diff --git a/src/main.rs b/src/main.rs
index 59b0158..6705233 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,9 @@ use util::{Player, Symb};
 
 fn play(
 	maxi: &mut dyn agents::MaximizerAgent,
+	maxi_player: Player,
 	mini: &mut dyn agents::MinimizerAgent,
+	mini_player: Player,
 ) -> Result<Board> {
 	let mut board = Board::new();
 	let mut is_first_turn = true;
@@ -32,18 +34,19 @@ fn play(
 		} else {
 			mini.step_min(&board)?
 		};
-		is_maxi_turn = !is_maxi_turn;
 
 		if !board.play(
 			action,
 			if is_maxi_turn {
-				Player::Human
+				maxi_player
 			} else {
-				Player::Computer
+				mini_player
 			},
 		) {
 			bail!("agent made invalid move")
 		}
+
+		is_maxi_turn = !is_maxi_turn;
 	}
 
 	println!("\r{}║{}║", " ".repeat(6), board,);
@@ -52,10 +55,15 @@ fn play(
 }
 
 fn main() -> Result<()> {
+	rayon::ThreadPoolBuilder::new()
+		.num_threads(4)
+		.build_global()
+		.unwrap();
+
 	let mut maxi = agents::PlayerAgent::new(Player::Human);
 	let mut mini = agents::MinMaxTree {};
 
-	let a = play(&mut maxi, &mut mini)?;
+	let a = play(&mut maxi, Player::Human, &mut mini, Player::Computer)?;
 	if a.is_done() {
 		println!(
 			"\r\n{}Your score:{} {:.2}\n\n",