From 1d8f118c3e8931676f5dbe967e227c7eedcc4449 Mon Sep 17 00:00:00 2001
From: 87 <dev@87flowers.com>
Date: Sun, 27 Jul 2025 20:15:24 +0100
Subject: [PATCH] Remove unnecessary deque allocation in perft

closes https://github.com/official-stockfish/Stockfish/pull/6182

No functional change.
---
 src/perft.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/perft.h b/src/perft.h
index 229debd40..e249a8e49 100644
--- a/src/perft.h
+++ b/src/perft.h
@@ -56,9 +56,9 @@ uint64_t perft(Position& pos, Depth depth) {
 }
 
 inline uint64_t perft(const std::string& fen, Depth depth, bool isChess960) {
-    StateListPtr states(new std::deque<StateInfo>(1));
-    Position     p;
-    p.set(fen, isChess960, &states->back());
+    StateInfo st;
+    Position  p;
+    p.set(fen, isChess960, &st);
 
     return perft<true>(p, depth);
 }