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Update the WDL model

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updates the internal WDL model, using data from 2.6M games played by the revisions since 9fb5832.

https://github.com/official-stockfish/Stockfish/pull/5565

No functional change
This commit is contained in:
Robert Nurnberg @ elitebook 2024-09-03 08:20:06 +02:00 • committed by Joost VandeVondele
parent ab00c24c7e
commit 2054add23c
1 changed files with 2 additions and 2 deletions
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src/uci.cpp
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@ -339,8 +339,8 @@ WinRateParams win_rate_params(const Position& pos) {
double m = std::clamp(material, 17, 78) / 58.0;
// Return a = p_a(material) and b = p_b(material), see github.com/official-stockfish/WDL_model
constexpr double as[] = {-41.25712052, 121.47473115, -124.46958843, 411.84490997};
constexpr double bs[] = {84.92998051, -143.66658718, 80.09988253, 49.80869370};
constexpr double as[] = {-37.45051876, 121.19101539, -132.78783573, 420.70576692};
constexpr double bs[] = {90.26261072, -137.26549898, 71.10130540, 51.35259597};
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];