This is Chess960 position #310, the prototype of the hanging-rook motive. After 1.c3 Black has only 1..Ng6 or 1..g6. The latter leaves the knight in the corner. A possible continuation: 2.d4 Bg7 3.e4 c5 4.Ng3 cxd4 5.cxd4 O-O 6.d5 and Black is cramped. It looks like only 1..Ng6 will lead to balanced positions, after some forced moves. After 2.h4 h5 3.d4 c6 4.Ng3 Black will want to break symmetry with 4..e5. After 5.Bg5 Be7 6.Bxe7 Nxe7 the initial problems are resolved.

After 6...Nxe7

This means that there is at least one Chess960 starting position that, with best play by White, forces Black tactically to make specific moves. So if you play the Fischer chess variant you need to know these positions.