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"best of 9" An online multiplayer deathmatch scenario. Made famous in command and conquer red alert 1. Prison rules setting. When 2 players are arguing over who is better and argument descends into tit for tat. A 3rd neutral player will tell them both to shut up and call a bo9. Once bo9 is called the time for talking is over. Bo9 settles the argument. Bo9 will usually be played with rotating maps but sometimes it will be 1 exclusive map to determine who is the superior player on that map.
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