Is it ok to....

[Jibalob]

play massively under-rolled when you're playing a complete moron Heads-Up? This guy was playing terribly and kept going on about how he was a pro (this is a 1/2 6-max game btw) and after I spanked him for about 20bbs in very few hands he challenged me to play a HU 4/8 game.
My roll was about $1000 so I thought, give it a few hands to make sure he hasnt suddenly started playing really well then go for it.

To cut a long story short, after 30mins heads up my BR is now $1,300...

[HiLo]

Depends how easy it would be to get replenish your BR from other sources if you lose it. Remember even the biggest moron can crack your flopped top set with a runner runner draw and take your whole stack.

If you have spent ages building up you roll and no easy way to top it up if you lose then you should definitely pass up these so called easy money opportunities.

[topsoyale]

Explained very clearly above.

It's very different if you are slightly under rolled.
For example if you had just moved to 1/2 NL and saw an absolute idiot at 2/4NL who barely has enough brain power to click the bet, fold or check button, then a shot is fine.

Massively under rolled just don't try it.
Too much to lose on one bad beat.

[2_Thumbs_Up]

It's very different if you are slightly under rolled.
For example if you had just moved to 1/2 NL and saw an absolute idiot at 2/4NL who barely has enough brain power to click the bet, fold or check button, then a shot is fine.

It's also important that you have the discipline to not freak out if you lose 1/5 of your BR. I had to withdraw some of my BR a while back. I then took a shot at 200NL when I was at 3k. I knew I could beat both 100NL and 200NL and there was no risk of me going broke, so if things didn't work out I could just grind it out at 100NL to replenish the money. It's important to know you won't tilt though.

[Jibalob]

Explained very clearly above.

It's very different if you are slightly under rolled.
For example if you had just moved to 1/2 NL and saw an absolute idiot at 2/4NL who barely has enough brain power to click the bet, fold or check button, then a shot is fine.

Massively under rolled just don't try it.
Too much to lose on one bad beat.

Ok, so I suppose I should just count myself lucky this time and try not to do it again.

I would have given it a miss but this guy was unbelievably easy to read. He slow-played every made hand / pocket pair and bet out extremely quickly (including 3-bets and caps) when he had nothing. Basically trying to bluff every pot on every street. I figured even if I only showdown the best hand 1 in 5 times I'd still rip the guy apart as he gets no money in the pot when he has a hand and literally throws money at you when he has nothing!

[sejje]

Ok, so I suppose I should just count myself lucky this time and try not to do it again.

Nono, play that guy every chance you get until you're totally at risk of going broke.

There's nothing wrong with taking a shot there, you just have to quit if you lose too much, and leave yourself enough to come back. That's all. Shot-taking is all about discipline. Put yourself in a good game? Of course. But if it doesn't work out, step back and do what you need to do. If it works out, well....