 In most cases, they are round-robin tournaments, where men's groups are of 14-16 players, while the women's are 12 to 14.There were only four Swiss system tournaments in men's tournament history (1975, 1976, 1977, and 1979) and seven in women's (1959, 1965, 1966, 1975, 1976, 1977, 1978).Twice (1937 men and 1962 women) final tournaments attracted international players, however in 1962 medals were awarded only to Polish women players.