I pulled this excerpt from a Jeff Brauer piece on Golfdom. It suggests to me that narrow deep greens would be the best way to challenge good players while giving higher handicap players a chance. It also suggests that wide shallow greens would exacerbate the difference between a good and poor player.
"In fact, good players miss wide more often than short or long. Dave Pelz, in his excellent book, "The Short Game Bible" graphed approach shot dispersion patterns for tour players and it resembled a "bra strap." (I'll give you a moment to fixate on that image) with concentrations of missed approaches left and right of the hole, but great with distance control, because they usually make pure ball contact, and get lots of spin.
He found that Tour pros miss, on average, by 7% either side of the target. On 200 yard shots, left to right dispersion is about 28 yards. On 100 yard shots, it's 14 yards. Shallow greens work great high approach shots players, even when approaching with long irons.
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For average players, it's a completely different story! Because they don't hit as high, get as much backspin, or make consistently clean contact, long and short misses are common. They need greater green depth.
According to the USGA Slope Rating Guide, greens must be about 50% deeper than wide for 2/3's of 20-handicappers hold a shot. At 100 yards, golfers need a green about 14 wide by 21 yards deep. At 200 yards, they need 27 yards wide and 40 yards deep to hold a shot. As you see, the green needs the same width as for the good players, but must be much longer, especially at 200 yards!"
http://www.cybergolf.com/golf_news/now_for_our_first_questionWhat courses fit the narrow, deep suggestion best? Which ones are more of the wide, shallow variety? Are the narrow deep ones better in your experience?
I really liked the greens on Ballybunion Old and it seems they fit this description pretty well.