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Tweak the formulas for unsafeSquares

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We give more bonus for a special case: If there are some enemy squares occupied
or attacked by the enemy on the passed pawn span,
but if they are all attacked by our pawn, use new intermediate factor 30.

The main credit goes to Rocky for the idea, with additional tuning and tests.

Passed STC:
LLR: 2.95 (-2.94,2.94) {-0.25,1.25}
Total: 96464 W: 19233 L: 18834 D: 58397
Ptnml(0-2): 1683, 11327, 21950, 11452, 1820
https://tests.stockfishchess.org/tests/view/5fdd21ab3932f79192d39357

Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 81320 W: 10784 L: 10352 D: 60184
Ptnml(0-2): 602, 7524, 24044, 7820, 670
https://tests.stockfishchess.org/tests/view/5fddec983932f79192d393a4

closes https://github.com/official-stockfish/Stockfish/pull/3268

Bench: 4338972
This commit is contained in:
FauziAkram 2020-12-20 17:50:34 +02:00 • committed by Joost VandeVondele
parent 1f3b5b8b54
commit 45b05328b6
1 changed files with 5 additions and 3 deletions
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8
src/evaluate.cpp
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@ -791,11 +791,13 @@ namespace {
unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them); unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them);
// If there are no enemy pieces or attacks on passed pawn span, assign a big bonus. // If there are no enemy pieces or attacks on passed pawn span, assign a big bonus.
// Or if there is some, but they are all attacked by our pawns, assign a bit smaller bonus.
// Otherwise assign a smaller bonus if the path to queen is not attacked // Otherwise assign a smaller bonus if the path to queen is not attacked
// and even smaller bonus if it is attacked but block square is not. // and even smaller bonus if it is attacked but block square is not.
int k = !unsafeSquares ? 35 : int k = !unsafeSquares ? 36 :
!(unsafeSquares & squaresToQueen) ? 20 : !(unsafeSquares & ~attackedBy[Us][PAWN]) ? 30 :
!(unsafeSquares & blockSq) ? 9 : !(unsafeSquares & squaresToQueen) ? 17 :
!(unsafeSquares & blockSq) ? 7 :
0 ; 0 ;
// Assign a larger bonus if the block square is defended // Assign a larger bonus if the block square is defended