Queen (chess) to the announcement of "check". Some published rules even required this announcement before the queen could be legally captured. This custom was largely abandoned in the 19th century. In Russia for a long time the queen could also move like a knight; some players disapproved of this ability to "gallop like the horse" (knight). The book "A History of Chess" by H.J.R. Murray, page 384, says that William Coxe who was in Russia in 1772 saw chess played with the queen also moving like a knight. Such an augmented queen piece is now known as the fairy chess piece "amazon".
Pocket Mutation Chess Pocket Mutation Chess Pocket Mutation Chess is a chess variant invented by Mike Nelson in 2003. In this game a player can take a piece from the board and put it into a "pocket". The piece in the pocket can be put back on the board later. When placing the piece into the pocket the player can "mutate" the piece, i.e. change it to a different piece. The game is one of the "Recognized Chess Variants" at "The Chess Variant Pages". The starting position in this game is the same as in standard chess. Players make moves as in standard