[51] During WWII, an unwritten qualification for an officer's appointment to Eisenhower's staff was the ability to play a sound game of bridge. He played even during the stressful weeks leading up to the D-Day landings. His favorite partner was General Alfred Gruenther, considered the best player in the U.S. Army; he appointed Gruenther his second-in-command at NATO partly because of his skill at bridge. Saturday night bridge games at the White House were a feature of his presidency. He was a strong player, though not an expert by modern standards. The great bridge player and popularizer Ely Culbertson described his game as classic and sound with "flashes of brilliance" and said that "you can always judge a man's character by the way he plays cards. Eisenhower is a calm and collected player and never whines at his losses. He is brilliant in victory but never commits the bridge player's worst crime of gloating when he wins."Bridge expert Oswald Jacoby frequently participated in the White House games and said, "The President plays better bridge than golf. He tries to break 90 at golf. At bridge, you would say he plays in the 70s.