White to play & win (Amazing one)

While looking at my old stuff, found this one, which still amazes me. I saw it few years ago in a local chess club, the guy who offered it, said it was in an OTB game of Fischer. I'm not sure though, please correct me if anyone knows the source already:

 And if black deviates at moves 5:

Supeer!!!

Thanx, so anyone knows the source?

An amazing display. Thanks :)

A Google of "b6 d5+" and "Fischer" found five games, none of which have this line.

very nice position

Thank you all, but David, not all the websites with chess databases have included the moves of every game in html. that's why you may never see this game as a result of your search, you know what I mean...

Cool.

Great puzzle. Cannot help with source.

I also believe this is a fischer...remember seeing it.

you would never believe it from looking at the position... but its not overtly impossible to imagine a master precisely calculating all the possiblities.  Amazing though...

My database includes 7,139 of Fischer's games and it neither includes these positions nor any Fischer Bs of Opps ending with 5 or less pawns and king on h1 and h4.

cool...truly amazing..