Basically a take on that really old Chesstale AU from back in the day, except it utilizes actual Chess mechanics but with a twist
Each action at the bottom performs something different
> MOVE - you can select a piece to move it
> WAIT - you can just skip your turn
> TRICK - you can trick the other opponent into doing something at random, which is also the way you'd perform the "GENOCIDE" route, by cheating
> QUIT - you can give up against the opponent, but it only works sometimes
You also start out with a little amount of pieces, and get more pieces the more you progress through areas and the story (you only get all pieces on bosses, however)

This is also inspired by UNOTale and also that thing in the Kickstarter where Toriel says you should be playing chess instead