From 62577a4039e48c55a579edac78dbdbec5d3bf71e Mon Sep 17 00:00:00 2001
From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Fri, 1 Mar 2024 15:28:21 +0100
Subject: [PATCH] Handle invalid promoted piece (#416)

---
 src/position.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/position.cpp b/src/position.cpp
index 023cdfa72..ade4798d1 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -314,7 +314,7 @@ Position& Position::set(const Variant* v, const string& fenStr, bool isChess960,
       }
 
       // Promoted shogi pieces
-      else if (token == '+' && (idx = piece_to_char().find(ss.peek())) != string::npos)
+      else if (token == '+' && (idx = piece_to_char().find(ss.peek())) != string::npos && promoted_piece_type(type_of(Piece(idx))))
       {
           ss >> token;
           put_piece(make_piece(color_of(Piece(idx)), promoted_piece_type(type_of(Piece(idx)))), sq, true, Piece(idx));