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Bluefin: That would take out some of the fun if you take away the person who bid 0 and the next lowest.
Take for example, 3 players left - 1 player with 0, 1 player with 1,000, and the last player with 1,200.
How it is now, the players with 1,000 can either bid low to keep a lot of points, or bid high and try to get the 500 point bonus - and depending on what the person with 1,100 points does - it will be a good game for these 2 players. With your rules, the game would be over - player with 1,100 just has to bid 1,001 and win the game.
And idea if say more then 30 players are left, take out 2 lowest. 50 players, take out 3 lowest, etc... is an interesting idea - but most of the ponds now have around 20-30 players total, so probable not worth adding a rule like that for the few games which are going to have that many players.