Alan Cunningham, a well-known poker champion has a very interesting view of chess ...
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A chess game is 4 hours of intense concentration over the course of 4 hours. Then you do it again after trying to choke down some food. Poker is 1/2 hour of concentration over a span of 10 hours. Of course, I'm much more experienced at poker so most plays are natural as can be and I can find them without breaking a sweat. Even so, I don't find a slow chess game online or live with a friend stressful at all so there is just something about the tournament setting that ups the pressure. I need to convince myself to just have fun."
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Pogonina.