At least one person simply asks on Math Stack Exchange ... https://math.stackexchange.com/users/11955/ed-pegg https://math.stackexchange.com/users/11955/ed-peg

At least one person simply asks on Math Stack Exchange ... https://math.stackexchange.com/users/11955/ed-pegg https://math.stackexchange.com/users/11955/ed-pegg but yes, I suspect that when you get very familiar with the mechanics of the game, solutions become obvious. Or they construct 'backwards' from the solution to a problem, maybe.