Arrow keys or WASD to move. Beware of the opposing pawn, it can end your run easily. Also, beware of its bishop/knight/rook/queen. They attack wherever they move and the next piece will actually go to a random spot there. You take more damage the closer you are to it. Get your own pawns and especially the rainbow ones. Those let you heal faster and do much more damage. Finally, achieve checkmate by hitting the enemy pawn with yours. It will take some time but you can do it!
I'm literally doing anything at this point