It ain't the heat, it's the humility

This one qualifies as Yogi Berra Chess Guru, Part III:

Once during a hot summer Yogi complained, "It ain't the heat; it's the humility."

Humility isn't something the average chess player has to worry about but sometimes when we're pitted against an opponent rated a few hundred points above us the psychological factor comes into play and we sit at the board expecting to lose. It was Yasser Seirawan who observed that under-confidence and over-confidence are both failings but, of the two, under-confidence is the worst.

There was a David and Goliath battle in the third round of the Australian Open a couple of years ago but paradoxically David was Goliath.

IM David Smerdon (Goliath) just back from a successful Olympiad and rated 2431 was challenged by Jason Hu (David) rated 1873. Jason didn't let the 558 rating points separating them bamboozle him and set about giving his stronger opponent a chess lesson.

It's an entertaining game and worth playing through.