disable razoring when try to find shorter win

test f20, s15, r15
dhbloo · Jul 16, 2024 · 38a2759 · 38a2759
1 parent 77b33dd
commit 38a2759
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/Rapfi/search/ab/search.cpp b/Rapfi/search/ab/search.cpp
@@ -834,7 +834,8 @@ Value search(Board &board, SearchStack *ss, Value alpha, Value beta, Depth depth
     }
 
     // Step 7. Razoring with VCF (~55 elo)
-    if (!PvNode && eval + razorMargin<Rule>(depth) < alpha) {
+    if (!PvNode && alpha < VALUE_MATE_IN_MAX_PLY  // We are not searching for a short win
+        && eval + razorMargin<Rule>(depth) < alpha) {
         return vcfsearch<Rule, NonPV>(board, ss, alpha, alpha + 1);
     }