This is just a short post to remind people about how the best of 5 map system works.
First of all, you must play all 3 maps (DM2, DM3, E1M2). You can do this in any order.
If it is 3-0 after 3 maps, then obviously the game is over.
If it is 2-1 after 3 maps, then you should follow this example:
Clan A vs Clan B. Clan A is winning 2-1 after 3 maps.
Clan B therefore chooses the 4th map. If Clan A wins, it's 3-1 and the game is over. If Clan B wins, it's 2-2, and Clan A should choose the decider map.
Therefore, if all 5 rounds are used, 2 maps will be played twice, and one map will be played once.