diff --git a/chess_uci/src/lib.rs b/chess_uci/src/lib.rs
index 46b921b..26a4ce7 100644
--- a/chess_uci/src/lib.rs
+++ b/chess_uci/src/lib.rs
@@ -140,31 +140,34 @@ impl<Fi: Read, Fo:  Write> UciEngine<Fi, Fo> {
     ///
     /// if `EngineCommand::Id`: update name or authorship of the engine
     /// if `EngineCommand::UciOk`: end engine initialization phase
-    pub fn exec(&mut self, command: &str){
-        match parse (&mut command.to_string()) {
+    pub fn exec(&mut self, command: &str) -> std::result::Result<EngineCommand, &'static str> {
+        let uci_command = parse (&mut command.to_string());
+        match  uci_command.clone() {
             Ok(EngineCommand::Id{id}) => self.update(&id),
             Ok(EngineCommand::UciOk) => self.uciok(),
             Ok(EngineCommand::Opt { options: _ }) => {},
             Ok(_) => {unimplemented!("command not implemented")},
             Err(_) => warn!("Not a command"),
-        }
+        };
+        uci_command
     }
 
     /// Retrieve a line from the uci engine input stream and parse it
-    pub fn pull(&mut self) {
+    pub fn pull(&mut self) -> Option<EngineCommand> {
 
         if let Some(source) = &mut self.source {
             let mut command = String::new();
             match source.read_line(&mut command) {
-                Ok(0) => self.terminate("Chess engine closed connection."),
+                Ok(0) => {self.terminate("Chess engine closed connection."); None},
                 Ok(_) => {
                     info!("← {}", command);
-                    self.exec(&command)
+                    self.exec(&command).ok()
                 },
-                Err(reason) => warn!("Unable to read from engine: {reason}"),
+                Err(reason) => {warn!("Unable to read from engine: {reason}"); None},
             }
         } else {
             info!("❌ No connected uci engine");
+            None
         }
     }
 
diff --git a/chess_uci/src/uci_command.rs b/chess_uci/src/uci_command.rs
index 9e76bf1..d702eed 100644
--- a/chess_uci/src/uci_command.rs
+++ b/chess_uci/src/uci_command.rs
@@ -6,6 +6,7 @@ use chess::{ChessMove, Board, Action};
 
 mod uci_command{}
 
+#[derive(Clone)]
 pub struct Id {name: Option<String>, author: Option<String>}
 impl Id {
     pub fn new() -> Id {
@@ -30,11 +31,12 @@ impl Id {
         self.author.clone()
     }
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Info {}
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Opt{}
 
+#[derive(Clone)]
 pub enum EngineCommand {
     Id{id: Id},
     UciOk,