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More bonus for free passed pawn

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Give even more bonus to passed pawn if adjacent squares to its path
are not attacked.

passed STC
http://tests.stockfishchess.org/tests/view/5d08c9b10ebc5925cf0a6630
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 175197 W: 39859 L: 38816 D: 96522

passed LTC
http://tests.stockfishchess.org/tests/view/5d0ab8240ebc5925cf0a8fe4
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 92928 W: 16124 L: 15682 D: 61122

Bench: 3398333
This commit is contained in:
Vizvezdenec 2019-06-20 03:05:57 +03:00 • committed by Stephane Nicolet
parent 8bf21a723e
commit 37ffacf209
1 changed files with 7 additions and 1 deletions
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8
src/evaluate.cpp
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@ -605,6 +605,7 @@ namespace {
}; };
Bitboard b, bb, squaresToQueen, defendedSquares, unsafeSquares; Bitboard b, bb, squaresToQueen, defendedSquares, unsafeSquares;
Bitboard wideUnsafeSquares;
Score score = SCORE_ZERO; Score score = SCORE_ZERO;
b = pe->passed_pawns(Us); b = pe->passed_pawns(Us);
@ -639,6 +640,7 @@ namespace {
// consider all the squaresToQueen. Otherwise consider only the squares // consider all the squaresToQueen. Otherwise consider only the squares
// in the pawn's path attacked or occupied by the enemy. // in the pawn's path attacked or occupied by the enemy.
defendedSquares = unsafeSquares = squaresToQueen = forward_file_bb(Us, s); defendedSquares = unsafeSquares = squaresToQueen = forward_file_bb(Us, s);
wideUnsafeSquares = AllSquares;
bb = forward_file_bb(Them, s) & pos.pieces(ROOK, QUEEN); bb = forward_file_bb(Them, s) & pos.pieces(ROOK, QUEEN);
@ -648,9 +650,13 @@ namespace {
if (!(pos.pieces(Them) & bb)) if (!(pos.pieces(Them) & bb))
unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them); unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them);
if (!unsafeSquares)
wideUnsafeSquares = (attackedBy[Them][ALL_PIECES] | pos.pieces(Them))
& (shift<WEST>(squaresToQueen) | shift<EAST>(squaresToQueen));
// If there aren't any enemy attacks, assign a big bonus. Otherwise // If there aren't any enemy attacks, assign a big bonus. Otherwise
// assign a smaller bonus if the block square isn't attacked. // assign a smaller bonus if the block square isn't attacked.
int k = !unsafeSquares ? 20 : !(unsafeSquares & blockSq) ? 9 : 0; int k = !wideUnsafeSquares ? 35 : !unsafeSquares ? 20 : !(unsafeSquares & blockSq) ? 9 : 0;
// Assign a larger bonus if the block square is defended. // Assign a larger bonus if the block square is defended.
if (defendedSquares & blockSq) if (defendedSquares & blockSq)