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Simplify limiting extensions.

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Replace the current method for limiting extensions to avoid search getting stuck
with a much simpler method.

the test position in https://github.com/official-stockfish/Stockfish/commit/73018a03375b4b72ee482eb5a4a2152d7e4f0aac
can still be searched without stuck search.

fixes #3815 where the search now makes progress with rootDepth

shows robust behavior in a d10 search for 1M positions.

passed STC
https://tests.stockfishchess.org/tests/view/61e303e3babab931824dfb18
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 57568 W: 15449 L: 15327 D: 26792
Ptnml(0-2): 243, 6211, 15779, 6283, 268

passed LTC
https://tests.stockfishchess.org/tests/view/61e3586cbabab931824e091c
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 128200 W: 34632 L: 34613 D: 58955
Ptnml(0-2): 124, 12559, 38710, 12588, 119

closes https://github.com/official-stockfish/Stockfish/pull/3899

Bench: 4550528
This commit is contained in:
J. Oster
2022-01-15 18:18:52 +01:00
committed by Joost VandeVondele
parent 77cf5704b6
commit 9083050be6
2 changed files with 59 additions and 100 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/thread.h
+1 -6
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@@ -60,16 +60,11 @@ public:
Pawns::Table pawnsTable;
Material::Table materialTable;
size_t pvIdx, pvLast;
RunningAverage doubleExtensionAverage[COLOR_NB];
RunningAverage complexityAverage;
uint64_t nodesLastExplosive;
uint64_t nodesLastNormal;
std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
Value bestValue;
int selDepth, nmpMinPly;
Color nmpColor;
ExplosionState state;
Value optimism[COLOR_NB];
Value bestValue, optimism[COLOR_NB];
Position rootPos;
StateInfo rootState;