From 0024133b08777b578c1036eb1e4a36343b7fa1bb Mon Sep 17 00:00:00 2001 From: Linmiao Xu Date: Sun, 22 Oct 2023 12:59:21 -0400 Subject: [PATCH] Update 5 search params for pruning at shallow depth Found by spsa tuning at 45+0.45 with: ``` int fpcEvalOffset = 188; int fpcLmrDepthMult = 206; int histDepthMult = -3232; int histDenom = 5793; int fpEvalOffset = 115; int negSeeDepthMultSq = -27; TUNE(SetRange(0, 394), fpcEvalOffset); TUNE(SetRange(0, 412), fpcLmrDepthMult); TUNE(SetRange(-6464, -1616), histDepthMult); TUNE(SetRange(2896, 11586), histDenom); TUNE(SetRange(0, 230), fpEvalOffset); TUNE(SetRange(-54, 0), negSeeDepthMultSq); ``` Passed STC: https://tests.stockfishchess.org/tests/view/6535551de746e058e6c0165d LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 109056 W: 28025 L: 27599 D: 53432 Ptnml(0-2): 357, 12669, 28038, 13119, 345 Passed LTC: https://tests.stockfishchess.org/tests/view/65364c6ff127f3553505175d LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 61290 W: 15316 L: 14941 D: 31033 Ptnml(0-2): 34, 6849, 16498, 7236, 28 closes https://github.com/official-stockfish/Stockfish/pull/4847 bench 1167412 --- src/search.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index ad4b458e..9cef7e5f 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -974,7 +974,7 @@ moves_loop: // When in check, search starts here { Piece capturedPiece = pos.piece_on(to_sq(move)); int futilityEval = - ss->staticEval + 188 + 206 * lmrDepth + PieceValue[capturedPiece] + ss->staticEval + 239 + 291 * lmrDepth + PieceValue[capturedPiece] + captureHistory[movedPiece][to_sq(move)][type_of(capturedPiece)] / 7; if (futilityEval < alpha) continue; @@ -991,16 +991,16 @@ moves_loop: // When in check, search starts here + (*contHist[3])[movedPiece][to_sq(move)]; // Continuation history based pruning (~2 Elo) - if (lmrDepth < 6 && history < -3232 * depth) + if (lmrDepth < 6 && history < -3498 * depth) continue; history += 2 * thisThread->mainHistory[us][from_to(move)]; - lmrDepth += history / 5793; + lmrDepth += history / 7815; lmrDepth = std::max(lmrDepth, -2); // Futility pruning: parent node (~13 Elo) - if (!ss->inCheck && lmrDepth < 13 && ss->staticEval + 115 + 122 * lmrDepth <= alpha) + if (!ss->inCheck && lmrDepth < 13 && ss->staticEval + 80 + 122 * lmrDepth <= alpha) continue; lmrDepth = std::max(lmrDepth, 0); -- 2.39.2