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Search Parameters Tuning

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A simple tuning on search.cpp.

based SPSA test:
https://tests.stockfishchess.org/tests/view/601f2a787f517a561bc493cd

passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 117840 W: 10796 L: 10508 D: 96536
Ptnml(0-2): 422, 8381, 41041, 8639, 437
https://tests.stockfishchess.org/tests/view/602144c37f517a561bc494ae

passed LTC:
LLR: 2.96 (-2.94,2.94) {0.25,1.25}
Total: 25024 W: 972 L: 847 D: 23205
Ptnml(0-2): 7, 767, 10847, 876, 15
https://tests.stockfishchess.org/tests/view/602156877f517a561bc494be

closes https://github.com/official-stockfish/Stockfish/pull/3340

Bench: 3974098
This commit is contained in:
bmc4 2021-02-04 21:50:22 -03:00 • committed by Joost VandeVondele
parent 5ebdc40f83
commit 29ed22de8c
1 changed files with 14 additions and 14 deletions
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28
src/search.cpp
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@ -81,7 +81,7 @@ namespace {
// History and stats update bonus, based on depth
int stat_bonus(Depth d) {
return d > 14 ? 29 : 8 * d * d + 224 * d - 215;
return d > 14 ? 66 : 6 * d * d + 231 * d - 206;
}
// Add a small random component to draw evaluations to avoid 3-fold blindness
@ -839,10 +839,10 @@ namespace {
// Step 8. Null move search with verification search (~40 Elo)
if ( !PvNode
&& (ss-1)->currentMove != MOVE_NULL
&& (ss-1)->statScore < 22977
&& (ss-1)->statScore < 22661
&& eval >= beta
&& eval >= ss->staticEval
&& ss->staticEval >= beta - 30 * depth - 28 * improving + 84 * ss->ttPv + 168
&& ss->staticEval >= beta - 24 * depth - 34 * improving + 162 * ss->ttPv + 159
&& !excludedMove
&& pos.non_pawn_material(us)
&& (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))
@ -850,7 +850,7 @@ namespace {
assert(eval - beta >= 0);
// Null move dynamic reduction based on depth and value
Depth R = (1015 + 85 * depth) / 256 + std::min(int(eval - beta) / 191, 3);
Depth R = (1062 + 68 * depth) / 256 + std::min(int(eval - beta) / 190, 3);
ss->currentMove = MOVE_NULL;
ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];
@ -886,7 +886,7 @@ namespace {
}
}
probCutBeta = beta + 194 - 49 * improving;
probCutBeta = beta + 209 - 44 * improving;
// Step 9. ProbCut (~10 Elo)
// If we have a good enough capture and a reduced search returns a value
@ -1063,11 +1063,11 @@ moves_loop: // When in check, search starts from here
// Futility pruning: parent node (~5 Elo)
if ( lmrDepth < 7
&& !ss->inCheck
&& ss->staticEval + 254 + 159 * lmrDepth <= alpha
&& ss->staticEval + 174 + 157 * lmrDepth <= alpha
&& (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)]
+ (*contHist[5])[movedPiece][to_sq(move)] / 2 < 26394)
+ (*contHist[5])[movedPiece][to_sq(move)] / 3 < 26237)
continue;
// Prune moves with negative SEE (~20 Elo)
@ -1223,13 +1223,13 @@ moves_loop: // When in check, search starts from here
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)]
- 5287;
- 5337;
// Decrease/increase reduction by comparing opponent's stat score (~10 Elo)
if (ss->statScore >= -105 && (ss-1)->statScore < -103)
if (ss->statScore >= -89 && (ss-1)->statScore < -116)
r--;
else if ((ss-1)->statScore >= -122 && ss->statScore < -129)
else if ((ss-1)->statScore >= -112 && ss->statScore < -100)
r++;
// Decrease/increase reduction for moves with a good/bad history (~30 Elo)
@ -1237,9 +1237,9 @@ moves_loop: // When in check, search starts from here
// use sum of main history and first continuation history with an offset
if (ss->inCheck)
r -= (thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)] - 4333) / 16384;
+ (*contHist[0])[movedPiece][to_sq(move)] - 4341) / 16384;
else
r -= ss->statScore / 14884;
r -= ss->statScore / 14382;
}
Depth d = std::clamp(newDepth - r, 1, newDepth);
@ -1711,8 +1711,8 @@ moves_loop: // When in check, search starts from here
PieceType captured = type_of(pos.piece_on(to_sq(bestMove)));
bonus1 = stat_bonus(depth + 1);
bonus2 = bestValue > beta + PawnValueMg ? bonus1 // larger bonus
: stat_bonus(depth); // smaller bonus
bonus2 = bestValue > beta + PawnValueMg ? bonus1 // larger bonus
: std::min(bonus1, stat_bonus(depth)); // smaller bonus
if (!pos.capture_or_promotion(bestMove))
{