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I tried using a formation of 7 Pegasus units, thinking that a concentrated formation would save some of them, but they ended up behaving the same as in a regular formation. So, I don't really understand how it works.
I'm withdrawing from the tournament.
If you have 7 stacks, it won't work. It works if you have a small number of stacks – then they will stand close together. Do a few experiments with different numbers of stacks, and you'll quickly understand the principle.