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It frustrates me that the site does not give the strongest defense for black. The position is mate in 6, not 5:

1. N4 N5

2. Nx6+ K7

3. R4 N3+!

4. K2 N5

5. N8! Kx8

6. Rx5#

You give "3 ... N3" a !, when it is literally the only legal move the black has.

The site plays Kx6 instead. You're right though that I was generous with the exclams; all the moves are easy to find in reality.