zhǐ shàng tán bīng
lit. military tactics on paper (idiom)
fig. theoretical discussion that is worse than useless in practice
armchair strategist
idle theorizing
cf Zhao Kuo 趙括|赵括 leading an army of 400,000 to total annihilation at battle of Changping 長平之戰|长平之战 in 260 BC
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