Yuko-datotsu 有効打突

Ippon (n.)

The act of successfully scoring a waza in kendo. The act of striking with ki-ken-tai-no-itchi.
See ki-ken-tai-no-itchi and yuko-datotsu.

Ki-ken-tai-no-itchi (n.)

A term which expresses an important element in moving for offense and defense; it is mainly used in teaching striking moves. Ki is spirit, ken refers to the handling of the shinai, and tai refers to the body movements and posture. When there three elements harmonize and function together with the correct timing, they create the conditions for a valid strike.

Yuko-datotsu (n.)

Making a valid strike. A valid strike which is considered ippon. According to the rules, a waza is complete when the following conditions are met: showing a fullness of spirit and appropriate posture, striking a datotsu-bui (striking zone) of the opponent with the striking region of one’s own shinai while using correct ha-suji, and expressing zan-shin.

If the necessary conditions are met, ippon is also given in the following cases: when ones strikes the opponent as soon as the opponent drops his/her shinai, steps out of court, or falls down, and when one strikes the opponent just as the signal for the end of match is given.

Ippon is not given in the following cases: when both players simultaneously make valid strikes and when one player makes a valid strike but the opponent shows full spirit and proper posture and the tip of his/her shinai is on the front of the chest of the striking player.

A number of years ago now I went to a shiai with my (then) girlfriend and her dad. He was a smart guy: a successful orthodontist who had turned down a teaching job at Harvard years before to look after his then young family. At that time he currently part time lectured at Rutgers in New Jersey while running his own clinic. After watching for an hour or so he said to me, “George, how do you decide whats a point and what isn’t?” After mumbling for a bit I realised that I couldn’t really answer him. I guess that was due to my inexperience at the time, and I still remember the look on his face at my lack of solid explanation. *

After a bit, he frowned and then said to me, “Well, it seems whatever it is that decides a point seems to be understood by those that practise kendo, as they not only fairly acknowledge strikes when they are called (generally unanimously by the judges), but the kendo-experienced spectators (i.e. the majority of people there) tend not to disagree.” Hmmm, I thought.

Although now I can almost certainly rattle of what it is that makes an ippon, there are still elements of it that can only really be appreciated by those that do kendo. People that do kendo know what a good strike feels like (to do and to receive) and they just know good style when they see it. Often this is hard to verbalise. A year or so ago I found a chart that attempted to explain what an ‘ippon’ is. Its definitely accurate and can be used as a great resource to explain to people with less (or even no) experience what constitutes an ippon. However, it cannot of course define those elements that are beyond verbalisation.

At any rate, here is the chart for you to check out (click to enlarge). Have a look and see what you think.

* Needless to say that relationship didn’t go far…

Update: September 2015

A full five years after this post was originally published Andy from All Japan Budogu used this as part of an extended video on the company YouTube channel. Check it out here:



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I'm the founder and chief editor of kenshi247.net. Amongst other things I am a high school kendo club coach, an avid practitioner of classical swordsmanship, a history student, and a vegetarian.

5 thoughts on “Yuko-datotsu 有効打突

  1. Any thoughts on yuko-datotsu in Jodan?

    From the explanation above “when one player makes a valid strike but the opponent shows full spirit and proper posture and the tip of his/her shinai is on the front of the chest of the striking player”

    Obviously a Jodan players shinai cannot touch the opponents chest as the opponent attacks. I have always understood that if a jodan player remains indominable and maintains a constant awareness such attacks can be ignored? but the question niggles in the back of my mind…why the attack wasn’t recognised and pre-empted by the Jodan player… the only answers I can think to this are 1) the Jodan player was fast asleep, or 2) his mental focus was so strong he disregarded it.

    But then I’m reminded by other kendoka, what is written above… namely that if the strike is on target (lets say kote to a jodan player) and the aggressor finishes with all the other elements of yuko-datotsu is this a point?

    At a superficial level (my level 😉 ) I think if the jodan player remains motionless and forward focused it is not a point, but if the jodan player flinches or unconsciously reacts its almost certainly a point.

    Whatcha reckon?

  2. Robin, good question!

    Note that I mention that there are “elements that are beyond verbalisation” at the end there… I think you are talking about one of them. What is given by an “ippon” in a shiai is (meant to be) objective based on the decision of three shinpan. A “real ippon” – I posit – can only be decided mutually between the two kenshi involved. Whats shown in the diagram above, and what is defined by the ZNKR, is simply a guide. There might even be times when you feel that you have lost to a strike that didn’t actually hit you accurately…. (just as there are times you are struck accurately and with all the elements listed above yet it doesn’t “feel right”).

    At the end of the day, a lot of this is based on experience, attitude, and where you are going with – even why you are doing – kendo. I’ll leave it there. Hope it makes sense.

  3. This chart is part of the Shinpan Tebiki which Robert Stroud sensei has recently translated into English: http://bit.ly/cPi2KP

    I think it’s interesting because it adds to the “requisites” (which have always been the definition of yuko datotsu according to Article 12 of the Regulations), the “components” which shinpan and shiaisha alike have known were also necessary but which remained “unwritten”.

    At International Shinpan Seminars, if you were questioned on “Why didn’t you award that degote?”, you weren’t allowed to answer, “Errr, it wasn’t hard enough”, or “it didn’t seem very crisp”, because the Hanshi in charge would say, “Where does it say in Article 12 that it has to be ‘crisp”? Answer only according to what is in the Regulations!” Personally I’m glad they’ve clarified some of these things (although they still do not appear in ‘The Regulations’). Like Slartibartfast I prefer ‘rigidly defined areas of doubt and uncertainty.’ b

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