[Bug-gnubg] Player Records Overall ratings

[Albert Silver]

I'm a bit confused by the overall rating given in the Player Records. I
began entering games but the overall rating seems weird. One record
looks like this:

Record #1

Total games:    52

Checker total:  -0.0148 Expert
Cube total:             -0.0081 World Class

Overall:                -0.0139 Expert

--------------------------------------

Another looks like this:

Record #2

Total games:    18

Checker total:  -0.0136 Expert
Cube total:             -0.0008 Supernatural

Overall:                -0.0161 Advanced


I don't understand why the second record's overall rating is Advanced if
the average checker play is Expert and the cube decisions are
Supernatural. 

                                        Albert