private Color horizontalWinner() {
        for (int i = 0; i < board[0].length; i++) {
            Color current = Color.NONE;
            int length = 0;
            for (int j = 0; j < board.length; j++) {
                if (current == board[j][i]) {
                    length += 1;
                } else {
                    current = board[j][i];
                    length = 1;
                }
                if (length >= 4 && current != Color.NONE) {
                    return current;
                }
            }
        }
        return Color.NONE;
    }