It's very frustrating to lose a game that required no losing. But it's good to savor the feeling of disappointment, because in another game, on another day, I will again be faced with the task of ensuring I was not making an error, and I will remember, with a tangy sweetness, the palpable frustration of having dropped this pawn in this way.
Lately I seem to be accumulating more than my share of credit hours at the chess University of Experience. Let's hope her lessons are as useful as they are hard.
I like that about chess. You see your mistakes come back to haunt you directly, in ways from which you can learn (and yet, often, sadly, make once more another time).