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| author | eug-vs <eugene@eug-vs.xyz> | 2024-01-18 22:12:38 +0100 |
|---|---|---|
| committer | eug-vs <eugene@eug-vs.xyz> | 2024-01-18 22:12:38 +0100 |
| commit | c101f2e230a2ed021ce54d6278ce120ad6d850fe (patch) | |
| tree | b2a94c6c20186176a82140b67325de6c9cfc537a /src/grossmeister/search.rs | |
| parent | ef1d62f64e3a52c371c29fea8cca400fde86a457 (diff) | |
| download | chessnost-c101f2e230a2ed021ce54d6278ce120ad6d850fe.tar.gz | |
fix: clamp score to keep it inside the window
Diffstat (limited to 'src/grossmeister/search.rs')
| -rw-r--r-- | src/grossmeister/search.rs | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/src/grossmeister/search.rs b/src/grossmeister/search.rs index 0ca5ef4..c195527 100644 --- a/src/grossmeister/search.rs +++ b/src/grossmeister/search.rs @@ -50,18 +50,20 @@ impl Grossmeister { if let Some(transposition) = self.transposition() { if transposition.depth >= depth_left { match transposition.node_type { - NodeType::PV | NodeType::Cut => { + NodeType::PV => { + return transposition.score.clamp(alpha, beta); + } + NodeType::Cut => { if transposition.score >= beta { - return beta - } - if transposition.score > alpha { - alpha = transposition.score + return beta; } + alpha = transposition.score.clamp(alpha, beta); } NodeType::All => { if transposition.score <= alpha { - return alpha + return alpha; } + beta = transposition.score.clamp(alpha, beta); } } } @@ -171,18 +173,20 @@ impl Grossmeister { if let Some(transposition) = self.transposition() { match transposition.node_type { - NodeType::PV | NodeType::Cut => { + NodeType::PV => { + return transposition.score.clamp(alpha, beta); + } + NodeType::Cut => { if transposition.score >= beta { - return beta - } - if transposition.score > alpha { - alpha = transposition.score + return beta; } + alpha = transposition.score.clamp(alpha, beta); } NodeType::All => { if transposition.score <= alpha { - return alpha + return alpha; } + beta = transposition.score.clamp(alpha, beta); } } } |