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Replace constant LMR history divisor with depth-based array

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Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 677344 W: 175301 L: 174041 D: 328002
Ptnml(0-2): 2018, 79669, 174166, 80673, 2146
https://tests.stockfishchess.org/tests/view/69cfae021668971c9da23b80

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 46470 W: 11988 L: 11651 D: 22831
Ptnml(0-2): 37, 4877, 13055, 5244, 22
https://tests.stockfishchess.org/tests/view/69dcd13c3ca80bdf151d4ab5

Passed VLTC (non-reg.):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 58986 W: 15120 L: 14947 D: 28919
Ptnml(0-2): 7, 5835, 17636, 6008, 7
https://tests.stockfishchess.org/tests/view/69debc6c5c67bee7d241ffe9

closes https://github.com/official-stockfish/Stockfish/pull/6741

Bench: 2723949
This commit is contained in:
FauziAkram
2026-04-19 07:15:43 +02:00
committed by Joost VandeVondele
parent de7b0cd7a6
commit 95f3680080
1 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+5 -1
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@@ -52,6 +52,9 @@
namespace Stockfish {
static constexpr std::array<int, 16> lmrDivisor = {3307, 2930, 2874, 2818, 3215, 3225, 3224, 2782,
2858, 2919, 3088, 3275, 3180, 2868, 3006, 3599};
namespace TB = Tablebases;
void syzygy_extend_pv(const OptionsMap& options,
@@ -1097,6 +1100,7 @@ moves_loop: // When in check, search starts here
}
else if (!ss->followPV || !PvNode)
{
int dIndex = std::clamp(int(depth), 1, int(lmrDivisor.size())) - 1;
int history = (*contHist[0])[movedPiece][move.to_sq()]
+ (*contHist[1])[movedPiece][move.to_sq()]
+ sharedHistory.pawn_entry(pos)[movedPiece][move.to_sq()];
@@ -1108,7 +1112,7 @@ moves_loop: // When in check, search starts here
history += 71 * mainHistory[us][move.raw()] / 32;
// (*Scaler): Generally, lower divisors scales well
lmrDepth += history / 2995;
lmrDepth += history / lmrDivisor[dIndex];
Value futilityValue = ss->staticEval + 42 + 151 * !bestMove + 120 * lmrDepth
+ 86 * (ss->staticEval > alpha);