Buakaw in MAX: Muay Thai with the clinch taken away
A Lumpinee champion won K-1 MAX twice by discarding roughly half of what makes Muay Thai work, which is the single best demonstration of what the clinch rule costs.
Buakaw Banchamek came to K-1 MAX as a Lumpinee stadium champion and won the tournament in 2004 and 2006. The interesting part is what he had to leave behind to do it.
Muay Thai's clinch is not a pause. It is a scoring position where knees, off-balancing and sweeps accumulate points and wear opponents down, and Thai fighters build entire game plans around reaching it. K-1 rules break the clinch within a second or two, which removes that phase almost completely. Elbows are gone as well.
What Buakaw did was adapt rather than complain. The left round kick stayed, and stayed devastating. The teep stayed. What replaced the clinch was hand volume and forward pressure borrowed from exactly the Dutch style he was fighting against. Watching his MAX run alongside his Thai stadium footage is the clearest available before-and-after of one ruleset change.
The honest conclusion cuts both ways. It shows a Thai fighter could beat the world's best under a non-Thai code, which settles one argument. It also shows how much of Muay Thai simply does not appear under K-1 rules — so the tournament never actually tested Muay Thai against Dutch kickboxing, only the parts of Muay Thai that survive the K-1 rulebook.