Oh wait. I'm doing it in 8. Let's see if i can find 7...
Nope, fastest is 8 for me.
Wow, that is a very hard puzzle. Congrats tonight only.
I think that puzzles which allowed castling in any position other than what could occur in an actual game are stupid and I am glad that they finally made them officially illegal. A sensible player would never castling on the opponents side of the board anyway.
Well, the new rule fixed it. This puzzle was probably created before the new rule.
Fastest in 7? That obviously doesn't include black blunders.
Fastest with black playing its best is 7.