Daily Chinese Idiom Guessing Game
To match each other blow for blow; to oppose each other with equal force.
针锋针尖。针尖对针尖。比喻双方在策略、论点及行动方式等方面尖锐对立。
宋·释道原《景德传灯录》卷二夫一切回答，如针锋相投，无纤毫参差。”
During the debate, the candidates were针锋相对 on every issue, neither willing to concede.