John N. Hansen: Chess 4, Black Chess 4 Chess is no longer just a battle, now it’s war! The rules are the same but, the game is dangerously different. Product Description 20" x 20" board, 1 set gold, black, silver, ivory men, King measures 2.5", Includes rules for Chess Four and traditional chess Chess 4 allows four players. Same rules, same playing pieces, just played by up to four people. Chess Four is the world's most accepted non-traditional chess set.