half fail high reduction for H_FLEX3 moves

test r15
dhbloo · Jun 13, 2024 · 67b194f · 67b194f
1 parent fa863d2
commit 67b194f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/Rapfi/search/ab/search.cpp b/Rapfi/search/ab/search.cpp
@@ -1076,13 +1076,15 @@ Value search(Board &board, SearchStack *ss, Value alpha, Value beta, Depth depth
                 extension += (distSelf <= 4 ? 0.20f : 0.05f);
         }
 
-        // Fail high reduction
+        // Fail High Reduction/Extension
         if (likelyFailHigh) {
             if (ss->moveP4[self] >= E_BLOCK4) {
                 // If we failed high for two continous E_BLOCK4 moves, extend rather than reduce
                 if ((ss - 2)->moveP4[self] >= E_BLOCK4)
                     extension += 1.0f;
             }
+            else if (ss->moveP4[self] >= H_FLEX3)
+                extension -= 0.5f;
             else
                 extension -= 1.0f;
         }