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Merge 'passed_pawns' tweaks

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Good at both short and long TC

15+0.05
LLR: 2.96 (-2.94,2.94)
Total: 28220 W: 5531 L: 5349 D: 17340

TC 60+0.05
LLR: 2.95 (-2.94,2.94)
Total: 12612 W: 2221 L: 2057 D: 8334

bench: 4857939
This commit is contained in:
Marco Costalba 2013-05-08 23:02:08 +02:00
commit 02606a8c83
1 changed files with 24 additions and 10 deletions
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32
src/evaluate.cpp
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@ -899,16 +899,30 @@ Value do_evaluate(const Position& pos, Value& margin) {
else else
unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them)); unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
// If there aren't enemy attacks or pieces along the path to queen give // Default bonus for the empty square in front
// huge bonus. Even bigger if we protect the pawn's path. int bonusMultiplier = 3;
if ((defendedSquares & SquareBB[blockSq]) != 0)
{
// Defending the square in front
bonusMultiplier += 2;
if ((unsafeSquares & defendedSquares) == unsafeSquares)
// Defending all the attacked squares
// bigger bonus if we are defending everything
bonusMultiplier += (squaresToQueen == defendedSquares) ? 4 : 2;
}
if ((unsafeSquares & SquareBB[blockSq]) == 0)
{
// The square infront isn't attacked
bonusMultiplier += 6;
if (!unsafeSquares) if (!unsafeSquares)
ebonus += Value(rr * (squaresToQueen == defendedSquares ? 17 : 15)); bonusMultiplier += 6;
else }
// OK, there are enemy attacks or pieces (but not pawns). Are those
// squares which are attacked by the enemy also attacked by us ? Value bonus = Value(rr * bonusMultiplier);
// If yes, big bonus (but smaller than when there are no enemy attacks), ebonus += bonus;
// if no, somewhat smaller bonus. mbonus += bonus;
ebonus += Value(rr * ((unsafeSquares & defendedSquares) == unsafeSquares ? 13 : 8));
} }
} // rr != 0 } // rr != 0