Originally Posted by JKawai
For example if I've 8 outs (open straight) then my odds of making this by the river are 2.17:1. Originally if the pot were $100 I would have bet $85 in this situation to offer my odds, but then if it goes to the next street... I'll have to bet again...
However, perhaps the whole point of betting the 2.17:1 odds is to try to get opponent to fold as well? Because they ARE your odds whether you hit or not. So if they call, it's obviously profitable for them, meaning they have those odds or better (hypothetically speaking). ...
OK, as you say you have 8 outs and this gives you 2.17:1 or 31% to hit by the river
(I prefer percentages, although with a little practice you will soon think of this (31%)as about 2:1 anyway).
One advantage of percentage is that you can use the 2&4 rule to quickly calculate rough odds. Multiply your 8 outs by 2 to get 16% chance of hitting your out in one street (by the turn) or multiply by 4 to get 32% aproxx odds of hitting in 2 streets (flop to river).
As you have correctly noticed you should always
be working with the one street 16% chance if you may face a bet on the turn and you would only
use the 4x (32%) if one of you is all-in on the flop. Only
in this instance would you genuinely be calculating your odds over 2 streets.
Now, in your example you suggest that you would bet $85 into a $100 pot when you are drawing to a straight.
First of all the figure is way too high, if you bet just over half pot you are providing the odds of 2:1.
But much more important is that this more something that you might do when you have the best hand
and wish to prevent someone else drawing their flush or straight.
If you have top pair and top kicker or a set for example, but there are two spades on the board, you might bet over half the pot to make it unfavourable for your opponent to draw to the flush (of course over one street it is actually less than half pot)
The important point here is that if you are the one with a draw, then probably the best line for you is a free card. If you check, and your card comes you have a great hand, if it doesn't come you still have another street and you haven't risked any more chips.
Of course if you have great draw, a bet may push your opponent off their hand completely, you win there and then and that is a valid play, but you certainly shouldn't feel that you have
to bet to draw.