Uzytkownik "J.D. Walker" napisal w wiadomosci
...

1) There is a specific FIDE regulation about this. I think it's ill-
advised, but it's there. 2) Short complained to the arbiter (which is
why I'm not too sympathetic about his having to play the game on what
should have been a rest day). Presumably Kramnik and Topalov showed
better sense and did not. 3) You can certainly try this in a U.S.
tournament. I don't advise it. Most TDs will tell you to sit down and
play the game.

Mr. Hillery,

I apologize in advance, but I find these bizarre FIDE legalisms
fascinating. Hypothetical: what if Short complained to the arbiter about
Kramnik and Topalov not shaking... Could he have had them both forfeited
for being generally rude and poor sportsmen?

On another tack, what if one opponent bows while the other offers his
hand? Then they both complain...

Shaking hands is a, quite old, chess tradition. Of course, I can imagine
that chessplayers from other cultures prefer not to greet each other before
the game but the fair play requires real sportmanship and greeting before
the game. I cannot see such sportmanship between Kramnik and Topalov.

And shaking hands, AFAIK, is not a FIDE rule only a recommendation.
Chessplayers can greet each other in other ways to show that wthey will
compete honestly.