Poker is Gambling. Chess is not.
This subject keeps coming up and up, and my answer is always the same: Of course Poker is gambling. You're risking money on an uncertain outcome -- a gamble. However, gambles come in three varieties.
1) -EV: This includes games such as Craps, Roulette, the Slots, and all the other games I never play. You can get lucky and win big, but over many plays, that -EV will eat you alive.
2) 0EV: Bet a dollar to win a dollar on the flip of a fair coin fairly tossed. You neither win nor lose over the long run.
3) +EV: Casinos don't give you these bets unless it's by mistake, part of a promotion, or a progressive slot jackpot that grows high enough to make it +EV to play for it. You can lose and lose big over a limited interval, but inevitably, you profit just as surely as the Roulette wheel wins for the house.
The only way to gat +EV bets are with games the casino doesn't bank. That would include horses, dogs, sports, Hai-Jahlai, other parimutual propositions, Chemin de Fer (watch out for this one as the rake can swing it -EV) and Poker. You can win at all of them if you have the
SKILL to recognize overlays. As Bobby Baldwin pointed out the good Poker player doesn't depend on luck: he's at war with luck.