Following on from the previous post....
I remember watching an interview with Chris Moneymaker after his WSOP Main Event win in 2003.
He stated that when they got to heads-up he offered Sammy Farha a chop of the prize money. Farha quickly declined.
The impression Moneymaker got was that Farha felt he was the better player and as such...expected to win.
Moneymaker was annoyed by the arrogance of his opponent and was determined to play Farha off the table because of it.
We all know that heads-up play is a psychological battle and the two players had very different mentalities as play commenced. Moneymaker was an internet qualifier who had already gone much further than he could ever have expected. The second place prize money was plenty enough to be satisfied with and now all he wanted to do was steam-roll his arrogant opponent to the rail. Farha on the other hand still had the weight of his own expectations on his shoulders. He was playing to win and only first place, the bracelet and the title were going to fulfill his own particular goal.
Although Sammy Farha is world class and probably a much better player than Chris Moneymaker I think his mindset of first or nothing actually handicaps him here. His brain is still sub-consciously protecting him from the "gutted" feeling of not winning.
Moneymaker couldn't care less either way....he's just annoyed now.
Example hand to demonstrate the difference in mentality.....
Moneymaker

Farha

Moneymaker raises to $100k and Sammy calls
Flop comes

Both check
Turn comes

Sammy now bets $300k into a $210k pot....Hmmm
Moneymaker re-raises to $500k and Sammy calls
River comes

Sammy checks and Moneymaker moves all-in.
Farha actually says...."you must have missed your flush eh?" before eventually passing.
Sammy Farha, a notoriously aggressive poker player played this hand like he was scared to loose. He checked top pair on the flop, over-bet the pot on the turn, weakly called the re-raise when he could have pushed himself and then check-folded the best hand on the river even though he put Moneymaker on a missed draw. Moneymaker on the other hand just hammered his opponent into the ground.
I think a good theory to explain why Farha lost this battle was because he played to win. This created a scenario where sub-consciously he wanted to withdraw from dangerous situations to protect himself from loosing.
So can we say that playing to win may be a handicap?
Just a theory....but then again work is really boring today.