allow the game to end in cases of a non-full board

src/board.rs

@@ -48,14 +48,6 @@ impl fmt::Display for Board {
             white_score, black_score
         )?;
 
-        // Print game over screen
-        if self.game_over() {
-            match self.get_winner() {
-                Some(piece) => writeln!(f, "{} Wins", piece.text()),
-                None => writeln!(f, "Tie"),
-            }?
-        }
-
         Ok(())
     }
 }
@@ -207,24 +199,24 @@ impl Board {
             .fold((0_usize, 0usize), |(a, b), (c, d)| (a + c, b + d))
     }
 
-    // Get the winning piece (for game over screen mainly)
-    pub fn get_winner(&self) -> Option<Piece> {
+    pub fn game_winner(&self, turn: Piece) -> Option<Piece> {
         let (white_score, black_score) = self.get_score();
+        let max_score = BOARD_SIZE * BOARD_SIZE;
+        let combined_score = black_score + white_score;
+        if max_score != combined_score {
+            return None;
+        }
 
+        // if current player cannot make a move
+        if self.possible_moves(turn).count() > 0 {
+            return None;
+        }
         match white_score.cmp(&black_score) {
             Ordering::Greater => Some(Piece::White), // White win
             Ordering::Less => Some(Piece::Black),    // Black win
             Ordering::Equal => None,                 // Tie
         }
     }
-
-    pub fn game_over(&self) -> bool {
-        let (white_score, black_score) = self.get_score();
-        let max_score = BOARD_SIZE * BOARD_SIZE;
-        let combined_score = black_score + white_score;
-
-        max_score == combined_score
-    }
 }
 
 #[cfg(test)]