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For throws, I use Toshiro Daigo's book Kodokan Judo Throwing Techniques published by Kodanasha International, Tokyo 2005. It specifically addresses some of the arcane points of Kodokan classification that distinguish what is considered one throw versus another. This book is mostly up to date. Is there a similar canonical resource that covers mat (pins, chokes, armlocks) techniques? For example, I was just informed that ude garami can be done against a straight arm. I previously would have called that an ude hishigi ude gatame.

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Of the materials published by the Kodokan, the two which describe the classification of Katame-waza in most detail are:

Both works demonstrate and list the points of distinction of each technique and their common variations. The video series demonstrates the straight arm variant of ude-garami. While Kano's book includes examples of three variations of ude-garami, it unfortunately does not include the straight arm variant.

Note however that Kano doesn't claim that the examples in this text are exhaustive, making the following caveat:

The katame waza introduced here are the ones most frequently used in randori and competition.


History of Kodokan Katame-waza classification:

01/02/1985: Adds classifications for
     • Sode-guruma-jime, Kata-te-jime, Ryo-te-jime, Tsukkomi-jime, Sankaku-jime
     • Ude-hishigi-ashi-gatame, Ude-hishigi-te-gatame, Ude-hishigi-sankaku-gatame
01/04/1997: Renames hon-kesa-gatame to kesa-gatame
01/04/2017: Adds classifications Ushiro-kesa-gatame, Uki-gatame, Ura-gatame

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    Canon of Judo is a good example of the messiness of technique identification. The technique called body armlock (ude-hisihigi-tai-gatame) on page 151 is currently called ude-hisihigi-waki-gatame in most places. I do not expect resources to agree always. – mattm Jun 4 at 11:46
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    More frustration on the classification of ude garami versus ude gatame: Techniques of Judo by Shinzo Takagaki and Harold (Hal) Sharp shows the ude garami arm configuration against a straight arm as ude gatame, not ude garami. Also amusing is that Hal Sharp appears to have posted the YouTube Kodokan Katame Waza video. – mattm Jul 8 at 19:51
  • @mattm even Neil Adams refers to armbar ude-garami as an ude-gatame: Grand Prix Zagreb 2017 | 78kg | Hamada vs. Camara – ukemi Sep 13 at 13:23

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