The system of K-1 changes from time to time as a response to growing popularity in different parts of the world.
In the beginning, the K-1 series was a single tournament in Japan with fighters participating by invitation. K-1 has now branched out to all parts of the world and has been divided into preliminary Grand Prix-s, Fighting Networks and qualifiers. There are six regional GPs on all continents (except Africa and Antarctica) and all of them have the exclusive right to send the winners to the Final Elimination. Preliminaries are organized in countries with minor attendance and consists of tournaments where the winners qualify to the regional GPs.
K-1 attempted to gain popularity in the United States by holding two GPs, however only a few Americans have ever qualified for the Finals. In 2006 one of the American GPs was relocated to Auckland, New Zealand. Additionally the K-1 Paris GP lost its qualifying right in favor of Amsterdam.
The Final Elimination is an event where 16 participants compete for the final eight spots in the Finals. The line-up is made up of 6 new GP winners, the eight finalists from the previous year's Final, plus 2 fighters selected by the K-1 organization. In 2006 there were some minor modifications because Peter Aerts was replaced by Glaube Feitosa who reached the final match, therefore he was included in the 2006 Final Elimination.
Usually the combatants of the Elimination 16-men 8-match super fights are paired by drawing. This is done differently at the Tokyo Dome, however. The event is combined with a ceremony where the fighters pull a ball from a glass bowl with a number on it. The balls are marked with numbers 1 through 8, determining fighter order. The fighter with the number 1 ball will choose first "empty" section. This procedure goes on until all the fighters have selected their first quarterfinal opponent.
In 2007 the K-1 organization introduced two new title belts and restructured the qualification system. The two titles can be acquired through single fights. One was created for the heavyweights under 100 kg fighters and the other for the super-heavyweights. Meanwhile, the well-known 8-man tournament system remains and the GP titles are still handed out.
The new tournament qualification system will be: the 8 finalists of last year, 4 new Grand Prix winners and two new single title champions; if some of the fighters hold more than one title, then the extra ones will be chosen by the organization. The last two spots will be selected by K-1 and the votes of fans from around the world.".[13]
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The principal objective of K-1 is to win either by a knockout or by a split or unanimous decision. Victories are usually achieved by kicks to the legs, head or midsection or using traditional boxing punches, such as the jabs, hooks or uppercuts.
The classic defensive boxing stance is rather ineffective against leg kicks, and fighters are more or less forced to constantly move and counterattack. The traditional clinch, often used in boxing, is not allowed, which has led to a very high knockout ratio in the K-1, since the fighters in other stand-up fighting sports often use the clinch to gain time to recover if they have been hit. The traditional Muai-Thai clinch (two hands grabbing the back of the opponents neck or head) is not allowed in K-1 rules. However, a single handed Muai-Thai clinch is allowed. If a fighter grabs an opponent with the intent of using a knee-technique he must let go after one single blow. In Thai Boxing, the fighters often hold on to each other to continuously use their knees and elbows. The same is said for Karate and Tae Kwon Do, though they consider clinch knees and elbows more circumstantial and only when the opponent is weakened to avoid neck and groin counters.
The rules themselves are constantly adapting and changing to create a competition which allows for participants of different styles to fight in a fairer manner, although these rules accommodate kickboxing rules as the main basis.
In K-1 single elimination tournament matches: