Figure[White to move]

Acknowledgments and Bibliography.

Alon Cohen.

I now wish to thank two gentlemen, each of whom has lent a bit of his genius to this project.

The first is Alon Cohen, the builder of this site, pictured to the left. He is a man of surpassing energy, generosity, and creativity, and I hope you will share my judgment that he has done a beautiful as well as a functional job. We collaborated on the design; anything you don’t like about it safely can be blamed on me, while the good parts almost certainly were his idea.