Function inanis::engine::search::runner::lmr_can_be_applied

fn lmr_can_be_applied<const PV: bool>(
    context: &mut SearchContext,
    depth: i8,
    move: Move,
    move_index: usize,
    move_score: i16,
    friendly_king_checked: bool,
    enemy_king_checked: bool
) -> bool

The main idea of the late move reduction is to reduce search depth of all quiet moves, which aren’t promising and with high chance won’t improve score. This is the least risky type of pruning (used inside PVS framework which cares about re-search when the move is better than expected), so it’s also applied in PV nodes.

Conditions:

• depth >= lmr_min_depth
• move index >= lmr_pv_min_move_index or move index >= lmr_min_move_index
• move score <= lmr_max_score
• move is quiet
• friendly king is not checked
• enemy king is not checked