To be honest, I'm not sure which percentage would be correct to mention in this context..for sure, luck plays a certain role in poker, mainly in terms of how the board comes. As an example: In a freeroll, final table, I got QQ. Another Player had AKo - goes allin, I call. Board included AA, giving him trips. Next, I got AKo. I go allin, another Player calls with JJ. Board offers me nothing, so I lost here as well. Sometimes you loose, sometimes you win..that's why I believe, even being super skilled and careful as a poker Player, if it is not your day, you can't force it. Saw even a guy like D. Negreanu walk out of a big Event quite earlier, because of bad luck in Terms of how the board came.