Intuitively, we know this, the only probabilities that matter are the relative chances of A and B of winning,

I went on to define craps:

The game is played with 2 dice, a first throw
can finish in either a loss
(if I throw 12,3 or 2), a win (if I throw 7 or 11) or a draw-replay,
(if I throw 4, 5, 6, 8, 9, or 10, from hereon I have to remember what I threw in this case,
it
will be called
my ``point''),
if I have a replay number, I have to go on
throwing the two dice, until either
I get the same number I had at first, then I win,
or I get a 7, (I lose).

Here are two craps websites, I found useful:

http://www.charm.net/~shack/game/begcraps.html

http://www.cris.com/~Atiara/DiceOdds.html