Changes

Despite [[Quiescence Search|quiescence search]], where usually winning captures and even some checks are tried at or behind the search horizon, until positions become sufficiently quite, [[Selectivity|selectivity]] of modern chess programs, caused by [[Extensions|extensions]], [[Pruning|pruning]] and [[Reductions|reductions]], notably [[Check Extensions|check extensions]], [[Null Move Pruning|nNMPNMP]] and [[Late Move Reductions|LMR]], leads to bushy, non-uniform [[Search Tree|trees]] where some branches are searched deeper than nominal, but others shallower. A [[Depth Reduction R|depth reduction R]] of multiple plies is often performed in forward pruning techniques like [[Null Move Pruning|null move pruning]] and [[Multi-Cut|multi-cut]].