"Most gods throw dice, but Fate plays chess, and you don't find out til too late that he's been playing with two queens all along"

This quote by Terry Pratchett is a suggestion that life is unpredictable and that we are not constantly in control of our own fate. It suggests that while we may believe we are making our own choices, there is a greater power at work that is playing a game of chess with our lives. This greater power, Fate, is always one action ahead of us and has been having fun with two queens all along. This means that Fate has actually been in control of our lives from the beginning and has actually been manipulating the pieces on the board to attain its own goals. The quote implies that no matter how hard we attempt to manage our own fate, Fate will constantly have the upper hand. It is a tip that we should accept the truth that life is unpredictable and that we need to not take it for granted.