From ef4751f50fcc6d588f29ec498eba102af5c86c56 Mon Sep 17 00:00:00 2001
From: dhb <1084714805@qq.com>
Date: Mon, 14 Oct 2024 02:55:14 +0800
Subject: [PATCH] evaluate leaf value before vcf

test f15
---
 Rapfi/search/ab/search.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Rapfi/search/ab/search.cpp b/Rapfi/search/ab/search.cpp
index d9f78e6..f3c4a64 100644
--- a/Rapfi/search/ab/search.cpp
+++ b/Rapfi/search/ab/search.cpp
@@ -640,6 +640,17 @@ Value search(Board &board, SearchStack *ss, Value alpha, Value beta, Depth depth
 
     // Dive into vcf search when the depth reaches zero (~17 elo)
     if (depth <= 0.0f) {
+        Value leafValue = Evaluation::evaluate<Rule>(board, alpha, beta);
+
+        // Update bound using standing pat
+        if (oppo5)
+            beta = std::min(beta, leafValue);
+        else
+            alpha = std::max(alpha, leafValue);
+        // Prune directly if the value is already outside the window
+        if (alpha >= beta)
+            return alpha;
+
         return oppo5 ? vcfdefend<Rule, NT>(board, ss, alpha, beta)
                      : vcfsearch<Rule, NT>(board, ss, alpha, beta);
     }