Hi David, You are right that non-determinism and bot blind spots are a source of problems with Elo ratings. I add randomness to the openings, but it is still difficult to avoid repeating some patterns. I have just noticed that the two wins of CrazyStone-81-15po against LZ_286_e6e2_p400 were caused by very similar ladders in the opening: http://www.yss-aya.com/cgos/viewer.cgi?19x19/SGF/2021/01/21/733333.sgf http://www.yss-aya.com/cgos/viewer.cgi?19x19/SGF/2021/01/21/733301.sgf Such a huge blind spot in such a strong engine is likely to cause rating compression.
Rémi
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