Hrewsahgs: + K19D17M16L15N17N18O18N16N19O17M19M15P18 I wonder if this would be an acceptable replacement to the main solution? The attacker can arguably do better than L15, but at least by that point it's whole-board related instead of purely local.
Miko_boc: I wonder what happens if p2 is answered with r1 instead of capture at p1?
posetcay: P2 is a really nice refutation, I can not find a way for white to live after that. That means the problem is unsolvable as it stands now, so I changed the problem a little to fix it as best as I can (added O18 and M16), but I am open to alternative suggestions.