Conclusion: Even a player with a sky high IQ needs to concentrate.
Sensitivity of game review to blunders
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I think I am pretty smart guy, but many times I just lack the ability to concentrate or – equally important – to stay calm and just play the game.
I was interested to see how much a single move could affect the overall assessment of game review. So I tested it with a game where the last move blundered mate in 1 in a position where the evaluation was 1.34 for the side that mated before the blunder.
The result: the blunder reduced the accuracy from 80.0 to 71.9 and the estimated rating from 1900 to 1400. So big differences for a big blunder!
By comparison, for playing the mate the winner was upgraded from accuracy 82.9 to 83.7 and the estimated rating went up from 2000 to 2050.