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Reduce less for positions without tt move

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Continuation of work on scaling.
In line with previous scaling patches this one massively reduces
reduction for moves that don't go thru lmr for position without a tt
move.

Passed VVLTC with STC bounds:
https://tests.stockfishchess.org/tests/view/679fd2450774dfd78deb12b2
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 74718 W: 19354 L: 19042 D: 36322
Ptnml(0-2): 5, 6724, 23595, 7024, 11

Passed VVLTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/67a009930774dfd78deb2346
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 82638 W: 21587 L: 21212 D: 39839
Ptnml(0-2): 15, 7476, 25953, 7869, 6

closes https://github.com/official-stockfish/Stockfish/pull/5860

Bench: 2887850
This commit is contained in:
Michael Chaly
2025-02-04 22:14:13 +03:00
committed by Disservin
parent 67573218e1
commit e852d9880a
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -1241,7 +1241,7 @@ moves_loop: // When in check, search starts here
{ {
// Increase reduction if ttMove is not present // Increase reduction if ttMove is not present
if (!ttData.move) if (!ttData.move)
r += 2117; r += 1111;
// Note that if expected reduction is high, we reduce search depth here // Note that if expected reduction is high, we reduce search depth here
value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha, value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha,