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Only cut via SNMP under some conditions. #194

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Sep 9, 2024
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Only cut via SNMP under some conditions. #194

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13 changes: 8 additions & 5 deletions src/search.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -790,6 +790,9 @@ impl Board {
// clear out the next set of killer moves.
t.killer_move_table[height + 1] = [None; 2];

let tt_move = tt_hit.and_then(|hit| hit.mov);
let tt_capture = matches!(tt_move, Some(mv) if self.is_capture(mv));

// whole-node pruning techniques:
if !NT::ROOT && !NT::PV && !in_check && excluded.is_none() {
// razoring.
Expand All @@ -808,9 +811,12 @@ impl Board {
// this is a generalisation of stand_pat in quiescence search.
if !t.ss[height].ttpv
&& depth <= info.conf.rfp_depth
&& static_eval - Self::rfp_margin(info, depth, improving) > beta
&& static_eval - Self::rfp_margin(info, depth, improving) >= beta
&& (tt_move.is_none() || tt_capture)
&& beta > -MINIMUM_TB_WIN_SCORE
&& static_eval < MINIMUM_TB_WIN_SCORE
{
return (static_eval + beta) / 2;
return beta + (static_eval - beta) / 3;
}

let last_move_was_null = self.last_move_was_nullmove();
Expand Down Expand Up @@ -863,9 +869,6 @@ impl Board {
}
}

let tt_move = tt_hit.and_then(|hit| hit.mov);
let tt_capture = matches!(tt_move, Some(mv) if self.is_capture(mv));

// TT-reduction (IIR).
if NT::PV && tt_hit.map_or(true, |tte| tte.depth + 4 <= depth) {
depth -= i32::from(depth >= info.conf.tt_reduction_depth);
Expand Down
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