出其不意，攻其不備 [－－－－－－－－备]

Jyutping ceot1 kei4 bat1 ji3 ， gung1 kei4 bat1 bei6
Pinyin chū qí bù yì ， gōng qí bù bèi

Definitions (Wiktionary)

phrase, idiomatic
Synonym of 攻其無備，出其不意／攻其无备，出其不意 (gōng qí wú bèi, chū qí bù yì, “to catch somebody unprepared; to take somebody by surprise”).
(syn.) 攻其無備, 攻其无备, 出其不意

Jyutping
Pinyin chū qí bù yì , gōng qí bù bèi

Definitions (CC-CEDICT)

to catch an enemy off guard with a surprise attack (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3])