so lets say 20 players - 19 rounds. You want to keep at least 500 for round 19 to hopefully be enough to get bonus (19,500) - round 18 with 3 players left - safe to say someone will be below 1,000 left so a bet of 1,000 should be safe (down to 18,500)

etc... etc... Still a lot of guessing which will work for about 1/2 the game, but with so many players making unpredictable bets - it will be hard for a system to work.... in my opinion. (I would love to see the math though - would be interesting)