Gilchrist is a legend wrote on 05/17/12 at 01:35:27:
So the queen sacrifice line in the Pirc with the perpetual check is allowed?
Must be, and it would be my guess that this rule is very likely to encourage peaceably-minded players to discuss which forced repetition to play before their game.
I've heard lots of horror stories from the French junior championships, here are a few:
One player reached a simple theoretically drawn position of bishop v rook, headed his king for the correct corner and so the players decided to agree a draw, and called over the arbiter ... who said that they weren't being "sufficiently combative" and forced them to play on! The same thing happened in the very next round to the very same player who was forced to play nearly a hundred unnecessary moves!
There was a case in one of the lower (junior) sections where one player needed to make a draw to win the tournament and managed to force a perpetual check, so they called over the arbiter who said "why did you repeat, you can play Qd6 instead?" to which the player had to explain that Qd6 lost a piece!
The mind boggles! What if the arbiter had noticed that one of the players had a forced mate, should he then force them to play something else? Surely a third person shouldn't have any bearing on a game's outcome whatsoever?