A Quick Study in Confirmation Bias
Lately it has felt like everytime I raise broadways out of position against a limper, that the flop comes all low cards. I learned in Matthew Janda's book (great book) that the flop comes 8-high or lower only 15% of the time. It has felt like it has been occurring a LOT more often than that, to the point where I wanted to go to my HM and check things out. Ideas such as the site's RNG being shifted or the author making a mistake in his calculations crossed me mind as seemingly plausible explanations. Even though these ideas seem outlandish, when something just doesn't "feel right" our brains tend to grasp for explanations.
Here is what I found in my database running a quick filter:
A - 123
K - 92
Q - 101
J - 57
T - 63
9 - 46
8 - 42
7 - 20
6 - 17
5 - 12
4 - 5
3 - 1
2 - 0
8 or lower occurred 97 times = 16.6%
(the above frequencies are roughly what they "should" be btw)
I notice that my non showdown winnings took a hit over the last 100-150 samples. I think this likely means that over that sample, I happened to run into situations where I had to x/f flops more often that normally occurs. After enough of these, some frustration started to accumulate, and I was probably looking for spots to "prove" that this kept happening more than it "should".
The point of this is to help me see how variance can undermine even things I know as poker truths, and to be mindful of the fact that the negative variance I am experiencing can bleed over similarly to other areas of my game. For example, today I almost checked back a clear river value bet because I felt like they've just had it so often lately. I ended up thinking it through and making the correct play, but I need to be extra self aware that my brain is searching for instances to "prove" I'm running bad. I have to resist the urge to change sound strategies just because I feel like I need to do SOMETHING different to turn my results around. It will be easy to get a run of unsuccessful cbets, for example, and start wanting to check too many flops - in the same way that I have been tempted to just complete the SB with clear raising hands vs BTN open limps lately.