# Poker in Theory - Constructing Preflop Ranges (1)

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## Description

Our coach comes back with the first part of the "Poker in Theory" series in which he will be focusing on theoretical aspects of the game. The first part is all about constructing preflop ranges. The previous series called "Poker in Practice" is available here.

## Tags

• #1

Hi,
Basic defense Formula is not correct, even as an approximation. It should be this:

(%3bet * -2.5) + (1-%3bet) *(%called * EV-when_called + (1-%called) * (%steals * 1.5)) = 0

In your formula, you assume that you win 1.5bb when you steal but you have to account that you win it only when your opponent folds. Similar goes for all events (3bet, call, steal).
• #2

sorry my bad for the formula
• #3

On basic defense formula I dont understand why EV-when-called should stay low. I mean, the higher it gets the less profitable it is for villian and less motivated to OR his bottom range.

I know the only way to make it possitive is by 3betting 30% (ev-when-called=0 regardless our calling range) or more. And that is way too agressive and may have an exploitative adaption for villian.

But my point is the closer it gets to a possitive number, the harder it gets to villian to recover de -2 bb investement. In the video you say we should want this number low and negative but not beyond -2.5 as it would be profitable for villian just check/fold any flop and I get it, but I think the further we stay from that -2.5 mark, going up to 0 the better for us.
• #4

Sorry for my english :P
• #5

@canad32 - I guess you realised eventually that the frequency of the events occuring was taken into account as it should be.

@rorro - obviously the more we make when the weakest hand in our open-range gets called the better. But we have to be realistic here. If we are not losing money with the weakest hand in our opening range when villain cold-calls in the blinds, it means villain is doing somethng seriously wrong postflop.

And yeah, that's clearly great for us. But we need to assume villain is at least reasonable in order make realistic estimates. Which means the weakest hand in a theoretically correct opening range will lose money when it specifically gets cold-called, but not a super largeramount, otherwise it's no longer a theoretically correct open.
• #6

Thank you for help, I learn so much on this site.. I hope I will become better palyer :)
• #7

Hi w34z3l, you said in the video that both blinds should defend "together" against a BU open, but should BB defend a higher % of the time (relative to the SB) since he has better odds to do so? If so, how do you calculate this difference?