Request for Input: Endgame Calculation with 10-15 Minutes on Clock

Hi everyone,

I hope you are doing well. Thanks for taking the time to read this post.

I am reaching out to the chess.com community out of curiosity about methods of endgame calculation in limited time. By limited time, I don't mean heavy time pressure, but rather, suppose both sides have 10-15 minutes left on the clock, with or without increment/delay.

Any input?

To give you some context:

I have not developed an ability to visualize/calculate mentally without looking at the board (I tried in the past and gave up). I am only able to calculate and visualize while looking at the current board/position, and after I reach a certain limited depth, I lose confidence about my memory of where the pieces are, so I go back to the current position and start with the line again, and after a few iterations, I form an impression of which way things might be headed and am usually aware that I might be wrong but am sometimes overconfident.

In longer games, I have a chance for more attempts at calculating a particular move / line (sometimes limited by impatience, restlessness, lack of energy, overconfidence, attitude, or even boredom), but even moderately shorter time controls are a different story.

Consider the position after white's 27th move in my recent 15 | 10 game: https://www.chess.com/live/game/2423475012. I had 14 minutes. I was trying to calculate 27... a5 28. Ka4 Bxc4.

After two or three attempts at deep visualization of 29. Bxc4, I formed an impression that black would probably get a queen first (but couldn't confirm this because I was particularly conscious of the clock because I was playing with the underwhelming touchpad on my Lenovo laptop).

I then saw the possibility of 29. Be3 (and 29. Bd1 also for that matter, although that looked too risky for white with the kingside situation), and sometimes in such situations, I also try to carefully consider moves like Be3, but as fate had it, in this game, I had not even started analyzing it, and after fiddling around with the bishop for a few moves and repeating the position (and getting some repeated draw offers from the opponent), I decided to take a gamble with 31... a5.

In hindsight, this might have not been a good idea because after Be3, black might be a bit prone to some sort of zugzwang later on, but who knows...

Any feedback/input/tips? Please comment. (And please don't worry about being nice... feel free to say it as it is )