This is an unexpected decision, which dooms Black to a careful defense without counterplay, where Black fails in the long run.

意外的决定，注定黑棋必须仔细防御而无反攻，下下去黑棋会输棋。

Gunner is a player on kickoffs and punts who specializes in running down the field very quickly in an attempt to tackle the kick returner or the punt returner.

枪手是在开快速跑向场拦截开反攻员的员。