It also appears as a Special Move exclusive to players' Avatars in Street Fighter 6 as a part the "Knock Out Festival" scenario in World Tour mode. They can learn it from Andy Bogard when he appears in Aokigahara.
Input
Zan-ei Ken
+ or ( OK, KOF XIII onwards) (Most appearances)
+ (FF1)
+ or (FFS)
+ ( OK) (SF6)
+ or ( OK) (COTW)
├►
Shippuu Yokoken/Gadankou
+ or during Zan-ei Ken
├►
Kyoukyuu
+ during / Zan-ei Ken
└►
Sokuhou
+ during / Zan-ei Ken
Description[]
"A hard strike that charges the opponent down. Handy when you want to rush in and dish out the pain. Follow up the heavy and REV versions in various ways. You can brake while travelling.*"
—Fatal Fury: City of the Wolves
The user rapidly glides forward with high-speed to drive their front elbow into their opponent, knocking them back on contact.
Upon connecting, depending on the title, Andy is able to follow-up with an extra attack;
Attack
Description
Shippuu Yokoken (疾風横拳; Gale Side-Fist)
Andy thrusts both of his fists into his opponent, blasting them away. Available in the RBFF sub-series & KOF 2000 - 2002 UM.
Gadankou (我弾幸; Self-Bullet Fortune)
Andy does a modified Tetsuzankou that blasts the opponent back. Available in KOF '96 - '99
Kyoukyuu (胸穿; Chest Piercer)
"Follow-up technique performed via additional input during [Zan'ei Ken]. A quick palm strike."
—Fatal Fury: City of the Wolves Andy thrusts his rear palm into his opponent's chest, blasting them away. Exclusive to COTW.
Sokuhou (足崩; Foot Crusher)
"Follow-up technique performed via additional input during [Zan'ei Ken]. A quick leg sweep."
—Fatal Fury: City of the Wolves Andy crouches down and performs a low spinning sweep kick with his rear leg, tripping the opponent. Exclusive to COTW.
The version introduced in KOF XIII not only does more damage, but travels faster and farther, and can cause a wall-splat when used near the corner.*
As well as having the above follow-ups in COTW, Andy can brake his version of Zan-ei Ken by inputting while he glides forward.
The SF6 incarnation of the move interestingly shares an input with the one from the International versions of the original Fatal Fury, rather than the traditional .