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Tune Fail Low Bonus

Browse source 
Fractional bonus idea is from @Ergodice on
[discord](https://discord.com/channels/435943710472011776/735707599353151579/1244039134499180614).
Values are tuned for 149k games at LTC.

SPSA tune:
https://tests.stockfishchess.org/tests/view/6652d5d5a86388d5e27da9d6

Failed STC:
LLR: -2.95 (-2.94,2.94) <0.00,2.00>
Total: 67424 W: 17364 L: 17528 D: 32532
Ptnml(0-2): 238, 8043, 17299, 7909, 223
https://tests.stockfishchess.org/tests/view/66551e1ba86388d5e27db9f9

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 146910 W: 37141 L: 36695 D: 73074
Ptnml(0-2): 84, 16201, 40441, 16643, 86
https://tests.stockfishchess.org/tests/view/66559949a86388d5e27dcc5d

Passed VLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 27248 W: 6924 L: 6633 D: 13691
Ptnml(0-2): 5, 2744, 7835, 3035, 5
https://tests.stockfishchess.org/tests/view/66563f4da86388d5e27dd27a

closes https://github.com/official-stockfish/Stockfish/pull/5299

Bench: 1390709
This commit is contained in:
Shawn Xu 2024-05-27 01:21:32 -07:00 • committed by Disservin
parent c7b80f6c8a
commit c14297a483
1 changed files with 7 additions and 6 deletions
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13
src/search.cpp
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@ -1341,18 +1341,19 @@ moves_loop: // When in check, search starts here
// Bonus for prior countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonus = (depth > 4) + (depth > 5) + (PvNode || cutNode) + ((ss - 1)->statScore < -14144)
+ ((ss - 1)->moveCount > 9) + (!ss->inCheck && bestValue <= ss->staticEval - 115)
+ (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 81);
int bonus = (54 * (depth > 4) + 62 * (depth > 5) + 115 * (PvNode || cutNode)
+ 186 * ((ss - 1)->statScore < -14144) + 121 * ((ss - 1)->moveCount > 9)
+ 64 * (!ss->inCheck && bestValue <= ss->staticEval - 115)
+ 137 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 81));
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
stat_bonus(depth) * bonus);
stat_bonus(depth) * bonus / 100);
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()]
<< stat_bonus(depth) * bonus / 2;
<< stat_bonus(depth) * bonus / 200;
if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
thisThread->pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq]
<< stat_bonus(depth) * bonus * 4;
<< stat_bonus(depth) * bonus / 25;
}
if (PvNode)