Professional games with highest number of identical opening moves?

[GreenAsJade]

After how many moves does a game become unique (statistically)?

Maybe you’re thinking of this:

Extended quotation

argybarg: I found myself wondering today: What is the greatest number of moves into a game that two different professional games have been identical? In other words, game A and game B unfolded identically until, say, move 8. If I had to guess, I would say it would have to be 12, but perhaps someone with a very sophisticated pattern search could find out. A similar question: What is the farthest into the game that two professional games have re…