Seemingly easy EV calculation I can't figure out

[Tackleberry]

After the explanation of a rounding error did not satisfy me I thought it over again. [img]/images/graemlins/smile.gif[/img]

The real problem is, that you counted 5*16 combos for the overcards. This is not correct, as there are only four (!) combos of ATs and KQs. So the correct amount of OC-combos is (3*16) + (1*4) + (1*4) = 56 (instead of 80).

In this case the distribution is 46.15% for OP and 53.85% for OC. When you take this figures, the EV comes out identical, no matter which way you take.