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There are two types of jumps: edge jump and toe jump.
The more knowledgeable fans left the arena thinking they had witnessed the first quadruple toe jump by an American skater.
In his free program, he executed double toe jump three times and lost the credit for one of his triple-jump combinations.
Almost effortlessly she landed seven triple jumps, one more than Chen, including a difficult triple toe jump she adventurously added at the end.
The flip jump is a toe jump that takes off from a back inside edge and lands on the back outside edge of the opposite foot.
Toe jumps are launched by tapping the toe pick of one skate into the ice, and include (in order of difficulty from easiest to hardest):
Kwan then struggled to hold on to her national title after finishing third in the short program and falling on a triple toe jump last month in Cleveland.
Rochette, 23, delighted fans with her sensuous, tango-themed programme which included a solid triple lutz-double toe jump combination followed by a perfectly executed triple flip.
Kozuka landed a quadruple toe jump and included seven triples to earn a total score of 233.51 following his performance to Liszt's Piano Concerto No. 1.
Unwilling to take any big risks, Urmanov left out his trademark quadruple toe jump, which he landed in a fifth-place performance at the 1992 Olympics in Albertville, France.
After Kwan reduced a triple toe jump to a double, and cut a double axel into a single during the long program, Hughes skated onto the ice with a chance to win.
No other figure skater will attempt what Elvis Stojko has planned for his long program: a quadruple toe jump - four revolutions in the air - followed by a triple toe jump.
Two days later, during the free skate, Buttle fell on his attempt at a quad toe jump and then put a hand down on the ice after a triple axel, where he ended up losing to Evgeni Plushenko from Russia.
So Plushenko does what only two other skaters managed on Thursday â a quadruple toe jump â in combination with a triple toe (leaving off a double toe at the end, the three-spot trick his signature move) and scores 14.60.
Eldredge did not do a triple-triple combination jump as planned, and seemed wobbly on two jumps, but he recovered with a strong triple axel late in his program, then replaced a double axel with a more ambitious triple toe jump.
The toe loop jump is a toe jump that takes off from a back outside edge and lands on the same back outside edge (in other words, a toe-pick assisted loop jump, although the mechanics of the two jumps are very different).
Flip Jump: A toe jump in which the skater takes off from the back inside edge of the skating foot with assistance from the toe of the free foot, turns one rotation in the air and lands on the back outside edge of the original free foot.