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Merge commit 'a2a7edf4c8fa145667135bf1bc7f4f67016f7608' into cluster

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This is the last commit before there are more conflicts.
This commit is contained in:
Steinar H. Gunderson
2025-12-24 16:19:29 +01:00
parent bc81aa0911 a2a7edf4c8
commit 784db2cbed
14 changed files with 396 additions and 273 deletions
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src/uci.cpp
+6 -6
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@@ -389,12 +389,12 @@ WinRateParams win_rate_params(const Position& pos) {
int material = pos.count<PAWN>() + 3 * pos.count<KNIGHT>() + 3 * pos.count<BISHOP>()
+ 5 * pos.count<ROOK>() + 9 * pos.count<QUEEN>();
// The fitted model only uses data for material counts in [10, 78], and is anchored at count 58.
double m = std::clamp(material, 10, 78) / 58.0;
// The fitted model only uses data for material counts in [17, 78], and is anchored at count 58.
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[] = {-150.77043883, 394.96159472, -321.73403766, 406.15850091};
constexpr double bs[] = {62.33245393, -91.02264855, 45.88486850, 51.63461272};
constexpr double as[] = {-41.25712052, 121.47473115, -124.46958843, 411.84490997};
constexpr double bs[] = {84.92998051, -143.66658718, 80.09988253, 49.80869370};
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];
@@ -435,8 +435,8 @@ std::string UCIEngine::format_score(const Score& s) {
// without treatment of mate and similar special scores.
int UCIEngine::to_cp(Value v, const Position& pos) {
// In general, the score can be defined via the the WDL as
// (log(1/L - 1) - log(1/W - 1)) / ((log(1/L - 1) + log(1/W - 1))
// In general, the score can be defined via the WDL as
// (log(1/L - 1) - log(1/W - 1)) / (log(1/L - 1) + log(1/W - 1)).
// Based on our win_rate_model, this simply yields v / a.
auto [a, b] = win_rate_params(pos);