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Yup, that's good to point out. Zen mode helped me enormously when tackling puzzles, because just seeing how I had fared earlier was making me think about my performance instead of puzzles.

And later same thing on competitive games.

I play like 100 ELO better with Zen mode.

I think the effect is actually more that I make fewer careless errors playing worse players than that I am more intimidated by stronger players.

This is a good tip, I didn't know about that mode. Cheers.