Instant win:
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While playing a 5 Card Draw unlimited tournament, take everyone's
money before the round finishes during the first two rounds. When
you finish the second round (when no one else has money remaining),
exit to the main menu then re-enter the tournament. It will start
in the third round, but you will instantly win the tournament.

Keep your winnings:
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If you lose a large amount of money, press [Ctrl] + [Alt] + [Delete]
and close the game. It will not save and when you return to the
tournament it will resume from the last game you saved. If you win
a lot of money, it is a good idea to exit to the main menu.
The game will be saved there.