Yay, I was able to beat it by sacrificing everything at my first game.
About the game itself, well, I like chess so +1 star for that. The art is simple and it goes straight to the point, "classic chess", I like the color choice you made, and I loved the intro in which you place the pieces, another +1. Sound is okay I guess, goes perfect with the art style tho, I appreciate the fact that you didn't include some kind of tune when you're suppossed to be focused, +1. Multiplayer is a nice detail, also... Programming a chess from scratch? +2 for that.
You made me curious about Pico-8, LUA is nice.