What is the difference between graph search and tree search versions regarding DFS, A* searches in artificial intelligence?

I notice that some of the "hard" combinatorial problems I come across can be cast in terms of some type of tree search like alpha-beta pruning, or beam search, or a similar algorithm. However, prog...

I'm writing a distributed Go/Gomoku bot. Basically the point is to distribute tree search onto many computers. With basic tree search algorithms like DFS this would be very simple, as I could just...