Never seen a M100 notation before. Didn't even consider that this position could be winning for black. On the one hand I'm intrigued to learn to mate with 2N va. K+P, on the other hand it seems pretty useless...
There's a Karjakin game in which he manages to win with 2NvK+P
It left a deep impression on me and I take any opportunity to mention it, even if I'll probably never encounter a similar situation let alone convert the position lmao