This is similar to a discussion we had a couple of months ago.

The part of the Decision I'm addressing is....

"In stroke play, in addition to the stroke-and-distance penalty incurred when he proceeded under the lost ball Rule (Rule 27-1), he incurs a penalty of two strokes under Rule 18 and an additional two-stroke penalty for a breach of Rule 15-2."

I think Ron that you are right and there is a R.20-7 penalty where the applicable rule is R.18. R.15-2 also needs an applicable rule and again I think it is R.18 although I know some contributers are of the opinion that it is R.13.