joshi tm: "Ultra-weak" means it's known what the result of the game will be (or cannot be) given perfect play by both players. PahTum for instance is ultra-weak solved in the sense that the second player cannot win (strategy stealing argument). But for a game to be solved ultra-weakly, you can prove the result, but you do not have to have a method reaching that result. Weakly solved means that you have a method for one player to force a win (or draw) from the starting position. Strongly solved means that you from any position what the result will be, and how to archieve that result with perfect play from both sides. Chess is partially strongly solved for up to 6 or 7 pieces (that is, for any legal chess position with at most 6 (or 7) pieces, optimal play for both sides is known)