Q: How can I see all my past games against a particular player?

A: You can access the player's profile/stats page and if you played any games against that player before, there will be a "Past games against …" line near the top of the page. Clicking on "Past games" part will take you to the page that lists all your past games against that particular player.

Alternatively, you can access your win/loss/draw table and then click on the number in the "Games" column to access the list of your past games against that particular player.