Chess on Ice, as some call it, was invented in Scotland more than 500 years ago.
LONDON (CNN) -- Michael Phelps, the most decorated Olympian in history, said Monday that he really means it when he says he is retiring.
"I'm done. I don't know if people really believe me, but I am actually finished. I'm retiring," he told CNN's Becky Anderson.
"D-O-N-E. Done," she pressed.
"Yes -- I'm done," he insisted.
Phelps, the U.S. swimmer, not only shattered the record for the most medals ever won by a single person at the Olympics -- with 22, including 18 golds -- but also made history as the first swimmer to win gold in two different events in three consecutive Olympics.
On Monday, he also defended the gold medal-winning swimmer Ye Shiwen, who has been suspected -- without proof -- of doping after her remarkable victories.
"It's kind of sad that people have a great swim and that's the first thing they say," Phelps said of the Chinese 16-year-old.
"People who work hard -- it shows. There are people who just jump to that conclusion sometimes, and it's not right."
American gold medal gymnast Gabby Douglas was back in action Monday on the uneven bars, but turned in a disappointing performance and came eighth.
Hometown favorite Beth Tweddle took bronze in the event, behind Russia's Aliya Mustafina, who claimed gold, and Kexin He of China, who earned silver.
Another gold medalist found himself at the center of another controversy Monday as Kenyan police confirmed that steeplechase winner Ezekiel Kemboi was under investigation on suspicion of trying to stab a woman on a date before he left for the Games.
The woman accused Kemboi of making sexual advances, said deputy police spokesman Charles Owino, without naming the alleged victim. Kemboi is a policeman himself, according to Owino.
Kemboi said that he was the victim of attempted extortion and that police had not given him a fair hearing, Owino said.
And the International Olympic Committee announced that it disqualified American judoka Nicholas Delpopolo from the men's 73-kg judo event for a doping violation. It stripped the 23-year-old of his seventh-place finish after he tested positive for a cannabis byproduct.
Think you can do it?!
You're out on an icy island, being attacked by hard rubber disks that are frozen before games to make them even harder.
In 2012, Big Al and Cayden McFarland tried their hand at some of the more popular summer game events. Two years later, they're back giving the winter games a go
Tulsan Hans Helmrich has been a sports fan all his life. So you could imagine his excitement when at age 13, he was picked to be a ball-boy for the USA Men's basketball team for the Olympics.
Shots from the top of the key. Shots from behind the backboard. Shots that were bounced off the floor. Ivory Latta of the Tulsa Shock simply couldn't miss!
The 100-meter dash pits the world's eight fastest men together as they race for the title of "World's Fastest Man." That's not something Big Al nor I will be confused with. But it didn't stop us from trying!
The cable ratings for archery were huge and some attribute the sport's rise in popularity to the recent The Hunger Games movie.
The sport of high jump changed forever back in 1968. That's when Dick Fosbury came up with the jump that bears his name - the Fosbury Flop. So, that begs the question, can Big Al and Cayden pull it off?
The backstroke looks like it's a nice leisurely stroke, with the opportunity to possibly catch some rays at the same time. Not quite.
Check out Big Al Jerkens and Cayden McFarland's latest Olympic try: the shot put.