[myownpetard]

That's surprising to me especially for rapid but you're better than me (2000 lichess). Under time pressure, if I have a passed a or h pawn and can simply trade down and promote I will opt to do that rather than try to calculate a deep mating combination.

> other than in end-game

This is frequently where such scenarios occur. Many end games are difficult for humans to play with absolute precision, even seemingly simple ones like knight and bishop vs. king. But when there are fewer pieces on the board is exactly when computers are able to perform incredibly deep calculations.

A good example is the notorious 30 move forced mate that Caruana "missed" in game 6 of his world championship match with Magnus, which occurred with only 3 pieces and 3 pawns left on the board.

[Andrew_nenakhov]

To be honest, I'm lazy and rarely calculate more than a couple of turns: I just have a mental picture of what I want to achieve and seek ways to get there.

However, I do look up a post-game analysis, and if there are some mid-game deep checkmates, they show up in it, and it is extremely rare. The example you cite about Caruana/Carlsen game actually quite falls into the category of what I referred to as 'endgame mates' - and looking at it with a potentially cheating player in mind, such cases are rather irrelevant: a cheater will win a game or arrive to an overwhelmingly better position in the endgame so such extreme measures with 30+ precise move checkmates will not be necessary.