The recent change to oob's handicap calculation is wrong. It's truncating each differential down to the tenth, but it should round, not truncate:

10-1. Calculation of Handicap Differentials

A Handicap Differential is computed from four elements: adjusted gross score, USGA Course Rating, Slope Rating, and 113 (the Slope Rating of a course of standard difficulty). To determine the Handicap Differential, subtract the USGA Course Rating from the adjusted gross score; multiply the difference by 113; and divide the resulting number by the Slope Rating. Round the final number to the nearest tenth.

So, for example, if I shoot 89 on a course rated 69.8/131, that's a differential of 16.562, which should work out to 16.6, not 16.5 as oob is doing.

I know this is a minor thing, but I also know that the intent was to make oob's handicaps as close as possible to the USGA's, and this change achieves the opposite.

I noticed the same thing, but Andrew believes that the USGA is calculating differentials incorrectly...

I don't think the USGA is wrong (they write the rules, so they have to always be right). We had another user convince us that based on 10-2 Step 5 that we should not be rounding the differentials but instead truncating. We now believe that this should happen only after they are averaged and multipled by .96. But in fact should be rounded before the average. This fix will go into place today.

Right, rounded before the average, then *0.96, then truncated. Thanks for the quick response!