From 9a42bbdf3163222db5e0fa764d48ca0a09a0dec2 Mon Sep 17 00:00:00 2001 From: FauziAkram Date: Tue, 4 Apr 2023 14:26:29 +0300 Subject: [PATCH] Parameters Tweak Passed STC LLR: 3.22 (-2.94,2.94) <0.00,2.00> Total: 664048 W: 177526 L: 176301 D: 310221 Ptnml(0-2): 2002, 72968, 180891, 74129, 2034 https://tests.stockfishchess.org/tests/view/64219901db43ab2ba6f901fa Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 77576 W: 21125 L: 20750 D: 35701 Ptnml(0-2): 24, 7350, 23669, 7717, 28 https://tests.stockfishchess.org/tests/view/642abe3377ff3301150d3a16 closes https://github.com/official-stockfish/Stockfish/pull/4493 bench: 4522076 --- src/search.cpp | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index becaee3a..749de792 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -72,7 +72,7 @@ namespace { Depth reduction(bool i, Depth d, int mn, Value delta, Value rootDelta) { int r = Reductions[d] * Reductions[mn]; - return (r + 1449 - int(delta) * 1032 / int(rootDelta)) / 1024 + (!i && r > 941); + return (r + 1449 - int(delta) * 1001 / int(rootDelta)) / 1024 + (!i && r > 941); } constexpr int futility_move_count(bool improving, Depth depth) { @@ -82,7 +82,7 @@ namespace { // History and stats update bonus, based on depth int stat_bonus(Depth d) { - return std::min(340 * d - 470, 1855); + return std::min(341 * d - 470, 1855); } // Add a small random component to draw evaluations to avoid 3-fold blindness @@ -1057,7 +1057,7 @@ moves_loop: // When in check, search starts here lmrDepth = std::max(lmrDepth, 0); // Prune moves with negative SEE (~4 Elo) - if (!pos.see_ge(move, Value(-24 * lmrDepth * lmrDepth - 15 * lmrDepth))) + if (!pos.see_ge(move, Value(-24 * lmrDepth * lmrDepth - 16 * lmrDepth))) continue; } } @@ -1193,10 +1193,10 @@ moves_loop: // When in check, search starts here + (*contHist[0])[movedPiece][to_sq(move)] + (*contHist[1])[movedPiece][to_sq(move)] + (*contHist[3])[movedPiece][to_sq(move)] - - 4182; + - 4082; // Decrease/increase reduction for moves with a good/bad history (~25 Elo) - r -= ss->statScore / (11791 + 3992 * (depth > 6 && depth < 19)); + r -= ss->statScore / (11079 + 4626 * (depth > 6 && depth < 19)); // Step 17. Late moves reduction / extension (LMR, ~117 Elo) // We use various heuristics for the sons of a node after the first son has -- 2.39.2