Implicit Collusion
In a tournament where, for example, only the top 5 players are paid and there are 6 remaining (the last of whom is terribly short-stacked), implicit collusion involves all players at the table flat-calling through the river for the maximum likelihood that the short stack be busted by having all hands see the finish. This strategy is never mentionned at the table, merely assumed.
See also: bubble.
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