Not math or luck, but skill. By itself, mathematics of course plays a significant role, but you still need to apply this mathematics correctly, and this is a special talent, and not to mention that you can not make all the necessary calculations, even being a mathematical genius. And most importantly, poker is a game with incomplete information, you will never have enough information that you can correctly and accurately make calculations. In the calculation of EV (mathematical expectation), it is necessary to take into account such factors as the probability of the opponent discarding cards and the probability that he is bluffing, these parameters can only be assumed, just like possible cards, you put the opponent a range of hands and not always the estimate of this range will be correct, especially since strong players deliberately dilute their ranges with unexpected draws, and weak ones can simply behave logically. Well, of course, hold'em is also a psychology, and your own psychology is very important, falling into a gambling rush, tilt, making a mistake due to fatigue or inattention, you can ruin the result of several hours of competent play in seconds.
And as for the degree of influence of luck, there is a fairly accurate quote:
"1 day of playing poker is 90% luck and 10% skill, 1 year of playing poker is 90% skill and 10% luck."
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