Cool! It is a great way to show people how to read greens. The notion that great putters treat all putts as though they are flat and straight has been around for a while. Geoff Mangum's book Optimal Putting helped me in this regard. So a 10 foot up hill putts plays like a "flat" 12 footer. And of course every putts is "straight" in that the intention is to start it on a straight line and let mother nature move it where she wills!
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