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Depth dependent reduction threshold when full-depth re-search

Browse Source 
STC: https://tests.stockfishchess.org/tests/view/68894d577b562f5f7b73273b
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 155072 W: 40651 L: 40150 D: 74271
Ptnml(0-2): 609, 18271, 39292, 18738, 626

LTC: https://tests.stockfishchess.org/tests/view/688c2705502b34dd5e71127a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 321012 W: 82891 L: 81995 D: 156126
Ptnml(0-2): 227, 34421, 90285, 35375, 198

This commit was generated using qwen3-235b-a22b-thinking-2507:

Prompt: https://rentry.co/iqtaoht7

Reasoning/thinking: https://rentry.co/wm6t9hye

closes https://github.com/official-stockfish/Stockfish/pull/6210

Bench: 2983938
This commit is contained in:
Jost Triller
2025-08-04 15:12:55 +02:00
committed by Joost VandeVondele
parent 14a2e50a3d
commit 377a3a5269
2 changed files with 6 additions and 1 deletions
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AUTHORS
+1
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@@ -125,6 +125,7 @@ Jonathan McDermid (jonathanmcdermid)
Joost VandeVondele (vondele) Joost VandeVondele (vondele)
Joseph Ellis (jhellis3) Joseph Ellis (jhellis3)
Joseph R. Prostko Joseph R. Prostko
Jost Triller (tsoj)
Jörg Oster (joergoster) Jörg Oster (joergoster)
Julian Willemer (NightlyKing) Julian Willemer (NightlyKing)
jundery jundery
src/search.cpp
+5 -1
View File
@@ -1251,9 +1251,13 @@ moves_loop: // When in check, search starts here
if (!ttData.move) if (!ttData.move)
r += 1139; r += 1139;
const int threshold1 = depth <= 4 ? 2000 : 3200;
const int threshold2 = depth <= 4 ? 3500 : 4600;
// 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,
newDepth - (r > 3200) - (r > 4600 && newDepth > 2), !cutNode); newDepth - (r > threshold1) - (r > threshold2 && newDepth > 2),
!cutNode);
} }
// For PV nodes only, do a full PV search on the first move or after a fail high, // For PV nodes only, do a full PV search on the first move or after a fail high,