Two distinct xiè uses to remember. As a surname,
解 is uncommon but real — never read a person named
解 as jiě. As a noun, xiè only survives in
解数 (a martial-arts move; by extension, every skill one has), almost always inside the idiom
浑身解数 ('every trick at one's disposal'). The 'acrobatic display' sense is archaic; you won't meet it outside historical texts.