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Remove QS_CHECKS movepick stage

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Passed STC: https://tests.stockfishchess.org/tests/view/669597cf4ff211be9d4ec147
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 199072 W: 52100 L: 52058 D: 94914
Ptnml(0-2): 829, 23679, 50406, 23865, 757

Passed LTC: https://tests.stockfishchess.org/tests/view/66988f5f4ff211be9d4ec33e
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 119778 W: 30420 L: 30299 D: 59059
Ptnml(0-2): 106, 13293, 32957, 13440, 93

closes https://github.com/official-stockfish/Stockfish/pull/5498

Bench 1499842
This commit is contained in:
Dubslow
2024-05-02 05:35:15 -05:00
committed by Joost VandeVondele
parent e57fba7fc9
commit 703f17975b
5 changed files with 19 additions and 71 deletions
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src/search.cpp
+2 -8
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@@ -1475,12 +1475,6 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
assert(0 <= ss->ply && ss->ply < MAX_PLY);
// Note that unlike regular search, which stores the literal depth into the
// transposition table, from qsearch we only store the current movegen stage
// as "depth". If in check, we search all evasions and thus store DEPTH_QS_CHECKS.
// Evasions may be quiet, and _CHECKS includes quiets.
Depth qsTtDepth = ss->inCheck || depth >= DEPTH_QS_CHECKS ? DEPTH_QS_CHECKS : DEPTH_QS_NORMAL;
// Step 3. Transposition table lookup
posKey = pos.key();
auto [ttHit, ttData, ttWriter] = tt.probe(posKey);
@@ -1491,7 +1485,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
pvHit = ttHit && ttData.is_pv;
// At non-PV nodes we check for an early TT cutoff
if (!PvNode && ttData.depth >= qsTtDepth
if (!PvNode && ttData.depth >= DEPTH_QS
&& ttData.value != VALUE_NONE // Can happen when !ttHit or when access race in probe()
&& (ttData.bound & (ttData.value >= beta ? BOUND_LOWER : BOUND_UPPER)))
return ttData.value;
@@ -1674,7 +1668,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
// Save gathered info in transposition table. The static evaluation
// is saved as it was before adjustment by correction history.
ttWriter.write(posKey, value_to_tt(bestValue, ss->ply), pvHit,
bestValue >= beta ? BOUND_LOWER : BOUND_UPPER, qsTtDepth, bestMove,
bestValue >= beta ? BOUND_LOWER : BOUND_UPPER, DEPTH_QS, bestMove,
unadjustedStaticEval, tt.generation());
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);