That's a good question. It's almost as if they were all swallowed by a
super-massive black hole ;-)
Or perhaps they 'defected' to some other more 'lucrative' games/sports
(rugby, cricket) in which case it would appear that ladies aren't the
only ones that get 'distracted' from the game. It seems all Ugandan
chess players, regardless of sex, get to a point of diminishing chess
returns (for instance, consistently failing to make it on to the
Olympiad team) and just go, 'Scratch this! I need a life.'