3 sentences

1. 我从不公平竞争。

   wǒ cóng bù gōng​píng jìng​zhēng.

   I never fight fair.

   Source: OpenSubtitles

2. 我们必须坚持公平竞争的原则。

   wǒ​men bì​xū jiān​chí gōng​píng jìng​zhēng de yuán​zé.

   We must adhere to the principle of fair competition.

   Source: Dong Chinese Dictionary

3. 我们要本着公平竞争的原则进行比赛。

   wǒ​men yào běn​zhe gōng​píng jìng​zhēng de yuán​zé jìn​xíng bǐ​sài.

   We should conduct the competition based on the principle of fair play.

   Source: Dong Chinese Dictionary