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Apply minor fixes to FP (still untested)

This commit is contained in:
Mattia Giambirtone 2024-05-10 14:29:47 +02:00
parent fdf71bbfce
commit 2f39e42448
1 changed files with 4 additions and 4 deletions
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8
Chess/nimfish/nimfishpkg/search.nim
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@ -51,10 +51,10 @@ const
# Constants to configure FP
# (Futility pruning)
# Limit after which FP is disabled
FP_DEPTH_LIMIT = 1
# Limit after which FP is disabled (TODO)
FP_DEPTH_LIMIT {.used.} = 1
# Advantage threshold
FP_EVAL_MARGIN = 125
FP_EVAL_MARGIN {.used.} = 250
NUM_KILLERS* = 2
MAX_DEPTH* = 255
@ -469,7 +469,7 @@ proc search(self: var SearchManager, depth, ply: int, alpha, beta: Score, isPV:
if ply == 0 and self.searchMoves.len() > 0 and move notin self.searchMoves:
continue
when defined(FP):
if not isPV and depth <= FP_DEPTH_LIMIT and staticEval + FP_EVAL_MARGIN * depth < alpha and bestScore > mateScore() - MAX_DEPTH:
if not isPV and move.isQuiet() and depth <= FP_DEPTH_LIMIT and staticEval + FP_EVAL_MARGIN * depth < alpha and bestScore > mateScore() + MAX_DEPTH:
# Futility pruning: If a move cannot meaningfully improve alpha, prune it from the
# tree. Much like RFP, this is an unsound optimization (and a riskier one at that,
# apparently), so our depth limit and evaluation margins are very conservative