For 5-Card Draw I used Excel's combin(n,m) function, and constructed a table of every possible 5-Card Draw hand, and how many combinations of each there could be.

So for any given hand, I can tell you how many hands beat it, and what hand is halfway to the top.

2-7 TD is the same table, only upside down.

If you have Excel, I can tell you how to construct it, and give your some references for how to calculate the combos

in your 2,3,4,7 example, I would freeze w/ any 5,6 or 9 and take my chances

Dealt pat 7s, 8s and 9s are easy. Do you break Ts? Js?

I have only played 2-7 SD myself, and I don't know how much crosses over between the two games.

Cheers,

--VS