is a judo

Judo

is a modern martial art and combat sport created in Japan in 1882 by Jigoro Kano. Its most prominent feature is its competitive element, where the object is to either throw or takedown one's opponent to the ground, immobilize or otherwise subdue one's opponent with a grappling maneuver, or force an...

 throw that falls within the seventeen techniques of the Shimmeisho no waza, officially recognised by the Kodokan

Kodokan

, or the Kodokan Institute, is the headquarters of the worldwide judo community. Literally, kō means "to lecture" or "to spread information," dō means "the way," and kan is "a public building or hall," together translating roughly as "a place for the study or promotion of the way." The Kodokan was...

 in 1982.

Literally translated as "Swallow Counter", Tsubame gaeshi is the countering of an ashi waza with Deashi harai

Deashi Harai

, more accurately romanized: Deashibarai, is one of the original 40 throws of Judo as developed by Jigoro Kano. It belongs to the first group, Dai-Ikkyo, of the traditional throwing list, Gokyo-no-Nagewaza, of Kodokan Judo...

from the opposite leg. A right-handed Deashi-harai executed by uke (martial arts), for instance, would be avoided by tori (martial arts)

Tori (martial arts)

is a term used in Japanese martial arts to refer to the executor of a technique in partnered practice. The term "tori" comes from the verb , meaning "to take", "to pick up", or "to choose"....

 bending his right knee, followed by a left-handed Deashi-harai.

Tsubame gaeshi as a counter against uke's Deashi harai is the opening move of the Kaeshi-no-kata

Kaeshi-no-kata

The Kaeshi no kata is a judo kata that, like the Go no sen no kata, focuses on counter-attacks to throwing techniques. It is an older form than Go no sen no kata, and was passed onto Masutaro Otani from Yukio Tani...

. As a counter against Okuriashi harai

Okuriashi Harai

is one of the original 40 throws of Judo as developed by Kano Jigoro. It belongs to the second group of the traditional throwing list in the Gokyo no waza of the Kodokan Judo. It is also part of the current 67 Throws of Kodokan Judo...

, it forms the sixth technique of the Nage-Waza-Ura-no-kata

Nage-Waza-Ura-no-kata

The Nage ura no kata is a judo kata that, like the Go no sen no kata and Kaeshi no kata, focuses on counter-attacks to throwing techniques. It was developed by Kyuzo Mifune, and is not an officially recognized Kodokan kata.-Techniques:...

.