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Cheshire Cat Chess

This variant is played on a 10×10 board with two extra sets of rooks and pawns for each player.
All normal chess rules apply, except: "Whenever a piece moves from its square, then that particular square must at once completely disappear out of the chessboard!"

Parton suggests using checker pieces to mark "disappeared" squares. Once vanished, a square may not be occupied again; however, pieces may move through disappeared square(s), including giving check through them.

Since castling is impossible in Cheshire Cat Chess (pieces which normally clear a path for castling cause needed squares to "disappear"), Parton permits the kings to be moved like queens once per game, on their first move.


https://en.wikipedia.org/wiki/V._R._Parton#Cheshire_Cat_Chess
Chess clock by Gizmo: https://steamproxy.net/sharedfiles/filedetails/?id=1541793481