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Bot Comparison S4 & Gnubg Snowie ERs

Posted By: Timothy Chow
Date: Monday, 26 April 2010, at 9:40 p.m.

In Response To: Bot Comparison S4 & Gnubg Snowie ERs (neilkaz)

neilkaz wrote:

Once again I have to say that never in my wildest dreams did I expect XGR+ to be 5.5 Elo stronger than 5-ply.

It's worth remembering that we're using GNU rollouts as "ground truth." It is to be expected that XGR+, being based on rollouts, will tend to agree more with GNU rollouts than a 5-ply analysis would, because they're approaching the problem in the same manner. Conceivably, some of the positions that are being labeled 5-ply "errors" are actually being played correctly by 5-ply and misplayed by both XGR+ and the GNU full rollout.

I still expect that XGR+ is stronger than 5-ply but one has to be a little cautious about drawing precise quantitative conclusions because of the above bias.

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