I often just lob my knights around the place, really confuses the opponent :)
How to destroy strong fortress of your opponent?
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You pretty much need the shark-phaser expansion pack for this. Of course, the phaser beams won't work on Mongolian territory, so if your opponent has managed to construct a fortress there, it's very difficult to proceed without delicate movement of your sharks.
what a strategical mind of you, theoreticalboy.
I may learn from you, pellik
Sacrifice? or finding the weak square? may be just wait for weak moves from your opponent? It depend on you to decide surely... Good luck chess lovers.