The two finalists are evenly matched — the outcome is hard to predict.
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From Cao Pi's 《典论·论文》 (3rd c.): '傅毅之于班固,伯仲之间耳' — Fu Yi versus Ban Gu are like elder brother and second brother, hard to rank. 伯 = oldest brother, 仲 = second; 'between them' means basically tied.