"Discovered" check is given when, by moving a piece, another piece is unmasked which attacks the adversary's King.
DRAWN GAME.--Beside the more decided issue of checkmate, there is another possible termination of a game--viz., the "drawn game," or "draw."
A draw ensues: 1. If neither side can give checkmate.
2. If both sides remain with King only, or with a single Bishop, or single Knight only in addition.
3. If both players repeat the same series of moves three times, thereby tacitly admitting that they are { 348} not strong enough to give checkmate, or that they do not intend to venture upon another line of play.
4. If a player under certain specified conditions is unable to give mate in fifty moves.
Black. +---------------------------------------+ | | #K | | | | | | | |---------------------------------------| | | | #P | | | | | | |---------------------------------------| | ^Q | #P | ^B | | | | | | |---------------------------------------| | | ^P | | | | | | | |---------------------------------------| | | | | | | | | | |---------------------------------------| | ^P | | | #B | | | | | |---------------------------------------| | | ^P | | | | | | | |---------------------------------------| | ^K | | #Kt| | | | | | +---------------------------------------+ White.
5. Through "perpetual check"; for instance, if a player, having otherwise a lost game, can save it by constantly forcing the opponent to move his King by repeated checks. In Fig. 5 Black is threatened with checkmate by Q to R 8, or Q to Kt 7. But, { 349} it being Black's move, he would play Kt to Kt 6: ch.; White _must_ play K to R 2; Black returns to his old position again, checking, and as there is nothing to prevent his repeating these two moves _ad infinitum_, the game is drawn.
Black. +---------------------------------------+ | | #K | | | | | | | |---------------------------------------| | | ^P | | | | | | | |---------------------------------------| | | ^K | | | | | | | |---------------------------------------| | | | | | | | | | |---------------------------------------| | | | | | | | | | |---------------------------------------| | | | | | | | | | |---------------------------------------| | | | | | | | | | |---------------------------------------| | | | | | | | | | +---------------------------------------+ White.