Cháng suǒ 长锁 (trad. 長鎖)

9 strikes of the same string: Index closing, index opening, middle closing, middle opening, index closing, index opening, middle opening, index closing, index opening (Mǒ, Tiāo, Gōu, Tī, Mǒ, Tiāo, Tī, Mǒ, Tiāo). The rhythm is 4 1/8th notes, 4 1/16th notes, then 1 1/8th note.

Part of the Suo yin category of 9 techniques Ferguson mentions where multiple fingers strike the same string in a specific rhythmic pattern.