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Alas, too easy. I’ll try for a harder puzzle next time! Thanks for playing!

I like the idea of puzzles where you have to determine whether a position is impossible or not, but this is the easiest possible implementation of that and I doubt it'll fool anyone.

@ShadowyZephyr Fair enough. My last one was a probability one that was also pretty basic but it played out well. I’m stronger at probability than chess though, so my ease-meter could be off. I think an important difference is that once someone posted the answer for this one it was obvious where as the probability problem left people still wondering if they had missed something. I don’t want to go as complicated as the snake eyes one that playing out now and seems to just be generating confusion about definitions.

If black to move:

1. Nf3, d5

2. Ng1, ...

If white to move:

1. Nf3, d6

2. Ng1, d5

3. ...

Note that white goes first in chess.

@VickiWilliams does the provided answer suffice?