If you have yet to try out Divekick, I heartily recommend you take a trip to Steam today and pick up a copy. Perhaps the simplest fighting game ever made, it's being sold in a one-day promotion for the delightfully low sum of $2.49.
Divekick really gets into your head. Will your opponent jump now? How about now? What if you jump now? So many difficult questions surrounding something as basic as one maneuver, this is as much a psychological game as one of timing and a fascinating look at the power of a singular move. You should go check it out, but hurry. The sale is only good for today.