Fight a run of 5 boards, upgrading your surviving army.
How to play
Fight a run of 5 boards against ever stronger black armies. Checkmate the enemy king to win a board: you may not leave your own king in check, and a stalemate is decided by material like a stall. Only your surviving pieces carry over to the next board, so every loss matters (your pawns are topped back up to four), and after each victory you choose one of three upgrades for your army. If a board goes 50 moves with no capture or pawn move, the side with more material wins it (a tie goes to Black). Get checkmated once and the run is over; conquer all five boards to win.