How well do you know classics?
In both positions is White to move.
What to play?
Here are the links of the games (for PRO Members), but please, first think about the positions and then watch the games.
I'm not a pro member (yet) and therefore have no access to the given links - but I remember the game in the first position, W played the somewhat surprising retreat Nb1, as Nc3 was totally out of the game and had no moves forward. After Rxd2 W would have brought his N back into the game with Nxd2 and otherwise, W could get his N back into the game later after removing Rd2 with e.g. Nd2/Nb3.
I don't know the 2nd game, but the situation looks similar - W probably played again Nb1, as Nc3 was totally out of the game and had no moves forward and W could later bring his N back into the game via Nd2 and later maybe to f3.