Chess has just two players; the game might finish in a win, a loss, or a tie. A player wins when his opponent resigns or when he checkmates his opponent's king, which necessitates assaulting the king. That is why, even with the pawn's unique movements, it is impossible to capture a king. However, if the king is exposed while unprotected, then it can be captured directly. This is called "king-hunting". King safety is one of the most important factors in determining how a game will end. If the king is attacked and doesn't get away soon enough, it will be checkmated. Conversely, if it manages to hide from its enemies, then it can escape back into battle. However, if it is not protected by any pieces, then it is easy prey for the first enemy attack. The king must therefore be guarded at all times, especially during attacks. A pawn cannot attack nor defend itself, but it can give support to other troops. Therefore, a pawn fleetly advances along the board, seeking out enemy units and destroying them. Once it has helped defeat several opponents, it becomes eligible to join another unit on the battlefield. Pawns are very useful troops to have on your side because they don't cost anything to use and they can help destroy enemy units that may be threatening you with an attack. However, beware: once a pawn joins a combat group, it cannot be removed until the battle is over.