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Add IIR and remove redundant code #1080

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Add IIR and remove redundant code #1080

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9 changes: 5 additions & 4 deletions src/search.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -735,6 +735,11 @@ fn search<NODE: NodeType>(
extension = 1;
}

// Internal Iterative Reductions (IIR)
if depth >= 4 && tt_move.is_null() && !excluded {
depth -= 1;
}
Comment on lines +738 to +741

let mut best_move = Move::NULL;
let mut bound = Bound::Upper;

Expand Down Expand Up @@ -1263,10 +1268,6 @@ fn qsearch<NODE: NodeType>(td: &mut ThreadData, mut alpha: i32, beta: i32, ply:
best_score = lerp(best_score, beta, 0.8256);
}

if entry.is_none() {
td.shared.tt.write(hash, TtDepth::SOME, raw_eval, best_score, Bound::Lower, Move::NULL, ply, tt_pv, false);
}

return best_score;
}
Comment on lines 1268 to 1272

Expand Down