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Tweak the formulas for unsafeSquares #3268

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Tweak the formulas for unsafeSquares #3268

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Bench: 4338972
FauziAkram Dec 20, 2020
7a5b999
Bench: 4338972
FauziAkram Dec 20, 2020
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9 changes: 6 additions & 3 deletions src/evaluate.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -791,11 +791,14 @@ namespace {
unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them);

// 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
// and even smaller bonus if it is attacked but block square is not.
int k = !unsafeSquares ? 35 :
!(unsafeSquares & squaresToQueen) ? 20 :
!(unsafeSquares & blockSq) ? 9 :

int k = !unsafeSquares ? 36 :
!(unsafeSquares & ~attackedBy[Us][PAWN]) ? 30 :
!(unsafeSquares & squaresToQueen) ? 17 :
!(unsafeSquares & blockSq) ? 7 :
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0 ;

// Assign a larger bonus if the block square is defended
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