@dernman: Lol, I wasn't accusing you, you obviously changed your wording to be more clear.
Yes it is possible.
-White moves their knight out.
-Black moves their pawn out one square.
-White moves their knight back to its starting poistion.
-Black moves its pawn another square forwards.
completely missed that rofl, was only thinking of black pawn moving up 2 squares from the start.
for that position to be possible, Nb6 would have to be the last move made. It's not possible for black king to move, because of king on a-file and knight on d-file. I imagine it's possible for Black to have something like a bishop to move to b6 and white knight takes it, checkmating the king.
It's possible, but the player with the black pieces did a terrible blunder, but it depends as well on the previous positionings, how the black king could have ended in a8.
For obvious reasons the knight on b6 delivered the checkmate, which means that the black king was on b8 where the knight on d7 delivered the previous check, even though he could have moved his king on c7 or even c8.
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