[PLOlover]

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I'm not saying that he cheats, but if he did, this is the only logical explanation I can muster.

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Well, by simple collusion he could determine, in the split Nines example, that the low hand could not have a straight, so he calls down for a virtual lock on the high.

To do this he would only have to collude with some regulars or hack/trojan their systems. I think this is very possible but not very probable. But if it can be confirmed he has won an incredible amount then I think this is how.