My former (pay and play) club used to keep two holes open on every green, so that the green keepers could easily change the flag position from day to day. It was quite a busy course, so this may have been related to footfall and wear and tear around the green, but I don't really know why. I once holed my second shot on a par-5 into the wrong hole for an unofficial albatross. I then had to place the ball next to this hole and putt to the correct one. I three-putted! Grrrl. 

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