PBW RACE TO SEV TOURNAMENT OF CHAMPIONS

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Alneyan is right. Researching mines is still very cheap with high tech cost. Sweepers however, become very expensive in such a game as both high level sweeping and large shipsizes won�t be able until much later in the game. The 15 destroyers with level one sweepers needed to sweep 100 mines will be a serious strain on the small economies and make offensive actions virtually impossible for a while.