紙上談兵 (zi2 soeng6 taam4 bing1, 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[Zhao4 Kuo4] leading an army of 400,000 to total annihilation at battle of Changping 長平之戰|长平之战[Chang2 ping2 zhi1 Zhan4] in 260 BC
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