Books on the openings abound nor are works on the end game wanting but those on the middle game can be counted on the fingers of one hand.

I have also known some of the world's finest brains and some of these, though passionately fond of chess, have been pretty poor players. I used to know one of the world's leading mathematicians and whenever we played chess I had to give him the odds of a Queen to make matters more equal, and even then I always won.