A war, a game. A game, a war. They call it chess.

King Sombra is a newlywed, and now, with a queen by his side, he must become the strongest. So, he'll start by fighting with a Goddess herself- Celestia.

(For less confusion)

White
King: Celestia
Queen: Luna
Bishop(s): Twilight Sparkle, Mi Amoure Cadenza
Knight(s): Shining Armour, Flash Sentry
Rook(s): Zecora, Discord
Pawn(s): Rarity, Rainbow Dash, Applejack, Pinkie Pie, Fluttershy, Sunset Shimmer, Spike

Black

King: King Sombra
Queen: Queen Chrysalis
Bishop(s): Trixie (The Great and Powerful), Rover
Knight(s): Tirek, Fido
Rook(s): Ahuizotl, Spot
Pawn(s): Changeling(s)