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For some reason, the fastest mate my computer can find is in 12 with 1. Be6+, even after a depth of 26 (which should be more than enough to find a mate in 11, shouldn't it?).
One line (there are several equivalent mates, at least after 7. Qb7):
1. Be6+ Rxe6 2. Rxe6 Qa1 3. Qb3 Kh7 4. Qxd3+ Kg8 5. Ra6 Qxa6 6. Qxa6 Re8 7. Qb7 Kh7 8. a8(=Q) Rxa8 9. Qxa8 g5 10. Qb7+ Kg8 11. Nf5 Kf8 12. Qg7+ Ke8 13. Qe7#
It obviously still works, but I'm not sure why it can't find the faster one. Maybe the puzzle is leaving out a longer line that could save black for a few moves?
okay no one cares
great puzzle though. this one's worth it.
It is not so hard.
Very hard, but very fun!!
gd dm wht a savage
Done ... just to track. 10 years catch up ... about 3600 puzzles to go
A bit of guesswork for this one