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Perfect game! Too bad it was my opponent who played perfect...

Van Kampen gives 21. ... g4! 22. Nf6 Bf6 23. fg4 Rg7! 24.h3 h5 with a good game in his 7h KID videos. Or 22.Rfb1 g3!.
This is a very suspicious game. Your opponent has played some perfect games but his rating doesn't correspond to the level of play.
@todo_pro: think you are correct. While lower rated players can also play a perfect game once in a while, in my opponents recent games it suddenly happens many times. So either he must have studied recently a most excellent chess book or...

However everybody is innocent until proven guilty, so lets wait & see if he is going to be flagged or not.
The only "inacc." made by white(13.a4) is common theory. Just wait till the fingerprint is finished.
his lasts games have very low centipawn loss but the moving time look very human so he might not be cheating
The first 21 moves are known opening theory, so the game counts only 12 real moves. If this player is strong in opening theory, then he might have worked out some more moves beforehand with or without engine. Even Kasparov abandoned the King's Indian Defence as he lacked time to keep up with the theoretical knowledge.
To avoid misunderstanding, when I created this topic I had no indication of foul play, as mentioned above, this game can be played by lower rated players if they have memorized the opening line and the final combination is also not that hard to find. Also previous games seem to be legit so I decided to give my opponent credit for playing a perfect game.

However, as todo_pro mentioned, after this game this player kept playing an unusual high # of perfect games, even when opening 1...h6 and 2...a6 as black.

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