Book contains lines that go from proven draw to loss

[GoogleCodeExporter]

See this game played on GGS:

(;GM[Othello]PC[GGS/os]DT[2010.05.05_08:19:40.MDT]
PB[s26]PW[s20]
RB[2171.28]RW[2161.73]
TI[10:00/00:00/02:00]
TY[8]RE[-2.000]
BO[8
--------
--------
--------
---O*---
---*O---
--------
--------
--------
*]
B[E6]W[F4//12.93]
B[D3//0.01]W[E7//11.84]
B[F6//0.01]W[D6//7.66]
B[C6//0.01]W[C4//8.22]
B[C3//0.01]W[F7//12.75]
B[C5//0.01]W[F5//17.22]
B[F8//0.04]W[C7//17.36]
B[D7//0.01]W[B5//13.16]
B[C8//0.01]W[B4//12.42]
B[G5//0.01]W[B6//7.53]
B[G4//0.01]W[G6//2.17]
B[G3//0.01]W[E2//0.02]
B[D2//0.01]W[F3//0.01]
B[E3//0.01]W[F2//0.02]
B[B3//0.01]W[C1//0.01]
B[H6//0.01]W[G7//0.01]
B[H8/-1.00/299.09]W[D8/4.00/0.02]
B[C2/-2.00/41.21]W[A2/102.00]
B[E1/-2.00/21.94]W[G1/1.00/10.49]
B[E8/-2.00/0.10]W[B1/2.00/7.20]
B[A6/-2.00/0.10]W[G8/2.00/0.09]
B[A4/-2.00/0.10]W[A7/2.00/0.09]
B[D1/-2.00/0.10]W[F1/2.00/0.08]
B[G2/-2.00/0.10]W[H5/2.00/0.08]
B[H7/-2.00/0.10]W[B7/2.00/0.08]
B[H4/-2.00/0.09]W[A3/2.00/0.09]
B[A8/-2.00/0.09]W[B8/2.00/0.07]
B[A5/-2.00/0.09]W[B2/2.00/0.07]
B[A1]W[H1/2.00/0.07]
B[H2]W[H3];)

it seems the line actually is drawn but there is a losing move at H8. There 
needs to be a way to filter that kind of moves.

Original issue reported on code.google.com by dlidstrom on 5 May 2010 at 2:35