From e2e360fcbc02e0ca3329a36766239e7175501103 Mon Sep 17 00:00:00 2001 From: Joona Kiiski Date: Mon, 4 Jan 2010 18:41:24 +0200 Subject: [PATCH] Slow down reductions After testing on Joona QUAD the whole LMR series: Orig - Mod: 335 - 405 (+33 elo) Functionality Signature: 12581900 Signed-off-by: Marco Costalba --- src/search.cpp | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index ee21915d..8a8f9297 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -969,7 +969,7 @@ namespace { && !captureOrPromotion && !move_is_castle(move)) { - double red = ln(RootMoveNumber - MultiPV + 1) * ln(depth / 2) / 3.0; + double red = 0.5 + ln(RootMoveNumber - MultiPV + 1) * ln(depth / 2) / 6.0; if (red >= 1.0) { ss[0].reduction = Depth(int(floor(red * int(OnePly)))); @@ -1226,7 +1226,7 @@ namespace { && !move_is_castle(move) && !move_is_killer(move, ss[ply])) { - double red = ln(moveCount) * ln(depth / 2) / 3.0; + double red = 0.5 + ln(moveCount) * ln(depth / 2) / 6.0; if (red >= 1.0) { ss[ply].reduction = Depth(int(floor(red * int(OnePly)))); @@ -1557,7 +1557,7 @@ namespace { && !move_is_killer(move, ss[ply]) /* && move != ttMove*/) { - double red = ln(moveCount) * ln(depth / 2) / 1.5; + double red = 0.5 + ln(moveCount) * ln(depth / 2) / 3.0; if (red >= 1.0) { ss[ply].reduction = Depth(int(floor(red * int(OnePly)))); @@ -1902,7 +1902,7 @@ namespace { && !move_is_castle(move) && !move_is_killer(move, ss[sp->ply])) { - double red = ln(moveCount) * ln(sp->depth / 2) / 1.5; + double red = 0.5 + ln(moveCount) * ln(sp->depth / 2) / 3.0; if (red >= 1.0) { ss[sp->ply].reduction = Depth(int(floor(red * int(OnePly)))); @@ -2013,7 +2013,7 @@ namespace { && !move_is_castle(move) && !move_is_killer(move, ss[sp->ply])) { - double red = ln(moveCount) * ln(sp->depth / 2) / 3.0; + double red = 0.5 + ln(moveCount) * ln(sp->depth / 2) / 6.0; if (red >= 1.0) { ss[sp->ply].reduction = Depth(int(floor(red * int(OnePly)))); -- 2.39.2