Electrical chess game

Claim 1

A chess game apparatus comprising: a chessboard matrix of ranks and files of electrically operable optical display cells; each of said cells being configured to selectively display at least twelve states in the form of symbols generally in the shape of the six types of chessmen of each of two colors in response to a coded digital input signal; board position memory means coupled to said cell matrix and organized for storing and supplying said digital input signal for each cell corresponding to the state of each cell; input and keyboard means coupled to said board position memory means for commanding a desired change of position of said cell matrix by designating the rank and file of any of said cells, the chessmen symbol currently displayed at said designated cell, and the rank and file of the cell to which the symbol at said designated cell is to be moved, said keyboard means comprising: a set of eight rank keys in one to one correspondence with the six types of chessmen symbols; and a set of two color keys in one to one correspondence with said two colors of chessmen; said chess game apparatus further comprising a move memory means fed by said keyboard means for storing a sequence of the last previous changes of position of said cell matrix; said keyboard means including a memory key coupled for enabling transfer of information from said move memory means to said board memory means to enable sequentially undoing moves in response to each actuation of said memory key.