Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

"Opponent Worsening" in RFP #569

Merged
merged 2 commits into from
Nov 19, 2024
Merged

"Opponent Worsening" in RFP #569

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
f8c00dd
Bench: 2625158
jhonnold Nov 16, 2024
393b5ab
Bench: 2625158
jhonnold Nov 19, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion src/makefile
View file
Open in desktop
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 = 20241113
VERSION = 20241119
MAIN_NETWORK = berserk-d43206fe90e4.nn
EVALFILE = $(MAIN_NETWORK)
DEFS = -DVERSION=\"$(VERSION)\" -DEVALFILE=\"$(EVALFILE)\" -DNDEBUG
Expand Down
3 changes: 2 additions & 1 deletion src/search.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -511,11 +511,12 @@ int Negamax(int alpha, int beta, int depth, int cutnode, ThreadData* thread, PV*
MovePicker mp;
if (!isPV && !inCheck) {
const int opponentHasEasyCapture = !!OpponentsEasyCaptures(board);
const int opponentDeclining = ss->staticEval + (ss - 1)->staticEval > 1;

// Reverse Futility Pruning
// i.e. the static eval is so far above beta we prune
if (depth <= 9 && !ss->skip && eval < TB_WIN_BOUND && eval >= beta &&
eval - 70 * depth + 118 * (improving && !opponentHasEasyCapture) >= beta &&
eval - 70 * depth + 118 * (improving && !opponentHasEasyCapture) + 25 * opponentDeclining >= beta &&
(!hashMove || GetHistory(ss, thread, hashMove) > 11800))
return (eval + beta) / 2;

Expand Down
Loading