// evaluate_outposts() evaluates bishop and knight outpost squares
public static Score evaluate_outposts(Position pos, EvalInfo ei, Square s, PieceType Pt, Color Us)
{
Color Them = (Us == ColorS.WHITE ? ColorS.BLACK : ColorS.WHITE);
Debug.Assert(Pt == PieceTypeS.BISHOP || Pt == PieceTypeS.KNIGHT);
// Initial bonus based on square
Value bonus = Outpost[Pt == PieceTypeS.BISHOP ? 1 : 0][Types.relative_square(Us, s)];
// Increase bonus if supported by pawn, especially if the opponent has
// no minor piece which can trade with the outpost piece.
if (bonus != 0 && (ei.attackedBy[Us][PieceTypeS.PAWN] & BitBoard.SquareBB[s]) != 0)
{
if (0 == pos.pieces_color_piecetype(Them, PieceTypeS.KNIGHT) &&
0 == (BitBoard.squares_of_color(s) & pos.pieces_color_piecetype(Them, PieceTypeS.BISHOP)))
{
bonus += bonus + bonus / 2;
}
else
{
bonus += bonus / 2;
}
}
return(Types.make_score(bonus, bonus));
}
