In the very beginning UeL was absurd. I remember being in a bunker with a bit of downslope. Even my lob wedge wouldn't clear the lip. Gave up on it.
Later, WGT improved it, so I gave it another go. True, many of the things I'd do IRL aren't available, gripping down, flexing the knees, etc. Now I enjoy playing them. I sponsor weekly tourneys that feature a handicap system. The handicap is similar to the USGA method. We've assigned slope/rating for the main 10 courses.
One thing I did when I introduced the concept to the club was to put up a very simple UeL primer. I'm told that it was quite helpful in getting people in the ballpark with the concept.
Most of the folk who participate have handicaps in black figures. Mine is currently +4 and occasionally goes to +5. Anyway, I've never put the primer up on the main before.
Here it is, FWIW.
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How I play unevens.
On the tee.
In even lies just hitting the fairway is good enough. In unevens finding the flattest part of the fairway is the way to go. I've played enough unevens that I don't have to do this, but using the fairway cameras to scope out the landing area can be beneficial. A good example is #18 StA. On the right you have the hills and dales, but on the left is the FLAT fairway of #1. Yes, you have a longer approach, but you also have a much flatter lie.
From the fairway - approaches.
How much to allow for left/right - I try to match the angle as indicated in the lower right lie indicator. This tends to be constant. Regardless of lie expect to lose some power. I generally add 4-5 yards to the calculation. Even with a black lie, I'll add a couple. Look at your target. Is that a sucker pin - hard to hit? Go for the middle of the green and two putt for par. Drop a long one and rejoice or settle for a well deserved par.
Oops - missed the green. Still try to dupe the angle, but now the side dots are important. Usually front to back. 2 seconds -Double the distance. 4 Seconds -1.5. 8 Seconds - 1.25. This is a fairly straight progression so niggle other timings. I've holed out a few of these - truly gratifying in unevens.
Red lies around the green: Just get the ball on and do no worse than bogey is a fine outcome.