From e093339c2fc651eb9b5adeeb3b666b1fcfa7ad42 Mon Sep 17 00:00:00 2001
From: Pieter te Brake <pieterteb@gmail.com>
Date: Wed, 18 Mar 2026 20:42:56 +0100
Subject: [PATCH] Use existing function for removing and placing a piece.

Passed non-regression STC:
```
LLR: 3.33 (-2.94,2.94) <-1.75,0.25>
Total: 359712 W: 93077 L: 93175 D: 173460
Ptnml(0-2): 1088, 39816, 98144, 39722, 1086
```
https://tests.stockfishchess.org/tests/view/69af5e9a6b61ccc788710e31

closes https://github.com/official-stockfish/Stockfish/pull/6667

No functional change
---
 src/position.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/position.cpp b/src/position.cpp
index f9b94b5dd..1a053e632 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1124,9 +1124,8 @@ void Position::undo_move(Move m) {
         assert(type_of(pc) == m.promotion_type());
         assert(type_of(pc) >= KNIGHT && type_of(pc) <= QUEEN);
 
-        remove_piece(to);
         pc = make_piece(us, PAWN);
-        put_piece(pc, to);
+        swap_piece(to, pc);
     }
 
     if (m.type_of() == CASTLING)