Extend see assisted futility pruning to higher depths

Deeper SEE pruning
jnlt3 · Jan 14, 2022 · 8bd8c5b · 8bd8c5b
2 parents 28333be + 3d5d66a
commit 8bd8c5b
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/bm/bm_search/search.rs b/src/bm/bm_search/search.rs
@@ -398,9 +398,11 @@ pub fn search<Search: SearchType>(
             In non-PV nodes If a move evaluated by SEE isn't good enough to beat alpha - a static margin
             we assume it's safe to prune this move
             */
-            let do_see_prune = !Search::PV && !in_check && depth <= 2;
+            let do_see_prune = !Search::PV && !in_check && depth <= 7;
             if do_see_prune
-                && eval + StdEvaluator::see::<16>(&board, make_move) + SEARCH_PARAMS.get_fp()
+                && eval
+                    + StdEvaluator::see::<16>(&board, make_move)
+                    + SEARCH_PARAMS.get_fp() * (depth as i16)
                     < alpha
             {
                 continue;