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| author | eug-vs <eugene@eug-vs.xyz> | 2023-01-25 09:34:25 +0300 |
|---|---|---|
| committer | eug-vs <eugene@eug-vs.xyz> | 2023-01-25 09:34:25 +0300 |
| commit | a905ddb6104849d561a2559182d3c09735ebf5ef (patch) | |
| tree | 34b3d2b4876a3747b233d7e1dd0c0b614702ab55 | |
| parent | aabc81cf486d4ffe2696609c0d27e5bfa60c80eb (diff) | |
| download | chessnost-a905ddb6104849d561a2559182d3c09735ebf5ef.tar.gz | |
feat!: check if transposition hash truly matches
| -rw-r--r-- | src/board/engine.rs | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/src/board/engine.rs b/src/board/engine.rs index d550418..b6daacf 100644 --- a/src/board/engine.rs +++ b/src/board/engine.rs @@ -135,7 +135,7 @@ impl Board { match self.transposition_table[(self.hash % TTABLE_SIZE) as usize] { Some(item) => { - if item.node_type == NodeType::PV { + if item.node_type == NodeType::PV && item.hash == self.hash { moves.insert(0, item.best_move); } } @@ -158,13 +158,6 @@ impl Board { self.unmake_move(mov, captured_piece, ep_target_before, castling_rights_before, hash_before); if score >= beta { - self.transposition_table[(self.hash % TTABLE_SIZE) as usize] = Some(TranspositionTableItem { - hash: self.hash, - best_move: mov, - depth: depth_left, // TODO: should be actual depth searched - node_type: NodeType::Cut, - score, - }); return (beta, principal_variation); } if score > alpha { @@ -172,6 +165,14 @@ impl Board { principal_variation = Vec::with_capacity(depth_left as usize); principal_variation.push(mov); principal_variation.append(&mut subtree_pv); + + self.transposition_table[(self.hash % TTABLE_SIZE) as usize] = Some(TranspositionTableItem { + hash: self.hash, + best_move: mov, + depth: depth_left, // TODO: should be actual depth searched + node_type: NodeType::PV, + score, + }); } } else { self.unmake_move(mov, captured_piece, ep_target_before, castling_rights_before, hash_before); @@ -198,7 +199,7 @@ impl Board { match self.transposition_table[(self.hash % TTABLE_SIZE) as usize] { Some(item) => { - if item.node_type == NodeType::PV { + if item.node_type == NodeType::PV && item.hash == self.hash { moves.insert(0, item.best_move); } } |