I have to agree with you there. It's kind of like the boxer who used his opponent like a punching bag for 10 rounds, and coming out for the 11th, he trips over his trainer and sprains his ankle. And if that weren't bad luck enough, he loses the fight by a technical knockout, because his ankle has been sprained so badly, he hasn't got the strength to get up before the count.
The Injustice of this Game called Chess !
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I forgot the (GM) name but he summed it all up. You can be ahead on the chess-board in " Time, Space and Material" and still LOSE !!
"One bad move can spoil 40 good moves".
I've won games I didn't deserve to before... but I've never lost a game I didn't deserve to. 
I will never forget a good friend of mine who was rated about 1700( uscf) playing in a big tourny and had his higher rated opponent down for the count and was about to deliver the kill shot , On his very next move HUNG his QUEEN ! after he resigned he put his Queen back on the board and stared at that position alone at the board for over an hour. although this happened years ago it still makes me sad to think about it. 
Fiveofswords wrote:
you can always alter the way you play and attitude to make this sort of thing not happen. For example if I have a winnign advantage the absolute only thing i do is try to simplify the position. If im a piece ahead im totally fine with sacrificing that piece for 1 pawn to get a dull position. I have no goal in mind other than making the position as clear as possible.
Well you know your opponent is doing just the opposite by avoiding exchanges and trying to complicate the position or try and introduce "dynamic" elements into the position , winning a so called won game against a strong opponent can be extremely difficult.
Easy - none of your sadistic glee matters while you assume you're going to win handily. Reserve judgement until the game is over.
Fiveofswords wrote:
study endgames and look for winning endgames. Too many times at middle levels i see players win decisive material advantage and then still try to win more and complicate the position when they had a very simple way to force a won king and pawn endgame, say
That is the Key most players are still in "attack" mode after they have won a piece instead of forcing their opponent into "forced" simplification unless of course there is a checkmate to be had.
romancitoG wrote:
I have to agree with you there. It's kind of like the boxer who used his opponent like a punching bag for 10 rounds, and coming out for the 11th, he trips over his trainer and sprains his ankle. And if that weren't bad luck enough, he loses the fight by a technical knockout, because his ankle has been sprained so badly, he hasn't got the strength to get up before the count.
Haha, good analogy. 
You know what i am talking about , you kick your opponents butt all over the chessboard from the king-side to the Queen-side across ranks and down files. Then you make that one tiny unforced tactical MISTAKE ! and the tide turns that PATZER whom you have been Spankin for Hours an looked half-dead is now DANCING in the playing Hall !!
where is my checker Board !!!!!?????????