let mut active_player = &mut self.player1;
loop {
    ... do stuff with active_player ...

    println!("{} {}", self.player1.last_move(), self.player2.last_move());

    // Switch to next player
}

loop {
    {
        let mut active_player = &mut self.player1;
        // ... do stuff with active_player ...
    }

    println!("{} {}", self.player1.last_move(), self.player2.last_move());

    // Switch to next player
}