Yesterday in two consecutive games against a 2200, I played pieces to squares that were covered by a knight, without noticing the knight. I blamed my glasses, which were too magnifying, giving me tunnel vision. At least, I couldn't think of any other reason. A couple of weeks ago I'd won one and drawn one against him. They were 20 minute games and yesterday's were 10 minute games. The remedy seems clear.
Original advice for taking blunders out of your game
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yes, sit or stand further from the board and see all pieces.
Feb 11, 2017
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#4
One serious piece of recommendation - if you're thinking hard on a position, rotate the board or stand behind your opponent and see the board from his/her perspective. It may let you see certain things that you haven't seen from your side.
Play chess in all sorts of different circumstances.
Play chess on real sets and online 2D. Play chess on huge sets and tiny sets. Play chess in the pool. Play for hours to the point of exhaustion and then play some more. Play chess angry. Play chess drunk. Play chess standing up. Play standing on your head even.
Seeing the game in so many different ways will help greatly with the elimination of blunders.