How to train against simple blunders?

Dear chess friends,

I have made a statistic over some hundred of my rated blitz and rapid games about the types of tactical blunders I do.
Turns out, the biggest single type of blunder I do is really simple stuff, like

• placing pieces so that my opponent just can capture them
• moving away a piece which is protecting another piece B, so that my opponent just can capture piece B.

Is there any way to train to avoid these blunders? I have not yet found anything.

(I have found ways to train the other way round: To capture hanging pieces of my opponent. That is something completely different and is not what I'm looking for.)

Go to your profile and switch on move confirmation.
Think about your move, play it, check it is no blunder, confirm.

Some other user posted this a while ago. You can train with the blunders from your own games.
https://tailuge.github.io/mistake-o-tron/index.html

@tpr: Thanks for the hint. I had heard about move confirmation. But it seemed always not to be the same as training against blunders. Or is it? Maybe I should give it a try. Maybe it has got a positive effect.

@trichter: Thanks for the hint. I have checked out tailuge's mistake-o-tron. It only finds mistakes I made with black when I set color to "any" and it doesn't find any mistakes I made when setting color to "white.

But aside of this bug, it shows me all of my blunders/mistakes, not only simple ones. E.g. there are Mate-in-4 mistakes
and even endgame errors which probably are blunders for a stockfish but there would be no chance that I would understand those. It seems, blunders here are only determined by severeness of mistake, not by complexity of problem.

I am looking for a way to train against simple blunders, not against mate-in-4-blunders - or even mate-in-2.

Blunders do not come from lack of training, but from lack of discipline. It is something you know and would notice if you pay attention. The blunder results from playing too fast or from playing carelessly or from deep reasoning about small positional details while blind for the obvious loss of a piece or checkmate.
So you cannot really train against these. It is a matter of discipline in thought. Move confirmation is a way of avoiding blunders. After thinking about your move you just check your intended move is no blunder.

Best advice I ever got on the subject is to develop a simple checklist you go through before committing to your move. First step is to look at each of your pieces and ask if any are unprotected or underprotected, meaning that your opponent has move firepower pointing at a square than you are prepared to defend. Go through every single of your pieces for each move. If you see a vulnerability, select candidates moves that prevent or minimize the vulnerability. Then do the same thing for your opponent's pieces. Are any of his pieces unprotected or underprotected. Select moves to exploit anything you find. Finally, check your checks. Can your opponent put you in check? Can you put him in check? I know that sounds like a long process, but force yourself to use that and you'll be surprised how quickly it becomes second nature. At the very least, it will slow you down long enough to not hang so many pieces.

@Alakaluf One of my students was having the problem you describe. She was playing too fast and not thinking in the way @tpr and @sbenson1974 describe. So I recommended several things. As tpr said, turn on move confirmation. Play at a much slower time control (she was playing at 5+0). Then she and I made a physical spreadsheet of things to consider on each move; topics down the rows, move number across the columns - what sbenson1974 is describing. She then is to check off each one on every move. Of course, some of the things to think about are not applicable in all positions.

Cons: It will be harder to get a game at longer time controls. It will seem tedious to be checking off these things each move.

These are analogous to training wheels on a bike; eventually you want to remove the training wheels.

It's weird because at your level (1950 rapid and 1800 blitz), it's quite unusual fro you to make this kind of mystakes.
What I recommend is: either do as @jomega said (which is the best way to be fair)
or take your time on EACH move.
If you were to go to a OTB tournament to see a IM/GM, you will be astonished of how much time they take on each move. For example, a GM could very well solve in 3s a apparently complicated position while he/she take about 30min a apparently simple postion.

#8 What do you think is going on in the apparently simple positions? room for planning? too much....? i have no idea, would be interesting, maybe to find such positions (too bad time spend per move is not PGN data, right?). Time is a fascination for me, i don't trust it. but still curious. know your enemy... right!?

What your essentially asking is if there is anyway to learn how to stop making bad moves. Here is my advice and I know everybody will think it is dumb.

Play some ultrabullet then analyze the games. Often in ultrabullet games the postion never ends up getting complicated it always stays simple. Look at what type of blunders do you make, are they pawn pushes, needless captures, or just hanging pieces. This will highlight the weaknesses in your intuition. Compare this to your slowplay and see if you make the same mistakes here as you do in long time controls and if you do then you've found the solution to your problem. Your intuition is bad play some fast chess games to improve it.

If not then ignore this idea as it won't help you stop your silly blunders.