Originally Posted by Patch
The math formula is predicated on using only one stroke for any club being used. ...
Most of the time, for me, it's either a PW or a 8i. My PW is pretty much 50% air time, and 50% roll. Some folks call my PW chip shot, a pitch shot due to the air time involved. They may be right. My 8i is around 30% air time, and 70% roll.
I tried the Rule of 12 for a month a couple of years back, but got too little roll with wedges and too much with the 7, 8 irons. And, the Rule wasn't worth much on uphill and downhill chips.
I chip and run more than most people, using mainly 8i or PW. Length of backswing helps govern distance.
Another factor is the ball you use. I use mid-spin balls, as they seem to have the smoothest release. Right now I'm using the Callaway SuperSoft.
A couple of things: I need to be about 25 feet from the pin to have an 8i shot stabilize and roll. Any closer, I use a PW.
Second, SuperSoft doesn't bite very well on short pitches. I need a half swing to get it to check up any at all. (Got better check spin with TF Gamer.) But for a chip shot, SuperSoft is a great ball.
Note: At June's Curtis Cup matches, the British amateur women had a better handle on greenside chip and run than did the Americans. St. Louis CC was an old classic course from the early 1900s, and many of the greens lent themselves to chip shots. Most of the Americans defaulted to LW pitch shots, regardless of the situation. (USA won overall, but but there was a USA bias toward pitch shots).