YOU SAID:

finn used his castle to get himself in checkmate at the castle

INTO JAPANESE

彼の城を使って城の長老に身を任せる

BACK INTO ENGLISH

I will leave him to the elders of the castle with his castle

INTO JAPANESE

私は彼を城の長老たちに去らせます

BACK INTO ENGLISH

I will let him by the elders of the castle

INTO JAPANESE

私は彼を城の長老たちに

BACK INTO ENGLISH

I will give him the elders of the castle

INTO JAPANESE

私は彼に城の長老たちを與えます

BACK INTO ENGLISH

I will give him the elders of the castle