>Chess, for instance, was one such source of truth. Played a couple long games against evenly matched opponent(rated and everything). Made a complete ass of mys

>Chess, for instance, was one such source of truth. Played a couple long games against evenly matched opponent(rated and everything). Made a complete ass of myself. Played easily 3-400 elo points below my usually level. And all the while thinking I was playing brilliantly and calculating deep lines, I was really just imagining lines that never worked. My working memory was terrible. Time management completely off. As a supplemental anecdote, I won my first chess tournament at Manhattan Chess club in the early 1990s while dosed on a significant amount of mushrooms. Certainly the perception of time is an issue and I'm certain the results would have been different if the game had been shorter (as most games are these days), but in a 120 + 60 it wasn't an issue.