diff --git a/src/game.rs b/src/game.rs
index cbe23e5..0950e18 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,4 +1,4 @@
-use crate::{agent::Agent, board::Board};
+use crate::{agent::Agent, board::Board, piece::Piece};
 
 pub struct Game {
     players: [Box<dyn Agent>; 2],
@@ -21,7 +21,19 @@ impl std::fmt::Display for Game {
 }
 
 impl Game {
-    pub const fn new(player1: Box<dyn Agent>, player2: Box<dyn Agent>) -> Self {
+    pub fn new(player1: Box<dyn Agent>, player2: Box<dyn Agent>) -> Self {
+        let player1_color = player1.color();
+        let player2_color = player2.color();
+        assert_ne!(
+            player1_color,
+            player2_color,
+            "Both players cannot have the same color {}",
+            player1_color.text()
+        );
+
+        assert_eq!(player1_color, Piece::Black, "player 1 must playing black");
+        assert_eq!(player2_color, Piece::White, "player 2 must play white");
+
         Self {
             players: [player1, player2],
             board: Board::new().starting_pos(),
@@ -54,10 +66,13 @@ impl Game {
             } else {
                 println!("Player {} did not make a move!", player_i);
                 // players are able to skip a move if they have no valid moves to make
-                assert!(
-                    !self.board.possible_moves(player_color).any(|_| true),
-                    "Player skipped a move, but they had a possible move to make"
-                );
+                if self.board.possible_moves(player_color).any(|_| true) {
+                    println!(
+                        "Player {} has possible moves, but skipped (invalid)",
+                        player_i
+                    );
+                    continue;
+                }
                 return; // No valid move available
             }
         }
@@ -69,7 +84,7 @@ impl Game {
 
         loop {
             // alternate which player plays
-            current_player += 1;
+
             current_player %= self.players.len();
 
             println!("{}", self);
@@ -82,6 +97,7 @@ impl Game {
             }
 
             self.step(current_player);
+            current_player += 1;
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 37db162..a0b4902 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,8 +12,8 @@ mod piece;
 fn main() {
     let player1 = complexagent::ComplexAgent::new(Piece::Black);
     // let player2 = complexagent::ComplexAgent::new(Piece::White);
-    // let player2 = agent::ManualAgent::new(Piece::White);
-    let player2 = agent::RandomAgent::new(Piece::White);
+    let player2 = agent::ManualAgent::new(Piece::White);
+    // let player2 = agent::RandomAgent::new(Piece::White);
     let mut game = Game::new(Box::new(player1), Box::new(player2));
     game.game_loop();
 }