can trap (although it cannot then capture) a knight on the rim (see diagram), especially in the endgame. Stamma's mate In a few rare endgame positions where the opposing king is trapped in a corner in front of its own pawn, it is possible to force mate with only a king and knight in a pattern known as Stamma's mate, which has occasionally been seen in practice. In the position below, from Nogueiras–Gongora, Cuban championship 2001, Black played 75...Nxf6, incorrectly assuming that the ending would be drawn following the capture of the last white pawn on a2. (Correct was 75...Ne3 76.Kg6 Ng4 77.Kg7 and now 77...Nxf6! may be safely played, the king being sufficiently distant). Play continued 76.Nxf6 Ke5 77.Nd7+ Kd4 78.Kf4 Kc3 79.Ke3 Kb2 80.Kd2 Kxa2 81.Kc2 Ka1 82.Nc5 Ka2 83.Nd3 Ka1 84.Nc1 and Black resigned, as 84...a2 85.Nb3 is mate. Notation In algebraic notation, the usual modern way of recording chess games, the letter N stands for the knight (K is reserved for the king); in descriptive chess notation, Kt is sometimes used instead, mainly in older literature. In chess problems and endgame studies, the letter S, standing for Springer, the German name for the piece, is often used (and in some variants of fairy chess, N is used for the nightrider, a popular fairy chess piece). History The knight has the oldest defined movement of any chess piece. It was first introduced in the Indian game of chaturanga around the 6th century; it has not changed since. Variants Pieces similar to the knight are found in almost all games of the chess family. The ma of xiangqi and janggi is slightly more restricted; conceptually, the piece is considered to pass through the adjacent orthogonal point, which must be unoccupied, rather than "jumping". Another related piece is the keima of shogi, which moves like a knight but can move only two squares forward followed by one square sideways, restricting its movement to two possible squares. Names The knight is colloquially sometimes referred to as a "horse", which is also the translation of the piece's name in several languages: Spanish caballo, Italian cavallo, Russian конь, etc. Some languages refer to it as the "jumper", reflecting the knight's ability to move over pieces in its path: Polish skoczek, Danish/Norwegian springer, Swedish springare, German Springer, Luxembourgish Sprénger, Slovene skakač. In Sicilian it is called sceccu, a slang term for a donkey,