From 5f7b26aaa0d0bbdeb50ea6b17f049f167c1eb996 Mon Sep 17 00:00:00 2001 From: Joost VandeVondele Date: Fri, 19 May 2023 23:02:27 +0200 Subject: [PATCH] Update WLD model using data of May, recalibrate the WLD model. closes https://github.com/official-stockfish/Stockfish/pull/4577 No functional change --- src/uci.cpp | 4 ++-- src/uci.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/uci.cpp b/src/uci.cpp index 8f9684ee..523d551e 100644 --- a/src/uci.cpp +++ b/src/uci.cpp @@ -207,8 +207,8 @@ namespace { // The coefficients of a third-order polynomial fit is based on the fishtest data // for two parameters that need to transform eval to the argument of a logistic // function. - constexpr double as[] = { 0.33677609, -4.30175627, 33.08810557, 365.60223431}; - constexpr double bs[] = { -2.50471102, 14.23235405, -14.33066859, 71.42705250 }; + constexpr double as[] = { 1.07390458, -6.94334517, 31.95090161, 317.75424048}; + constexpr double bs[] = { -2.82843814, 16.64518180, -19.74439200, 68.39499088 }; // Enforce that NormalizeToPawnValue corresponds to a 50% win rate at ply 64 static_assert(UCI::NormalizeToPawnValue == int(as[0] + as[1] + as[2] + as[3])); diff --git a/src/uci.h b/src/uci.h index 9ca0ed36..680d2d2c 100644 --- a/src/uci.h +++ b/src/uci.h @@ -35,7 +35,7 @@ namespace UCI { // the win_rate_model() such that Stockfish outputs an advantage of // "100 centipawns" for a position if the engine has a 50% probability to win // from this position in selfplay at fishtest LTC time control. -const int NormalizeToPawnValue = 394; +const int NormalizeToPawnValue = 343; class Option;