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this territory is moderated
I'm excited to see the solution. I have no clue myself!
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c7, Rd6+, Kb5, Rd5+, Kb4, Rd4+, Kb3, Rd3+, Kc2, Rd4, c8=Rc8, Ra4, Kb3, Rg4, Rc1#
Gotta promote to rook in order to prevent stalemate with Rc4+
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