Avoiding blunders

Sometimes a horrible blunder can ruin not just a game or a tournament, but a whole chess career. Remember that a false sense of security usually leads to blunders. You should not think that premature relaxation happens only when you have a winning position.  Sometimes when your game looks like a "dead draw" you start thinking that the game is already over while it is still in progress. As long as the game is still in progress, it doesn't matter if the position is 'completely winning' or a 'dead draw'.  Once you start waiting for your opponent to resign in his lost position or offer a draw in a drawn position, you are almost doomed to commit some stupid blunder. The funny saying "it ain't over till it's over" should be the first thing on your mind whenever you get a winning position.