centipawns = 0;
foreach ((Pawn, Coordinate)item in board.GetPieces <Pawn>())
{
int dangerzoneSum = board.GetDangerSquareSum(item.Item2);
if (item.Item1.Color == TeamColor.White)
{
if (dangerzoneSum <= 0)
{
continue;
}
centipawns += 0.05f * (item.Item2.Rank - 1);
}
else
{
if (dangerzoneSum >= 0)
{
continue;
}
centipawns -= 0.05f * (7 - item.Item2.Rank);
}
}
foreach (var item in board.Dangerzone)
{
if (item.Key.Rank < 3 || item.Key.Rank > 4)
{
continue;
}
if (item.Key.File < 2 || item.Key.File > 5)
{
continue;
}
if (item.Value is null)
{
continue;
}
int round = board.Moves.Count + 1;
foreach (var piece in item.Value)
{
if (piece is Queen)
{
continue;
}
if (piece.Color == TeamColor.White)
{
centipawns += CenterSquareRawValue / (round * CenterSquareModifier);
}
else
{
centipawns -= CenterSquareRawValue / (round * CenterSquareModifier);
}
}
}
return(board.MaterialSum + centipawns);
}
