https://www.youtube.com/user/Chessexplained/videos

International Master commenting his live games. Whenever he feels he have fuk'd up, he will let you know why and how.

Cool but I'm only strictly using chess.com to learn since I actually paid. 

when my opponent messages "gg" after I've made a move.

I didn't link it as a learning tool.

Didn't you want to know what is going trou the mind of a strong player when realizing they made a mistakes and why they consider a move 'bad' in the first place?

"how? what kind of a mistake? how are your mistake different than mine?"

I'm not gonna go through a thousand video of some random guy's youtube to find an answer. 

          You know you've made a mistake when your lawyer tells you your 3rd wife is entitled to MORE alimony than your 1st wife

is that how you feel right now?

The laughter?

One of the ways to know I've made a mistake is to see a move I could have made that was better than the one I did make.  

Unintentionally losing a piece that could have been protected is a tip-off that I made another mistake.

              Sorry Riv4L,  I didn't know you were the OP, and by the look of your avatar, I'm pretty sure you can kick my ass  so I'm gonna exit stage left because I'm pretty sure I just made a mistake

I have noticed a few things that may help you become more aware, when it is questionable. First of all, if you can't figure out what to do next, as if you are in a net and you feel a sense of impending doom, it is likely that you have made at least one mistake and likely 2-3.

Something that helped me to trust my instincts more was that I started looking at the evaluations of the openings I played with an engine. I wanted to see if there was a rhyme or reason from a mathematical perspective, for why I chose the moves I did. I thought maybe I was running from a fight in an even position, or if I had a small advantage. I wanted to make sure that I wasn't being too passive.

To my amazement, my instincts could help me to tell the difference between .001 of a pawn at times, when looking at two moves and thinking the worse one, had some issues, if I wanted to play it. Sometimes the smallest advantage isn't missed. Sometimes it is. Learning when you can recognize and when you can't, is helpful.  

If you study what makes finding the best more difficult in one position, more so than another, it may help you to see what limits your opponent's options and what increases your's more easily. This by default could help you to not only see mistakes before you make them but, also to help you realize when you've made one.

Another way I can often tell is when I am trying to put together a plan and I always seem to be one step behind my opponent. If they can see what would work for you, it is likely because you have made a mistake or three.

How do you know when you've made a mistake?

When you want to facepalm yourself

Bye-bye, my Queen.

High-rated mistake.

Thought provoking post but why would it be a mistake if they know what works for me though?

It isn't necessarily but, if you are in a position where they see your only recourse and keep beating you to the punch with either the initiative or with threats that keep robbing you of the chance to equalize, it is likely because, you made a mistake and forfeited the chance to do so.

The main exception I can think of is when you are in a dead drawn position, especially one that is simplified. It will tend to feel like you can't wrestle the advantage away, but, you will feel a sense of saftey.

Chances are if you are in a drawn position, early in the opening, you may not be able to tell if you are equal, slightly better, or slightly worse. Your opponent might see what your ideal plan is at that point but, chances are you'll have alternatives, so this scenario won't feel so much like you've made a mistake.

If you are doubting the validity of my claims, simply make a note in your games, when you feel like you are even, ahead, worse, etc, with each move you make. After the game, check the evaluation scores and see how good your internal compass is. That should help you to trust yourself more and this will help you by feel, to not make bad moves.

A tip I once heard for finding mistakes when you're analyzing your game:

Every five moves, evaluate the position (+/=, =, -/+, etc.)  If the evaluation changes, someone made a mistake within the last five moves.  

No, I'm not doubting the validity of your claim, in fact I am inclined to believe you since I want to trust my feelings when something doesn't feel right. That's why I used the touch-typing example to explain when something feels off, it usually is an indication something is wrong. I get this feeling too when I play. Maybe I should just take time off for several months and focus on understanding these feelings more and how to overcome them. 

I'll elaborate a little more on touch-typing though, before I learned to touch-type correctly, I would always get this bad feeling that something is wrong, like my fingers just did not cordinate well with the keyboard. So I begun practicing on keybr.com to work on eliminating this "bad feeling" that I kept getting when I typed, now it feels more natural and this feeling no longer bothers me. My goal in chess is to remove this feeling. 

Often times when I'm in a position, I feel it. I sense it, like something I did was wrong in the position and it's a feeling that tells me that I can't fix the position. 

I don't want to sound dictatorial in telling you not to sear your own consciousness, of your feelings. However, I think managing them is important. If they betray you, then it is paramount. It is obvious, you are convicted of the truth. If you completely numb yourself, you put an unnecessary burden on your mind to be aware of everything and solve every problem. Some answers are provided for us, through our intuition. Learn to utilize your feelings, to free up part of your mind. Some of the greatest genius known to chess has came via intuition. If you are having trouble correlating a concrete example, think of Mikhail Tal and realize he said, " There are two kinds of sacrifices, mine and those that are sound". Still he managed to win a WCC. His intuition served him well. You'll never be able to keep up with Houdini, so you might as well utilize something Houdini will never possess, no matter how good programmers get...

Mistakes cost material.  Some mistakes can be very subtle.  End of Story.

Save yourself thousands of keystrokes.  Study the royal game, instead.

If you make a mistake and your opponent doesn't capitalize, was it still a mistake?