剑走偏锋
jiàn​zǒu​piān​fēng

side stroke

剑走偏锋 (劍走偏鋒) jiàn​zǒu​piān​fēng
side stroke
a sword technique using the edge or side of the blade rather than a direct frontal attack to gain an advantage
unconventional gambit
an unexpected winning move or taking a non-traditional, often risky path to achieve success

Sources
Definitions
CC-CEDICT