Would some of you old guys with better math backgrounds than myself check my math on this one... I have a store nearby that offers a bonus square that pays 5:1 if the first two cards total 20 (actually its a variety of payouts, but I'm using 5:1 as an average). There are 169 ways to get two cards and 18 ways to total 20. That gives me an initial 9.4:1 to earn 5:1, a bad bet even to a ploppy. but I estimate that if I can get the deck rich enough so there are only 9.5 suits I would have the advantage. For that to happen I figure the count would need to be +3.5. Am I correct? Please show me the errors of my ways.