不相上下 evenly matched
Explanation
指双方水平相当，难分高下。
Refers to both sides having equal ability, hard to distinguish.
Origin Story
话说南北朝时期，北魏和南梁两国实力相当，多次交兵，胜负难分。北魏名将尔朱荣屡次击败南梁军队，而南梁名将韦睿也多次挫败北魏的进攻。双方将士骁勇善战，不相上下，战争持续了数年，最终两败俱伤，没有决定性的胜利者。尔朱荣和韦睿两位将军，如同棋逢对手，将才盖世，他们的军事才能不相上下，都留下了赫赫战功。
During the Northern and Southern Dynasties, the Northern Wei and Southern Liang dynasties were of comparable strength, engaging in numerous battles with no decisive victor. Northern Wei's renowned general, Erzhu Rong, repeatedly defeated Southern Liang's armies, while Southern Liang's celebrated general, Wei Rui, equally repelled Northern Wei's offensives. Both sides possessed equally skilled warriors; their combat prowess was a match. The war lasted for years, ultimately leaving both sides depleted and without a clear winner. Erzhu Rong and Wei Rui, both exceptional military strategists, possessed comparable skill and made remarkable contributions to their respective histories.
Usage
形容双方实力或水平相当，难以区分优劣。
Describes the comparable strength or level of both sides, difficult to distinguish.
Examples
-
两队实力不相上下，比赛异常激烈。
liǎng duì shí lì bù xiāng shàng xià, bǐsài yí cháng jīliè
The two teams are evenly matched, and the game was very intense.
-
他的书法和绘画不相上下，都达到了很高的水平。
tā de shūfǎ hé huìhuà bù xiāng shàng xià, dōu dá dào le hěn gāo de shuǐpíng
His calligraphy and painting are equally good, both reaching a very high level.