From f8d1315d90257c017baddabc27445b518401aa8a Mon Sep 17 00:00:00 2001
From: Tomasz Sobczyk <tomasz.sobczyk1997@gmail.com>
Date: Thu, 2 Sep 2021 21:31:28 +0200
Subject: [PATCH] Fix uninitialized ss->ply in data generator

---
 src/search.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/search.cpp b/src/search.cpp
index b4b3303b..a811deda 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1978,6 +1978,9 @@ namespace Search
       for (int i = 7; i > 0; i--)
           (ss - i)->continuationHistory = &th->continuationHistory[0][0][NO_PIECE][0]; // Use as a sentinel
 
+      for (int i = 0; i <= MAX_PLY + 2; ++i)
+          (ss + i)->ply = i;
+
       // set rootMoves
       auto& rootMoves = th->rootMoves;