diff --git a/chess_uci/src/lib.rs b/chess_uci/src/lib.rs
index 74abb48..d9dfb62 100644
--- a/chess_uci/src/lib.rs
+++ b/chess_uci/src/lib.rs
@@ -54,10 +54,10 @@ pub enum UciOption {
     UCIElo { value: Option<u32> },
 }
 
-#[derive(Clone, Copy)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
 pub enum Player {
     Human { elo: Option<u32> },
-    Machine { elo: Option<u32> },
+    Engine { elo: Option<u32> },
 }
 pub enum GameOption {
     WhiteTotalTime { value: Option<Duration> },
@@ -129,6 +129,10 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
         old_value
     }
 
+    pub fn get_player(&self, color: Color) -> Player {
+        self.player[color.to_index()]
+    }
+
     /// Launch uci engine initialisation
     ///
     /// Retrieve data from uci engine (until uciok command from engine)
@@ -149,6 +153,7 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
     pub fn new_game(&mut self) {
         self.initial = Board::default();
         self.game = Game::new_with_board(self.initial);
+        self.push(GuiCommand::Stop);
         self.push(GuiCommand::UciNewGame);
     }
 
@@ -326,14 +331,14 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
                     Err("Invalid move for human player")
                 }
             }
-            Player::Machine { .. } => Err("Not a human to play for current color."),
+            Player::Engine { .. } => Err("Not a human to play for current color."),
         }
     }
 
     pub fn go(&mut self) -> Result<(), &'static str> {
         match self.player[self.side_to_move().to_index()] {
             Player::Human { .. } => Err("Not a machine to play for current color."),
-            Player::Machine { elo } => {
+            Player::Engine { elo } => {
                 if self.is_uciok() {
                     if let Some(elo) = elo {
                         self.push(GuiCommand::SetOption {
@@ -362,7 +367,7 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
     pub fn stop(&mut self) -> Result<(), &'static str> {
         match self.player[self.side_to_move().to_index()] {
             Player::Human { .. } => Err("Not a machine to play for current color."),
-            Player::Machine { .. } => {
+            Player::Engine { .. } => {
                 self.push(GuiCommand::Stop);
                 Ok(())
             }
diff --git a/chess_uci_demo/src/main.rs b/chess_uci_demo/src/main.rs
index 2376677..d4baf99 100644
--- a/chess_uci_demo/src/main.rs
+++ b/chess_uci_demo/src/main.rs
@@ -32,7 +32,7 @@ pub fn main() {
         value: Player::Human { elo: None },
     });
     uci.game_option(GameOption::BlackPlayer {
-        value: Player::Machine { elo: Some(1500) },
+        value: Player::Engine { elo: Some(1500) },
     });
     uci.init();