Again.

Summary: Celestia and Luna are playing a chess game, both deeply inmersed in the game. I especially remember there being a link in the description which led you to a replay of the game the two sisters played, so you could read and watch the game at the same time.

I don't have much more info. Hopefully you can help me, and I can finally be freed of the torture that is losing a story I badly want to read.

5819385 Knew what it was right away. :)

I believe you're looking for 'Strategic', by Winston.

5819432 It is, thank you!

5819464 No prob!

5819385 You should really consider adding more stories to your 'read it later' folder