1) Chess variant 
Quatrochess is a chess variant for four players invented by George R. Dekle, Sr. in 1986.{sfnp|Pritchard|1994|pp=244–45|ps=}{sfnp|Pritchard|2007|p=316|ps=} The board comprises 14×14 squares minus the four central squares. Each player controls a standard set of sixteen chess pieces, and additionally nine fairy pieces. The game can be played in p...