[Computer-go] effectiveness of transposition tables for go

Mark Boon tesujisoftware at gmail.com
Sun May 9 14:00:33 PDT 2010

On May 9, 2010, at 8:55 AM, Greg Schmidt wrote:

> Yes, that' how it's typically done, but I don't see how that leads to finding *all* parents of a given node.  The situation I'm referring to is when you're propagating the UCT value back up the tree following a simulation.  If you also want to update *all* parents of that node (not just the single parent within the simulated line of play), how would you find *all* of them?  The parent nodes will have different hash codes (and be in different chained lists) in your representation.  Therefore I don't see how this representation is able answer the question "give me the list of all parent nodes which point to this TT entry" (unless I'm missing something).

I think you're missing something. If I reach a node, I look up what other nodes have the same transposition value. Each of those nodes knows its single parent. Nodes do not have multiple parents stored explicitly.


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