Join Date: Jul 2007
Posts: 148
It depends on a lot of different things. Quads over quads is far more likely to happen at a 9 man table than in a heads up game, since so many more starting hands are being dealt. It also depends on whether people play their small pocket pairs or fold them to raises, etc.
If you are heads up against someone, the flop has been dealt, and you both have a set... in this situation the odds are 2/45 * 1/44 = 1 in 990.
