This exchange sacrifice completely changes the logic of the position. Now the threat is 2 Bf4.

This lets the white knight occupy the newly created post on e5.

2...Nd7 3.Bxh6 Re8 was preferable, when 4.Bd3 Nb6 5.Ne5 Nxd5 6.Be4 keeps a clear initiative.

Now d5-d6 is inevitable.

Black resigned.

Restricting the knight on h6.

1.e6? Nf5! 2.Qc2 g6 with counterplay for Black, whose knight has an excellent destiny on d4.

Preparing ...Rd4.

In view of Black's plan, White improves his queen.

4...fxe6 5.Qc3+ , preparing Rxe6 with a strong initiative.

Intending a4-a5 with a second front. White is clearly better.