纸 zhi3 紙
上 shang4 上
谈 tan2 談
兵 bing1 兵
  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[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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