written polemics
... 笔友 pen pal 笔战 written polemics 吃熊心豹子胆 to eat bear heart and leopard gall (idiom); to garner one's courage ...
verbal battle
... 笔润 remuneration for writing; pen payment 笔战 verbal battle 编纂 compilation ...
Blackboard
lead wars
Chalk Fighter
通过描写语言文字进行激烈的争辩