This is quite clear about online situations. You decided to open your browser while playing at 6-10 tables to check if there is anything superimportant on the internet you missed when you were offline. A table window pops up in the most convenient moment (no, that's not true) and instead of reading about Ronaldo's move to Juventus you push fold with AA when two players before you have already gone all-in.

For the next few days browser is shut and CR7 is the most hated footballer ever. Who is to blame then if not him?

But there are even more sophisticated misclicks in a live game. No, that's not a situation when you make a bet on the phone instead of taking chips. And not even the moment when an ashtray flies into the dealer. Any other guesses?

Wynn and Encore casinos are one of the most beautiful ones both outside and inside among the venues I have played in Vegas. But every time I recall those tournaments I have goosebumps, and only their chips are in front of my eyes.

I played less than 10 tournaments in 3 weeks there. And during these 10 tournaments I somehow managed to mix up denomination of chips three times. First I made a continuation bet of 7K instead of 2K I had planned. I understood something was wrong when the opponent stared at me in astonishment. Then I raised 7000 instead of 2500 before flop, the guy after me went all-in 8K and I had to add 1000 and beat his AK with my JTs. In this situation I was calmed down that even if I had not make a mistake, then according to mathematics I would still need to add until his all-in. But the third time it was not that innocent. It was my first tournament in Vegas with a $400 participation fee. I raised preflop 6300 instead of 1800 and I had to add according to mathematics against a 17K all-in and this time I did not manage to win. The opponent had AA, and I had a KTo. And this time I started analyzing.

This happens only in this casino. With the same stack of chips. But the most unclear thing is that in every of three situations I mixed up a 500 chip with a 5K one. How's that? Remarkably they do not look alike at all! One is heaven-blue, the other violet. The whole table thinks I am an idiot, and I am just sitting there trying to understand this enigma.

But then I did understand! In Rio where Poker World Series is played in three tournaments in which I advanced to deep stages (100th of 8500 in a $888 tournament, 101th from 5000 for $1111 and 58th of 3500 for $1500) we played with the same stack of chips. This stack rooted deeply into my memory. Those were the most beautiful chips I've ever had in my hands. They were like multicolored lollypops you want to eat. And I remembered those juicy colors very well. Emerald 25s, black 1000s (like in Encore casino), lemon 1000s (again full match), robin 5000s and… drumming violet 500s. Everything was on its place. My brain just remembered that 500s are violet, and fatigue multiplied by 45-degree heat prevented from total concentration. This is the story about unprofessionalism of a professional poker player.

How do you fight it? Have a day-off next time you feel tired!