Bruce Ferrie:
> AVG NEW ABILITY RATING
> 2W 12
> 3-4W 13
> 5-6W 14
> 7-8W 15
> 9-10W 16
> 11-12W 17
> 13W 18
> 14-15W 19
> 16-17W 20
> 18-19W 1W
> And so on if you want to....
Note that this table is as close to "halve the value" as to make very little difference (at least that I'd care about).
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