My response was to a poster who said that we could beat Neanderthals at chess. Actually, Neanderthal brains were larger in the occipital and parietal areas, those areas directly involved with spatial orientation. Larger frontal lobes have little bearing on winning at chess.
http://www.chesscircle.net/forums/showthread.php?410-article-chess-and-the-brain
Sorry...do not buy it one bit; chess is partially about space, but mostly about thinking ahead and sorting through move probabilities of your opponent.