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Simplify bad quiets

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The main difference is that instead of returning the first bad quiet as
a good one we fall through. This is actually more correct and simpler
to implement.

Non regression STC:
https://tests.stockfishchess.org/tests/view/659bbb3479aa8af82b964ec7
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 150944 W: 38399 L: 38305 D: 74240
Ptnml(0-2): 485, 18042, 38298, 18188, 459

Non regression LTC:
https://tests.stockfishchess.org/tests/view/659c6e6279aa8af82b9660eb
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 192060 W: 47871 L: 47823 D: 96366
Ptnml(0-2): 144, 21912, 51845, 22010, 119

The cutoff is now -8K instead of -7.5K.
-7.5K failed. https://tests.stockfishchess.org/tests/view/659a1f4b79aa8af82b962a0e
This was likely a false negative.

closes https://github.com/official-stockfish/Stockfish/pull/4975

Bench: 1308279
This commit is contained in:
mstembera 2024-01-08 01:03:38 -08:00 • committed by Disservin
parent 3372ee9c26
commit eec361f64c
1 changed files with 4 additions and 12 deletions
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16
src/movepick.cpp
View file

@ -312,19 +312,11 @@ top:
return *cur != refutations[0] && *cur != refutations[1] && *cur != refutations[2];
}))
{
Move tmp = *(cur - 1);
if ((cur - 1)->value < -7500 && (cur - 1)->value > quiet_threshold(depth))
{
if ((cur - 1)->value > -8000 || (cur - 1)->value <= quiet_threshold(depth))
return *(cur - 1);
// Remaining quiets are bad
beginBadQuiets = cur;
// Prepare the pointers to loop over the bad captures
cur = moves;
endMoves = endBadCaptures;
++stage;
}
return tmp;
beginBadQuiets = cur - 1;
}
// Prepare the pointers to loop over the bad captures