You can achieve 100% engine correlation pretty easily. It just requires an unworthy opponent and we're talking very weak. Which engine is evaluating even matters, stockfish might say 100% but leela might say 95% because it saw some odd deep computer line you didn't play.
For a super gm to achieve 100% engine against another supergm? That's really telling there was an engine involved, in fact the same engine.
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[ 0.14 ms ] story [ 27.2 ms ] threadFor a super gm to achieve 100% engine against another supergm? That's really telling there was an engine involved, in fact the same engine.
According to the tweet in the answer [1] Carlsen had 2 100% games from ~100 games.
[1] https://twitter.com/ty_johannes/status/1574780445744668673
From 2021, Tata Steel Round 12, 30.01.2021 Magnus (2862) played Radosław Wojtaszek (Poland) rated 2705 at the time