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.