The following move is considered dubvious in lichess.org opennings explorer because of the sacrifice in f7:
[FEN "r1bqkb1r/ppp2ppp/2n2n2/3Pp1N1/2B5/8/PPPP1PPP/RNBQK2R b KQkq - 0 5"]
1... Nxd5 2. Nxf7 Kxf7 3. Qf3+ Ke6 4. Nc3 Ncb4
The following explanation is given:
5 ... Nxd5?!
Immediate recapture of the pawn sometimes thought dubious, at other times theory considers it quite playable. From a positional point of view it's not considered a good move due to the creation of open lines that White can now use to aggressively attack, and for this reason it's rarely played at master level. While modern computer analysis suggests that it may be theoretically playable, few doubt that 5...Na5 is a more practical choice in an over the board game.
While I use to refuse sac lines because I am a poor player, I feel confortable with white in this line. However lichess says it is playable.
How much playable it is? Can black preserve material not being checkmated with his king on the center and the open white position?