REUBEN FINE was an International Grandmaster and one of the world's greatest chess players ever. His books, including "Basic Chess Endings "and "The Middlegame in Chess," are among the all-time classics of chess literature. PAL BENKO, reviser, is a Grandmaster who has been twice a candidate for the World Championship. He has finished atop eight U.S. Chess Opens, and has achieved an outstanding record in chess olympiads as a player and as a team captain.