After a game, particularly one with a time scramble, you may find yourself too awash in chemicals to sleep (caffeine, dopamine, adrenaline, serotonin – I don’t know whatall, and probably different depending on whether you won or lost), lying in bed with a position or series of positions stuck in your mind.
Like this one. You’d think with the center pawns this would be easy, but White’s 41.f5 was clever and there are some tender spots on the dark diagonal. I spent many hazy minutes during the game trying to puzzle out a clean way to proceed without dropping d4 or d5 or c7 or giving up some ugly check on e5 or f8. And at home afterwards I kept grinding away at the position in my head.
The game ended 41…Be4+ 42.Ka1 Qe7 43.Rg1 Qc5 44.Qe1 and now 44…d3?? allows the messy 45.Ng6+!! but 44…Qc1+ 0-1 as the rook can’t stop the pawns (unless Black falls for the cheapo 45.Qxc1 Rxc1+ 46.Rxc1 d3 47.f6 d2?? 48.Rc8++).