Reuben Fine's BCE covers this - the troitsky ending  - you have to know the end positions and the stalemate trap - but you have to practice ! best is - practice against a tablebase (gnuechess or  crafty, with the nalimov tabebase-pair knnkp and all the its tablebases will do [knnkq, knnk, knk,knkq should be enough but if you are a perfectionist or trying to compose for composing an underpromotion puzzle put in all the above with q replaced by r,n and b also]

btw if you try to practice defending with K+P again K+N+N with opp being program with this tablebase (and the sub-tablebases!) you'll see that it doesnt go Fine's way - in general it finds a shortcut.

In the old days when the no-nonsense Botvinnik was USSR  caption, one GM had the misfortune to meet the troitski ending (with P behind the troisky kine) twice in matches, and he didn't have a clue so he drew them both. Botvinnik suspended him from the team until he had mastered the troitsky ending!

 

I like the pair of Knight, and have some article in my blog.(Hussar articles) But can checkmate one Knight too. On the edge of chessboard. Your example is interesting.