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k += 5 if the RQ is anywhere on the file. Bench: 4804769
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@31m059
31m059 committed Nov 8, 2019
1 parent 9f312c8 commit 383a01b
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion src/evaluate.cpp
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Expand Up @@ -626,7 +626,7 @@ namespace {
0 ;

// Assign a larger bonus if the block square is defended
if ((pos.pieces(Us) & bb) || (attackedBy[Us][ALL_PIECES] & blockSq))
if ((pos.pieces(Us, ROOK, QUEEN) & file_bb(s)) || (attackedBy[Us][ALL_PIECES] & blockSq))
k += 5;

bonus += make_score(k * w, k * w);
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2 comments on commit 383a01b

@Rocky640
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If the rook queen is in front, we already have attackedBy[Us][ALL_PIECES] & blockSq
So you are only adding the case where rook/queen is in front of blocksq but does not see it.

@31m059
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@31m059 31m059 commented on 383a01b Nov 8, 2019 •
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@Rocky640 Very good point, I'm sorry for overlooking that. Thank you!

I do think it's possible we should have some bonus in that case though... The intervening piece, which prevents our rook/queen from seeing the blockSq, may be vulnerable to pressure: we may be able to x-ray defense of the passed pawn.

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