Ouch. I twice missed mates in one against 2300+ players – but fortunately one of those had sufficient time pressure that it was almost justified. The worst part is I scored .5 out of those two games.
White King was on g1. Black’s last move was RxN on f7 defending smothered mate) I saw Qe8+ followed by Qxf8#. I presume everyone sees white’s mate in 3 in the shown position. Correct?
Pretty typical “sight” mistake that can happen when one is in time pressure or not. Get over it and move on. Don’t beat yourself up over trivial stuff. A good chess memory allows you to laugh and forget silly mistakes.
LOL I have been doing Tactics Burn-in yet again in my life, this time after being away from chess for over a quarter of a century, but this time I am doing it very thoroughly as I have the time. After doing a lot of it with a1 in the lower left no matter which side was to move, I have been looking at Tactics Times positions for a bit. That book set gives you the over the board view, which took some getting used to. When I saw this position, I went into brain freeze, knowing something needed clarification. Then I finally realized, we were not told where a1 was. So the brain freeze was a reasonable reaction for a change.