知己知彼，百戰百勝 [－－－－－－战－胜]

Jyutping zi1 gei2 zi1 bei2 ， baak3 zin3 baak3 sing3
Pinyin zhī jǐ zhī bǐ ， bǎi zhàn bǎi shèng

Definitions (Wiktionary)
  1. proverb
    Know yourself and know the enemy, and you can win every battle you fight.