Jacques,

(Offline)

Are you saying that you copy the whole board for each move,
when you have a "stack of boards"?

Thanks,
Michael Wing

> Well, every implementation is different. In its slowest 
> mode, my board stores information about neighbor stones 
> in each cell. It has a stack of boards and each board has
> a pointer to its parent. In that mode superko can be 
> detected. There is also a faster mode for MC playouts
> that does not support superko. But it could also be 
> possible to maintain a stack of previous hashes i.o.
> complete boards, that would not be very expensive.

> > Another cost is undo. Superko requires undo, unless
> > you want store a hash value with each chain of stones.
> > I am not sure exactly what undo costs, but lets say
> > 5% to 10%.

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