[纸上谈兵 / 紙上談兵, zhǐ shàng tán bīngㄓˇ ㄕㄤˋ ㄊㄢˊ ㄅㄧㄥ] lit. military tactics on paper (成语 saw); fig. theoretical discussion that is worse than useless in practice (cf. Zhao Kuo 趙括|赵括 leading an army of 400, 000 to annihilation at Changping in 260 BC); an armchair strategist; idle theorizing, See Also: 成语, 趙括, 赵括#40926