grandmaster
🇺🇸
/ˌɡrændˈmæstər/
🇬🇧
/ˌɡrændˈmɑːstə(r)/
A person who is an expert in a particular field, especially chess, and has the highest rank.
The grandmaster made a series of brilliant moves that left his opponent in a difficult position.
グランプリマスターは、相手を困難な状況に追い込む一連の素晴らしい手をしました。