CFK:
Thanks for the incredibly quick reply. If I understand your question correctly (I'm not totally sure I do since I don't know what in real life would correspond to the scores so I can try to give a few examples . . .), yes, I think so.
My son started reading on his third birthday (which doesn't seem super abnormal from asking friends, although they may not be the best sample). By age four, he was beating me 95% of the time at the memory game where you put 50 or so cards on a table and flip them over in pairs. At age 7, he is now beating me at chess 75% of the time even if I try my hardest. [Caveat: I'm no chess expert, having played chess maybe 75 times in my life and have never read any chess strategy but I'm an Ivy League grad and (I'd like to believe

) no intellectual slouch] He has learned Spanish incredibly rapidly but that doesn't really seem abnormal.