If I've decided I want to used a mixed strategy for some situations, like say for example when I have 88 in MP with a raise before me I'll reraise 10%, fold 10% and call 80%.

How am I supposed to make sure I'm keeping these percentages in the long run? Am I supposed to sit there at my computer with a D20 and every time this comes up do a roll for initiative? How are you possibly supposed to apply a mixed strategy in a live game?

to be honest your brain power is probably better used trying to figure out which of your options is best in any particular spot rather than trying to randomize

I think it was sklansky that suggests looking at your watch. Just imagine the appropriate sized pie slice on your watch face, and if the second hand happens to be within that slice when you glance at it you take that action.

I agree with Yaqh though.

HoH mentions the second hand of a wristwatch.

It should be possible to use the hundredths of second in a stopwatch for the same job.

Have you thought about how you would derive the weights for your mixed strategy?

Trying to go by random percentages is only going to hurt your game. What you should be doing is asking "in what situations do I need to call in order for my calling rate to reach 80%" and "in what situations do I need to raise in order for me to be raising 10% of the time?" You shouldn't just say "I'm going to call 80% of the time and raise the other 10%"

Something tells me that if you're asking this question, then you're probably not even playing in games where this sort of thing would be close to necessary.

In your 88 example, the only reason I could ever see for folding to an open raise would be from a tight raiser with insufficient odds to set mine. I guess you could make an argument for folding it vs an EP raise where a 3bet behind you is very likely as well. If you're getting implied odds to setmine you should at least call 100% of the time since its going to be +ev. Every time you fold you're giving up a small profit.

If you really still want to do it then I'm sure the second hand can work well enough, but I'd strongly suggest devoting the extra effort towards always knowing what your range is. When you know what your range is for checking/betting/raising and calling at any stage of a hand, you can more easily spot situations where you need to be value betting more, or where you don't have enough bluffs, or where your checking range is too weak etc.