From 536f6b8b3467e5b0a15bce29b7375e1e2a0cc2d6 Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Wed, 26 Apr 2023 19:02:42 +0100
Subject: [PATCH] ChessEngine: Reset the engine state on receiving a ucinewgame
 command

---
 Userland/Services/ChessEngine/ChessEngine.cpp | 6 ++++++
 Userland/Services/ChessEngine/ChessEngine.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/Userland/Services/ChessEngine/ChessEngine.cpp b/Userland/Services/ChessEngine/ChessEngine.cpp
index b1195590a1..e68e45e67b 100644
--- a/Userland/Services/ChessEngine/ChessEngine.cpp
+++ b/Userland/Services/ChessEngine/ChessEngine.cpp
@@ -74,3 +74,9 @@ void ChessEngine::handle_unexpected_eof()
     if (on_quit)
         on_quit(EPIPE);
 }
+
+void ChessEngine::handle_ucinewgame()
+{
+    m_board = Chess::Board();
+    m_last_tree = {};
+}
diff --git a/Userland/Services/ChessEngine/ChessEngine.h b/Userland/Services/ChessEngine/ChessEngine.h
index 1ffd6ea237..9afc0fc394 100644
--- a/Userland/Services/ChessEngine/ChessEngine.h
+++ b/Userland/Services/ChessEngine/ChessEngine.h
@@ -19,6 +19,7 @@ public:
     virtual void handle_position(Chess::UCI::PositionCommand const&) override;
     virtual void handle_go(Chess::UCI::GoCommand const&) override;
     virtual void handle_quit() override;
+    virtual void handle_ucinewgame() override;
     virtual void handle_unexpected_eof() override;
 
     Function<void(int)> on_quit;