Here's an interesting profile of the INTP type, probably the most winning online-poker type.
http://www.geocities.com/lifexplore/intp.htm
INTPs exhibit the greatest precision in thought and language of all the types; they tend to see distinctions and inconsistencies in thought and language instantaneously. The one word which captures the unique style of INTPs is architect-the architect of ideas and systems as well as the architect of edifices. This type is found in only 1 percent of the population and therefore is not encountered as frequently as some of the other types.
INTPs detect contradictions in statements no matter how distant in space or time the contradictory statements were produced. The intellectual scanning of INTPs has a principled quality; that is, INTPs search for whatever is relevant and pertinent to the issue at hand. Consequently, INTPs can concentrate better than any other type.