Thanks Ed, a very fasinating insight you have given me. It shows quite clearly what most average checker players (like myself) don't realise and thats the sheer scale of this great game.
It reminds me of the Tinsley V Chinook match, when Tinsley worked out that the computer could "only" see 26 moves ahead in all variations (millions of moves). So in order to win he was looking 27 moves ahead. A genius.