reduce depth on tt miss

brunocodutra · Sep 16, 2023 · c26aaf7 · c26aaf7
1 parent da7ff9f
commit c26aaf7
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/lib/search/engine.rs b/lib/search/engine.rs
@@ -166,6 +166,13 @@ impl Engine {
             };
         }
 
+        let depth = match tpos {
+            #[cfg(not(test))]
+            // Reductions are not exact.
+            None => depth - 1,
+            _ => depth,
+        };
+
         let score = match tpos {
             Some(t) => t.score().normalize(ply),
             None if ply >= depth => pos.value().cast(),