For almost any of the author's ten hardest spare's, for an amateur they are virtually impossible and require a lot of luck.
My real complaint about this article is for the analysis to be correct the results would have to exclude all the times that the bowler maximum pin count over making the spare. Among amateurs, I know some bowlers who have never met a split they didn't try to convert. There are others who who never try to make any thing wider than a baby split. Professionals, because this is how they earn a living, will at some level do a risk/reward analysis as to whether they should go for the conversion or go for count. I would take these conclusions with a grain of salt.
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