Here is the Rob Singer challenge:
https://vegascasinotalk.com/forum/sh...-25k-challenge
It's a trick where Rob wants you to bet against him having "winning sessions", where the catch is that he can keep doing a Martingale betting progression to where there is a high chance he will come out a small amount ahead (and a small chance he will come out way behind).
By getting people to bet against him being able to "come out ahead", and the bet being as large as $25k, that makes the normally -EV Martingale strategy into something +EV (due to the $25k boost for successfully Martingale-ing).
When people refuse this trick bet, Rob insists it's because they're scared of betting against his winning strategy.
I offered instead to cross-book a video poker session of his, where I win or lose what he casino wins or loses, and he refused. That would be the fair way to do it, but he won't because he knows that wouldn't give him an edge.