Here is a `logic' puzzle which I have not seen appear before, and is not in the archive.
A tournament is to be held between two teams. The first team to win four games wins the tournament. There are no drawn games. There will thus be a minimum of four, and a maximum of seven games.
You support one of the teams, and want to end up having won $1000 if your team wins the tournament, and having lost $1000 if your team loses. You may bet an amount on each game, and you win that amount of money if the team you bet on wins, and lose it if the team loses.
How much money should you wager on the first game?
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