[iopq]

The branching factor is much larger, around 75 legal moves after the opening, while chess has at most like 30.

Fuego beat a pro in 2008 using MCTS actually.

[pavelrub]

The branching factor of 9x9 Go isn't 75. 75 could be the factor in early game, but the average factor is somewhere between 40 and 50, versus 35 in chess. State-space complexity is also considerably higher in Chess than in 9x9 Go.

Not sure what you meant regarding MCTS, I never said anything about MCTS not being able to beat pros.