The above is chapter 5 in "Chess for Zebras". I am convinced that lack of concentration has a lot to do with why I lose games.
After a couple of mediocre performances, I had a chance to go 3-1 last night in the Waukesha Chess Club Championship. A win would have given me a nice rating gain. But I lost and it cost me over 30 rating points.
I am Black with the move, and was very happy with my position. I was sure that I could put pressure on the White pawn center, plus I had an overwhelming time advantage.
White's last move was Qg4. My first thought was to play Kh8 to side step any tactical ideas based on Bh6, but since I had ...Bf8, I decided not to take a time out for defence and played ...c5.
But ...c5 is a blunder here as after Bb5! Black must lose the exchange!