There are two knights, on the squares g1 and e1, and one of them moves to the square f3: either Ngf3 or Nef3, as the case may be.
Kukhona ama-knights amabili, endlini h2 no-d4, kanti enye yazo iya endlini f3: Nf3 noma Ndf3, njengoba kungaba njalo.