Last night I was in a single table no limit tourney. (my favorite) I was chip leader with about 10,000, next was a guy with about 6,000, and then there was a girl with about 2,000. We were all already in the money. The girl was the weakest player, she got to where she was by catching some really lucky cards on some questionable calls. The guy with 6,000 chips was actually a pretty good player. Usually in this spot I would try to squeeze out the short stack, but I decided to try something else. I decided I wanted to play the girl heads up because I knew I would win against her easily most of the time. And the other guy had been talking crap the whole tourney. So I left her alone and went after the guy. I kept betting into him strong making him fold and taking his blinds. I think he was playing too tight just to get at least the 2nd place money and to take his chances against me heads up with a short stack. At one point I actually folded a stronger hand to the girl just to give her a few chips so she would have a little bit more than the guy. The guy finally made a stand against me at the wrong time...I took him out with AK against J10. I took out the girl pretty quickly and won the tourney. Later after I thought about it, I decided that I really could have gotten burned by playing that way. This strategy worked that time, but was I lucky? And I almost felt guilty. Was what I was doing a mild form of collusion against the guy, or just poker strategy? What do you guys think?