Dictionary Entry: 纸上谈兵

lit. military tactics on paper (idiom) ꞏ fig. theoretical discussion that is worse than useless in practice ꞏ armchair strategist ꞏ idle theorizing ꞏ cf Zhao Kuo 趙括|赵括[zhào kuò] leading an army of 400,000 to total annihilation at battle of Changping 長平之戰|长平之战[cháng píng zhī zhàn] in 260 BC