Could you understand that point?

Ryou is my best friend.

We are planning to host a cocktail party this weekend.

Yui is my best friend.

He taught me how to tie a tie.

He utilized his project management skills to start a new business.

He is good at winning in mahjong.

He achieved a win in mahjong with astonishing skill.

He declared a win in mahjong.

Yuki is my best friend.