9. ... f5 in the old/modern CK ain’t stupid

Schandorff analyses h5! in great depth, mentioning the interesting f5!? as a superprise weapon, especially for rapid/Blitz.

I noticed that many people cannot handle those unvonventional approaches. For example, some don't eat pawnie.

When you are looking at your engines keep this in mind, please: „The highest art of the chess player lies in not allowing your opponent to show you what he can do.“ Garry Kasparov.

Two knights variation is good