Kuchar made an 11-foot birdie putt off the back fringe at No. 2 before a bogey on the next hole when he took two shots from a greenside bunker.
Edward Stimpson, a Massachusetts amateur champion, devised the first Stimpmeter in 1935, after watching Gene Sarazen putt off a green at that year's U.S. Open at Oakmont and deciding it was unfair.
WSJ: Ta-Da! The USGA Gives the Stimpmeter a Makeover | Golf Journal by John Paul Newport
Vicar's son Willett had threatened to spring an upset when he sank a 50-foot eagle putt from off the green at the long 14th to go into the joint lead.
Hunter Mahan's tee shot on the 15th hole got stuck high up in a tree, leading to double bogey, but then he rolled in an eagle putt from off the 16th green.
Wales went top of the leaderboard when Dredge sank a 25-foot eagle putt from just off the 15th green.
Ben Curtis had a 40ft putt then it blows 15ft off the green into the rough.
After McGrane had holed for a bogey, Hamill was left with a ten-footer to prolong the play-off but the putt slid by leaving Harrington with the 20, 000 Euro first prize.
He had another chance from 12 feet at the first play-off hole but the putt slipped past the left edge of the hole.
On the 10th hole, somebody might hit a putt ... a foot from the hole, and that same, exact putt 10 minutes later might blow off the green 30 yards and make triple (bogey).
As he got ready to hit his putt, it moved again, this time off the green and down the slope.
Woods conjured up a superb shot from off the green and holed the putt for a bogey five to avoid going over par for the day.
Last year at Crans-sur-Sierre he led by four shots going into the final round but missed a short putt for victory and lost in a play-off to Frenchman Jean-Francois Lucquin.
Thomas Bjorn was left kicking himself after missing from five feet on the 18th - a putt which would have put him in the play-off too.
Runner-up Reid, the Tour's leading rookie, had the chance to force a play-off but missed a five-foot birdie putt at the last as she carded a 73.
Then, on the 17th, Lewis hit into the bunker off the tee and missed a long par putt to card her second bogey of the back nine.
American Kevin Na could have made it a three-way tie-off, but missed an eight foot birdie putt on the last and finished third on 271 while former USPGA champion David Toms and James Nitties were tied for fourth another stroke away.
Jason Day was 6 under with two holes left, but he missed a birdie putt by inches on 17, and was in the sand off the tee on 18.
But Couples became unglued on the seventh hole, when he sent his approach shot over the back of the green, chipped off the front side, then watched an uphill putt slide up and then back down.
Even in the play-off at the Open I did, when I missed a putt to go three shots up on the 17th green.
Only four off the lead after two rounds, Montgomerie followed a three-putt bogey on the long second by going in the water at the next and dropping two more strokes.
Maybin is looking for his first European Tour victory, after missing an eight-foot putt to take the South African Open five months ago before losing the play-off to Richard Sterne.
Byrd's round was his best of the year, and he capped it off with a string of birdies that began with a 25-foot birdie putt on the par-three sixth green and ended with a wedge to six feet of the pin on eight.
"I should have knocked that putt in 99 times out of 100, " said Furyk, also beaten in a play-off in this event, who has now finished second three times on the tour this season.
Chappell, coming off a 10-foot par save on the 16th hole, made a 20-foot birdie putt on the 17th to get within two shots.
The Indian signed off his round of eight-under 63 on Saturday by rolling in a 40-foot eagle putt on the ninth, his 18th hole, to move to 15 under par.
This felt more like work than a working vacation, and the 40 mph gusts became too much when Carl Pettersson lagged a 40-foot putt that was slowing around the hole until a gust came up and blew it another 30 feet and just off the green.
Woods hit a fairway metal off the pine needles and into a bunker, blasted out to 10 feet and rolled in the birdie putt to briefly take the lead.
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