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.