When I first started playing Hold-em I had watched it so much on T.V. hearing pot committed that I actually thought you had to become pot committed at some point in a hand. I was a blackjack player, and sometimes I have wished I could go all in playing BJ
I have found after playing a lot of Hold-em that you can never let your chips over rule your brain. If you have a bad hand when the turn comes it's probably going to remain a bad hand if it's still bad on the river it's just a bad hand. FOLD!!
On the other hand if you have a real good hand and you think you have the nuts or are going to next card then you are card committed not pot committed, you should play the hand not the chips.
I found out last weekend in a tourney that being card committed as well as pot committed can kill your stack. I had pocket AdAh, flop was AsKsKh, check to me I bet 30,000 and was called, turn was Jh, check to me I bet 30,000 and was called again, and the river 10s. The other guy went All in for 20,00 I quickly called thinking like a moron you can't beat AAAKK with the cards on the table. Well yes you can all you need is the Qs and the Js. We showed our hands I had A's full of K's My opponent had AsKsQsJs10s. Yep lost 80,000 chips to a royal flush, which left me with about 25,000 chips.
Next hand AA again got beat by a straight 23456. Took me down to 12,500 chips. I there was two tables left, and I had the shortest stack so I went into only play good hold cards mode, and wound up going out 4 hands later. I should write a poker book myself, "Going from Chip Leader to Out in 10 hands or Less!!!" I think the only time you should be pot committed is when you are already All In.
Bob
The Dog