Difficult, but not impossible.  White to move and win.

wow, difficult, I felt hopless after Qd7

Good question!  I'll have to think about it a little bit but I'll see if I can find something that will make a good puzzle.

i have it! in the first try! amaizing

First! :P ...

No but seriously nice puzzle.  The whole concept ultimately boils down to time... black has no way to bring over any defensive troops in any effective manner!

Great puzzle gonnosuke, I should really stalk you more actively :P

very strong! big headache!

is there a clear win for white if black replies ...Bg7 after Rf3 ? after Rg3 Qd7 h3 Be7 Qxb6 white is better but with the opposite colored bishops I would still give black drawing chances

*Bg4 I meant

Yes, white still wins with reasonably accurate play despite the opposite color bishops.  After Rg3 Qd7 h3 Be7 Qxb6 Kh8 Rxg4 the h-file is still a concern for black and the endgame looks difficult if not impossible -- I don't see any clear way for him to hold without help from white.  That said, it may be black's best try under the circumstances.

I dont see a decisive win for white after 9...f5 in that line for example 10.exf5 Qxf5 11.Re1 Qf6 12.Qe3 Bd6 I think black can hold this with strong play

It's easy enough to find out -- give the position to two engines and let them slug it out.  They'll either run around in circles, confused by the opposite color bishops, or white will pound out a victory in clinical fashion.

you can't play 9...f5,  if 6...your bishop g4! is no more on the diagonal for your pawn to protect and chess!!

 very hard puzzle.

deep puzzle

i meant "check" not "chess" i must improve my english too...

Very instructive.  Nice puzzle.  white has to keep bearing in, bringing up the reserves.   Thanks for posting this one.

As I did this puzzle, the help button was the last thing keeping me sane.

 yes

this is a great puzzle by a great GM.  White either forces mate or forces opponent to resign. I like it, show them who is tough and who is the man!!!!!!!

i am very happy. i solved this, but at the last moment i repeated my moves twice.