redeiperdenti: 1. Rxe1 Rc2 2. Qd4 d6 3. Be4 Qh8 4. Bxc2 Rxe8 5. Nxe8 Qxd4
hard mate in 10
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Thaddeus with alternative lines I mean other ways to mate in 10, not other winning lines... I guess there are many winning lines, but the aim of the puzzle is to deliver checkmate in 10.
P.S. I just realized that the position is not legally reachable, look at the pawn e6 :)
meanwhile I fail to do mate in 3
How about mate in 10822 😈
by redeiperdenti
Note that houdini on my PC needs 2 minutes to solve this!
I'm not 100% sure the solution is unique, please tell me if you find some alternative lines.