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 Originally Posted by biondino
]Robb, if it doesn't take ages I would actually like to see the maths behind your post, or at least some kind of workable percentage by which the blinds are likely to have A Good Hand of some kind. My suspicion is that there is less of a difference than you may instinctively think but I really can't tell if that's false instinct without the numbers!
(an example - yes, people in MP and EP are likely to play high aces, but maybe only 1/4 of all aces will be strong enough to play, so it is likely a lot of them will have been folded, and even more so with kings, queens etc.)
This has proven exciting. Didn't think the mathematics would quite this hard. Here are the assumptions:
1. Hero is on the button in an unopenend pot (7 flods, no limpers).
2. Here has T9 or worse, and wonders about the chance of facing overs from the blinds.
3. All players who folded would have opened any pp and all unpaired face cards except QJ. Not arguing this is best strategy, just suggesting it because it makes the math reasonable. And it makes some degree of sense.
First, let's look at the odds of hitting these hands in general given the 1326 different starting hands possible:
AA 6 ways to make it, so 6 /1326 = 0.04525, or 0.045% chance
KK - 22 same as aces, so total pp is 13 x 6 / 1326, or 6% chance of pp
AK 16 ways to make it, 16 / 1326 = 0.0121 or 1.2% chance
AQ, AJ, KQ, KJ are same, so about 6% chance of these holdings
Recap: 6% chance of pp (actually 5.88%), 6% chance of AJ or better, KQ, KJ (actually 6.03%).
EDIT: TLR WAS RIGHT. THE 2 PARAGRAPHS CONTAIN AN ERROR (IN BOLD).
We don't know exactly what folders had, but we do know what they didn't have. We can rule out the 80 holdings that are pp J or better and the 54 pp that TT or worse. The hands we are ruling out are Aces/Faces to T or worse in a 3:2 ratio.
We've inspected 8 hands, so we "know" 16 cards came from combinations NOT in the premium category. Round this to 15 cards, and the 3:2 ratio suggests that 3 MORE Aces/Faces ought to remain than average random dealing would suggest.
EDIT: I WILL CORRECT MY POST BELOW, SO THE THREAD WILL STILL BE READABLE.
This leaves two hands to be dealt from the remaining 36 cards of which, normally 4/13 would be Aces/Faces (about 11). Here, however, we're anticipating a slight over-representation of Aces/Faces. So assume on average the breakdown can now be assumed to be 14 Aces/Faces and 22 other cards. Now there are only 630 combinations possible for starting hands (36 choose 2). Here is the same breakdown as above assuming the 14 cards leave us with 4 Aces, 4 Kings, 3 Queens and 3 Jacks, on average.
AA 6 ways to make it, so 6 /630 = 1% (actually 0.95%)
KK 6 ways, so 1%
QQ 3 ways, so 3/630 = 0.5%
JJ 3 ways, so 0.5%
AK 16 ways, 16 /630 = 1.2% chance
AJ 12 ways, or 12/630 = 2.54% chance
KQ and KJ same as AJ, so 2.54% chance each
Recap: 2.86% chance of PREMIUM pp JJ or better, and 12.7% chance of AJ or better, KQ, KJ, nearly double their typical frequencies.
If solid/premium holdings occur 10% of the time in general, then we would have an 81% chance typically of facing two random opponents WITHOUT a premium holding : (1 - 0.1)^2 or 0.9^2 . Now we have a situation where premium holdings may be as much as twice as likely, so we have a 64% chance of facing the SB and BB WITHOUT them holding premium hands : (1 - 0.2)^2 or 0.8^2.
Critique this as much as you like. The assumptions are not necessarily representative of true game conditions, but the basic facts are startling, even for me. With some conservative tweaking suggesting the Aces/Faces might be a bit less over-represented than we assumed, we can still guess that the actual likelihood of premium holdings from the blinds in this situation is at least 50% greater for each of them, and there is as much as a 10% greater chance of facing a premium holding out of the blinds in this scenario.
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