[Bug-gnubg] Gnu 2ply seems too optimistic

[Mochy]

Recently I found 3 positions where Gnu 2ply evaluate the 
equity too optimistic.After the rollout or in Snowie evaluation (and
Rollout) , Those are actually huge pass.
Not only 2ply, 4ply also make similar mistakes.

I dont know if it is because of new build or not.
Any comments are welcome.

Here are 3 positions (Position ID / Match ID)
ZtvAAWBjN4MIDA / cAmgAQAAAAAA
bFsIOEhxOwcDIA / MAGgAVAAMAAA
xs7BAURwb4OFAA / MAHgADAAAAAA

Mochizuki Masayuki (mochy)
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