Regarding 2, the point is that a valid move in Go is to put a stone everywhere on an empty position each turn on 19x19 grid. So the number of valid move is not

Regarding 2, the point is that a valid move in Go is to put a stone everywhere on an empty position each turn on 19x19 grid. So the number of valid move is not comparable at all with Chess. You can check for more information : https://en.wikipedia.org/wiki/Go_and_mathematics https://en.wikipedia.org/wiki/Go_and_mathematics Related : https://en.wikipedia.org/wiki/Shannon_number https://en.wikipedia.org/wiki/Shannon_number From these two links, the game tree complexity of chess is estimated at 10^120 while for Go it is 10^700. Not really in the same ballpark.