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Average out fail highs in QS #544

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merged 2 commits into from
Feb 21, 2024
Merged

Average out fail highs in QS #544

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2ca581f
Bench: 2356639
jhonnold Feb 20, 2024
33e85e6
Bench: 2356639
jhonnold Feb 21, 2024
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2 changes: 1 addition & 1 deletion src/makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ EXE = berserk
SRC = attacks.c bench.c berserk.c bits.c board.c eval.c history.c move.c movegen.c movepick.c perft.c random.c \
search.c see.c tb.c thread.c transposition.c uci.c util.c zobrist.c nn/accumulator.c nn/evaluate.c pyrrhic/tbprobe.c
CC = clang
VERSION = 20240220
VERSION = 20240221
MAIN_NETWORK = berserk-da85741a5582.nn
EVALFILE = $(MAIN_NETWORK)
DEFS = -DVERSION=\"$(VERSION)\" -DEVALFILE=\"$(EVALFILE)\" -DNDEBUG
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3 changes: 3 additions & 0 deletions src/search.c
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Expand Up @@ -950,6 +950,9 @@ int Quiesce(int alpha, int beta, int depth, ThreadData* thread, SearchStack* ss)
if (!legalMoves && inCheck)
return -CHECKMATE + ss->ply;

if (bestScore >= beta && abs(bestScore) < TB_WIN_BOUND)
bestScore = (bestScore + beta) / 2;

int bound = bestScore >= beta ? BOUND_LOWER : BOUND_UPPER;
TTPut(tt, board->zobrist, 0, bestScore, bound, bestMove, ss->ply, rawEval, ttPv);

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