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Re-evaluate some small net positions for more accurate evals #5238

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Re-evaluate some small net positions for more accurate evals #5238

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3 changes: 3 additions & 0 deletions src/evaluate.cpp
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Expand Up @@ -62,6 +62,9 @@ Value Eval::evaluate(const Eval::NNUE::Networks& networks,
Value nnue = smallNet ? networks.small.evaluate(pos, &caches.small, true, &nnueComplexity)
: networks.big.evaluate(pos, &caches.big, true, &nnueComplexity);

if (smallNet && (nnue * simpleEval < 0 || std::abs(nnue) < 500))
nnue = networks.big.evaluate(pos, &caches.big, true, &nnueComplexity);

const auto adjustEval = [&](int nnueDiv, int pawnCountConstant, int pawnCountMul,
int npmConstant, int evalDiv, int shufflingConstant) {
// Blend optimism and eval with nnue complexity and material imbalance
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2 changes: 1 addition & 1 deletion src/evaluate.h
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Expand Up @@ -29,7 +29,7 @@ class Position;

namespace Eval {

constexpr inline int SmallNetThreshold = 1274;
constexpr inline int SmallNetThreshold = 1174;

// The default net name MUST follow the format nn-[SHA256 first 12 digits].nnue
// for the build process (profile-build and fishtest) to work. Do not change the
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