It's too funny he negotiates a few modest blackjack rule changes that takes the house edge down to .28%. Then he negotiates a seemingly modest request, whenever his losses total $500,000 he gets a rebate of 20% of the losses. The casinos didn't really think about it but they were handing him a nice mathematical advantage. He doesn't count cards and they are very good at noticing people counting cards nowadays. Well he didn't need to. Whenever his losses totaled half a mil he would immediately stop and get his modest rebate. Unsurprisingly he was willing to keep playing for big time stakes for hours and hours.
http://www.pittsburghlive.com/x/pittsburghtrib/ae/gambling/s_742649.html
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