I think this happens to many of us, (making moves too quickly, before studying the board) at various stages of the game. You just have to slow down before every move, and pratice your S.W.C.C.T
S. Stop and slowdown, and look at the board, take in what has just happened.
W= Why did your opponant make that move?
C= Checks are there any threats of checks in the next few move.
C= Capture, can U be caputured by any piece on the board, can I capture any piece from my opponant.
T= Threats are there any?
Practice these things and you will stop losing piece's by your own silly moves. I'm not saying you will always win, you just have to look at my record to shown this is not the case, but you will definately win more. Plus you will know you lost because your opponant was more skilled than you, much more satisfing than losing the game by your own errors. Good luck.
I've noticed an ugly trend in my playing and I'm looking for general advice as to what to do about it. IT's not a tactical problem, it's a mental issue.
When I get into a winning position, I develop tunnel vision and commit heinous blunders. I've just thrown away two games - one where I was a rook up and one where I was a queen (!) up.
It's not a tactical problem as such - obviously I'm sound enough (for my skill level) to get to that position in the first place. But once I taste victory, I suddenly start to miss obvious things and am repeatedly blundering.
I don't know if anyone has anything to offer me in terms of advice, but I thought I'd throw it out there.