26 moves!
playstrategy.org/WoQrDwmq

33

Ok well, here's one in 13 moves

playstrategy.org/leZYMGFu

It was tough, lot of trial and error, to figure out how to get it to work :P Probably a good bit of luck too

313

And a slightly more optimized one of the same idea in 12 (23 ply) :)

playstrategy.org/tpKYmidfgiRO

233

That's a nice tactic - probably cant get much faster! :)

111

Entries for Weekly Challenge 9 has closed. Thanks to all users who participated.

The winner is @shinuito who managed a mate using the King Vision rule in an impressive 12 moves (23 ply) with the following entry: playstrategy.org/tpKYmidf

Users are still welcome to attempt this challenge and post answers here, but the winner has been fixed. The next challenge can be found here: playstrategy.org/forum/weekly-challenges/weekly-challenge-10-pass-panic