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What is XG Thinking here?

Posted By: Timothy Chow
Date: Sunday, 14 September 2014, at 5:19 p.m.

In Response To: What is XG Thinking here? (Tom Keith)

You're right, it has to be the magic wand. I was thinking that there could be floating-point roundoff problems with the 0-ply evaluation, but those would not result in an error of this magnitude.

By the way, here is an old post by Xavier addressing a related question.

If you think about it a bit, you can almost prove to yourself that the computer must, at some point, rely on something other than weighing market losers against market freezers to make its doubling decisions. After all, say it decides to look ahead to the next roll; it then has to assess an array of doubling decisions on the next roll, and how is it going to do that? Look ahead yet another roll? To avoid infinite regress, it must at some point do something more simpleminded than try to assess all market-losing and market-freezing sequences.

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