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Fix and rescale correction history #426

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Merged
TheRealGioviok merged 3 commits into from
Sep 14, 2026
Merged

Fix and rescale correction history #426

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690517a
Bench: 13439457
TheRealGioviok Sep 14, 2026
c45b83c
Bench: 14786682
TheRealGioviok Sep 14, 2026
ccc934b
Bench: 12757393
TheRealGioviok Sep 14, 2026
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2 changes: 1 addition & 1 deletion src/history.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ constexpr i32 HISTORY_MAX = 16384;
constexpr u64 CORRECTION_HISTORY_ENTRY_NB = 16384;
constexpr i32 CORRECTION_HISTORY_GRAIN = 256;
constexpr i32 CORRECTION_HISTORY_WEIGHT_SCALE = 256;
constexpr i32 CORRECTION_HISTORY_MAX = CORRECTION_HISTORY_GRAIN * 32;
constexpr i32 CORRECTION_HISTORY_MAX = CORRECTION_HISTORY_GRAIN * 64;

namespace Search {
struct Stack;
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2 changes: 1 addition & 1 deletion src/search.cpp
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Expand Up @@ -1089,7 +1089,7 @@ Value Worker::search(
&& !(best_move != Move::none() && (best_move.is_capture() || best_move.is_promotion()))
&& !((bound == Bound::Lower && best_value <= ss->static_eval)
|| (bound == Bound::Upper && best_value >= ss->static_eval))) {
m_td.history.update_correction_history(pos, depth, best_value - raw_eval);
m_td.history.update_correction_history(pos, depth, best_value - ss->static_eval);
}
}

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