From 2c234cee388cda5dcb05b8f862b9855bb714bc1e Mon Sep 17 00:00:00 2001
From: eug-vs <eugene@eug-vs.xyz>
Date: Sun, 29 Jan 2023 17:32:16 +0300
Subject: fix: remove search instability

Strictly check depth when comparing transposition table entry
---
 src/board/engine.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/board')

diff --git a/src/board/engine.rs b/src/board/engine.rs
index 95d7145..a87e8b0 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -283,7 +283,7 @@ impl Board {
 
         match self.transposition() {
             Some(transposition) => {
-                if transposition.depth >= depth_left {
+                if transposition.depth == depth_left {
                     match transposition.node_type {
                         NodeType::PV => { // PV-nodes have exact score
                             principal_variation.push(transposition.mov);
-- 
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