Originally posted by robbie carrobiePerhaps
[b][hidden]looks like Rc6 wins , king has two squares, d7 then Rd6 wins the bishop, or Kf7 which leads to Bg6 and mate (did in my head, probably wrong but its good exercise[/hidden]
oops just saw the bishop is attacked on b4, oh well, im bust as well[/b]
The king must move and (I think) can be chased into mate or a Queen fork.
It is indeed 1.Bh7! not only with the skewer threat but the opening of the e-file, which results in mate if black tries to save the Q.
Or, if black takes the N on move 4:
Of course, black can give up the Q to avoid mate in some of the lines below. But, assuming he doesn't:
Ok, blah blah blah, all those variations. The bottom line is black's K is much more danger than is first apparent. The opening of the e-file is that little extra something that pushes things over the tipping point.
In the game, Spassky managed to beat Geller with 1.Rc6+ but it obviously took longer.