On Thu, 10 Jul 2003 19:15:35 -0600, "Tom E."
wrote:

Has the same game ever been played twice? (unintentionally)
I'm not talking
about scholars mates here, but something like 20-30 moves
past a 10 move main line opening of the French or something.
Tom


Yes, for example see game 163 in "200 Modern Chess Brilliancies"
(Batsford 1981) where Stefanov-Andreyev 1975 got replayed as
Jansen-Vangelov 1978.

I suppose one could do a duplicates search (ignoring names and years)
in CB/CA on one of the mega-databases to find more.