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Method For Boosters:
1) In Warmup - Disconnect, Change Name, Reconnect.
2) During The Game After Warmup - Disconnect, Restart CSGO and then Reconnect.
3) Last Round Of The Game (15th) - Disconnect, Abandon The Game (Make sure you do it before the match actually is over, don't die before abandoning).
Booster's can play as many games as they want dependent on how many accounts they have due to the matchmaking cooldown.
Method For Peronsal Use:
1) In Warmup- Disconnect, Change Name, Reconnect.
2) During The Game After Warmup - Disconnect, Restart CSGO and then Reconnect.
3) Last Round Of The Game (15th) - Disconnect (Make sure you do this before the match has actually finished, you cannot die before leaving), and then wait for the game to finish.
For personal use I recommend playing 2 games, then waiting a few hours, then playing a 3rd.
I would advise you not to play more than 3 games every 24 hours.