“The Squares of the City” is a tour-de-force, a disciplined exercise peopled originally by wooden or ivory or jade figurines, now fleshed and clothed and given dramatic life in a battle as ald as the classic conflict of chess. But these are real people. When heads roll, blood gounts out and drenches the remaining players while they watch in horrified fascination—until their turn comes. For it is a real game. And the players—especially the players—cannot tell the outcome. Even when their lives depend upon it