[Sounded Simple]

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I do not have the book yet, but judging from the excerpt in the 2+2 magazine I am wondering if the concept of "planning hands" by chosing a certain amount to raise pre-flop isn't giving away too much information. Basically a smart opponent who knows this book should be able to put me on a range based on the size of my raise. So how much info does the book contain about ballancing frequenzies?

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If you were following the books applications you would be making all sorts of different sized raises.

There is some info on mixing it up to avoid being able to be read by good hand readers.

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When I first finished the book I thought this would be a problem too.
However the problem solves itself in a way as long as you let your stack size vary naturally.

Say you start with 100bb, you will make certain size raises with certain groups of hands to aim for your target SPR.
If your stack increases to 150bb (and you are playing other 150bb stacks) then the required raises for the same hands.
If your stack (or the effective stack) drops to 70bb then your raises vary accordingly.

Now thats not to say that clever oppponents wont realise the situation and interperet your raise correctly - I have not played enough with SPR to know if this happens.
At the same time to a random player who doesnt know what you are doing your raises will look random - even strange.