Doyles Online Poker Room

There are only a handful of different heads up possibilities.

Pair over pair. (A-A vs. K-K)
2 unpaired, unsuited over cards (A-K off-suit vs. J-10 off-suit)
2 unpaired, suited over cards (A-K suited vs. J-10 off-suit)
1 over card and 1 under card to the opponents 2 cards (A-10 vs. K-Q)
Split over/under, over/under (A-J vs. K-10)
Over pair to 2 under unpaired (Q-Q vs. 10-9)
Under pair to 2 over unpaired (10-10 vs. A-K)
Pair to split over/under (Q-Q vs. A-J)

You get the idea. There are a limited number of combinations. Folks have already figured out the odds to all of these possibilities. Do a search and you can find the percents. OR, just use an on-line calculator to figure out each different situation. From there it shouldn’t be hard to memorize each outcome. (I listed most of the possibilities.)