zhǐ
shàng
tán
bīng
1
lit. military tactics on paper (idiom)
2
fig. theoretical discussion that is worse than useless in practice
3
armchair strategist
4
idle theorizing
5
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