Which sentence contains an essential adjective clause?

what confuses me is the difference between ultimate and indoor frisbee rules.
because of weather conditions, some countries only play indoor ultimate frisbee.
indoor ultimate frisbee is the only version that i enjoy playing.
indoor ultimate frisbee, which is a another version of the sport, requires fewer players.

The first two sentences don't even have an adjective clause, so you can rule them out.
When it comes to essential clauses, the easiest way to find them is because they don't have commas around them, whereas nonessential clauses are set off by commas, as is the case in the last sentence here - which is another version of the sport is a nonessential adjective clause.
This means that the sentence that has an essential adjective clause is the third one - Indoor Ultimate Frisbee is the only version that I enjoy playing.