Toshiro Daigo's book Kodokan Judo Throwing Techniques published by Kodanasha International, Tokyo 2005 lists 67 throwing techniques. As Daigo is the chief instructor at the Kodokan, I took this as the authoritative source on throw classification. The Kodokan website now lists 68 throwing techniques. The changes appear to be:

  • +Obi-tori-gaeshi was added
  • -daki age was removed
  • +kouchi makikomi was added

This is the first change I am aware of in my lifetime. Out of curiosity, what prompted this set of changes?

  • It could be worth mentioning that there was a change (additions) in Ne-waza (specifically Katame-waza) as well in the question. – Philip Klöcking Sep 1 '18 at 14:08

As of when, this can be found here: April 1st, 2017 (and it's not been an April's fool!):

The Kodokan has used official technique names consisting of 67 Nage-waza and 29 Katame-waza in the past.

After giving further consideration, two techniques of Nage-waza, Obi-tori-gaeshi (Te-waza) and Kouchi-maki-komi (Yoko-sutemi-waza), and three Osaekomi techniques of Katame-waza, Ushiro-kesa-gatame, Uki-gatame and Ura-gatame were added to the existing official technique names as of April 1, 2017. One technique, Daki-age (Koshi-waza) was deleted from Nage-waza.

Accordingly, 100 technique names consisting of 68 Nage-waza and 32 Katame-waza are recognized as official technique names.

As of why, there is not much more to be found than the opaque "considerations" mentioned in the news itself.

Addendum: This reddit thread discusses (and I think rightfully so) at least regarding Obi-tori-gaeshi and Ko-uchi-maki-komi that it is basically the recognition of distinct techniques successful in sports Judo (Obi-tori-gaeshi is basically a Khabarelli) as such.

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