Perpetual check

This typically arises when the player who is checking feels their position in the game is inferior, they cannot deliver checkmate, and wish to force a draw.

For example, giving perpetual check is not allowed in shogi and xiangqi, where doing so leads to an automatic loss for the giver.

In this diagram, Black is ahead a rook, a bishop, and a pawn, which would normally be a decisive material advantage.

In the game Peter Leko–Vladimir Kramnik, Corus 2008, Black was able to obtain a draw because of perpetual check:[5] If 28.Kd2?

[9] Noam Elkies devised a mutual discovered perpetual check position that requires only one fairy piece in 1999.

[10] Xiangqi and janggi, due to the presence of their cannon pieces, can also have mutual perpetual check.

The result is similar, in that the opposing side's attack stalls because of the need to respond to the continuous threats.

An example of perpetual pursuit being used in a game occurred in István Bilek–Harry Schüssler, Poutiainen Memorial 1978.

[17] It has since been removed because perpetual check will eventually allow a draw claim by either threefold repetition or the fifty-move rule.