The champion and runner-up were neck and neck, separated by only 0.1 seconds.
Tips
history
From Li Pu's Song-dynasty poem 《中秋》: 平分秋色一轮满,长伴云衢千里明 — 'a full moon evenly divides the autumn view.' The moon at mid-autumn splits the season in half; the image generalized to any equal split.
usage
Neutral to mildly positive — describes genuine equal footing in competition, market share, popularity, or results. Pair with 不分伯仲 or 难分高下.