紙上談兵 [ㄓˇ ㄕㄤˋ ㄊㄢˊ ㄅㄧㄥ; zhi3 shang4 tan2 bing1]
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 leading an army of 400,000 to total annihilation at battle of Changping 長平之戰 in 260 BC
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