End game puzzle







Nice, elegant puzzle. I didn't give myself the 15 minute test. I only had 5 minutes to look at it, and then I toggled through the solution. (Art appreciation: sometimes I find it satisfying just to understand something when I see it, and I have less of a need to prove something to myself.) Really nice!
There are two parts to this puzzle; one much harder than the other, but they sort of lead on to one another so "bare with me". This is the first one. I will post the harder one in a minute.
This is the first time we've been publicly asked on a chess website to disrobe. What next!?