BO3 with veto!
The relegations will be played in a bo3 mode with a veto system. The team, which comes as second from his group stage will remove first one map - in your case it`s neXtPlease. Then TeG removes one map. In the same order, you can choose from the 3 maps left. neXtPlease will choose the first map to be played. TeG will choose the second map. The last map left in the map pool will be the decider if the result is 1:1.

HLTV: HLTV.org Top match

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map pool: de_dust2, de_inferno, de_nuke, de_train, de_tuscan

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First map - de_train
Second map - de_nuke
Decider map - de_inferno