About two weeks ago I took Pebbles offline for an extensive overhaul of its
board representation. At that time Valkyria 3.3.4 had a 9x9 CGOS rating of
roughly 2475.

When I looked today, I saw Valkyria 3.3.4 rated at roughly 2334, so I
wondered what was going on.

I found a contributing factor: Valkyria has massively different results
against Pachi than against Pebbles. It happens that Pachi started playing a
day or two after Pebbles went offline.

Pebbles and Pachi are both rated around 2200, but Valkyria shreds Pebbles a
lot more often than Pachi:

    Pachi:   185 / 273 = 67.8%
    Pebbles: 429 / 503 = 85.3%

There are a lot of lessons here...

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