From: Joost VandeVondele <Joost.VandeVondele@gmail.com>
Date: Sun, 31 Jul 2022 12:58:13 +0000 (+0200)
Subject: Update WDL model for current SF
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;ds=sidebyside;h=e639c4557786513018f625ff96f04b63157a85c1;p=stockfish

Update WDL model for current SF

This updates the WDL model based on the LTC statistics for the two weeks (3M games).

for old results see:

https://github.com/official-stockfish/Stockfish/pull/3981
https://github.com/official-stockfish/Stockfish/pull/3582
https://github.com/official-stockfish/Stockfish/pull/2778

closes https://github.com/official-stockfish/Stockfish/pull/4115

No functional change.
---

diff --git a/src/uci.cpp b/src/uci.cpp
index c0bacfaf..ec106ee9 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.
-     double as[] = {-1.17202460e-01, 5.94729104e-01, 1.12065546e+01, 1.22606222e+02};
-     double bs[] = {-1.79066759,  11.30759193, -17.43677612,  36.47147479};
+     double as[] = { 0.50379905,  -4.12755858,  18.95487051, 152.00733652};
+     double bs[] = {-1.71790378,  10.71543602, -17.05515898,  41.15680404};
      double a = (((as[0] * m + as[1]) * m + as[2]) * m) + as[3];
      double b = (((bs[0] * m + bs[1]) * m + bs[2]) * m) + bs[3];