when making moves particularly in the mid stages of games always be aware of opponent peices sitting on the "sidelines" these can often cause problems and cause you to loose your confidence.Look before you submit your move.
silly mistakes

yup, waaaay too often have I pressed submit, then seen my blunder as it faded offscreen....
But, then, I do that OTB too...so maybe I'm just not very good

In your 'avatar' - picture, seems you've learned your lesson and are now studying the sidelines...congratulations
when making moves particularly in the mid stages of games always be aware of opponent peices sitting on the "sidelines" these can often cause problems and cause you to loose your confidence.Look before you submit your move.