ELECTRONIC CHESS BOARD AND METHOD OF ITS OPERATION Russian patent published in 2017 - IPC A63F3/02 

FIELD: games.

SUBSTANCE: electronic chess board consists of a chess board, a transmission coil distributed throughout the playing field which has an electromagnetic coupling with receiving coils located under each of the playing fields of the chess board connected to multichannel analogue switch and then to the amplifying stage, an amplitude detector, a generator, an analogue-digital converter and microcomputer having a two-way communication with a communication unit with external computer. Inside each chess piece there is an oscillatory circuit on a ferrite core. The chess board communication unit can be wired, and communication with external computer can be carried out using a communication link. The communication unit can also wire communicating with external computer using a radio access channel of multiple access. The method of electronic chess board operation is characterized by that the transmitting coil emits electromagnetic oscillations of one of the frequencies, the total number of which is determined by the number of types of game pieces. The receiving coils that are a part of oscillating circuit also generate vibrations, the receiving coils are connected to a multi-channel analogue switch controlled by a microcomputer program, the commutator operates in such a way that only one of receiving coils is connected to amplitude detector input at each moment of time, the remaining receiver coils are short circuited. The resonant frequencies of the circuits arranged in the chess pieces and the scanning frequencies emitted by the transmitting coil are selected in so that in the field of receiving coil of the corresponding oscillatory circuit of the piece containing said oscillating circuit, an induction balance occurs resulting in sharp reduction of oscillations amplitude in the receiving coil; at the output of amplitude detector, the signal represents a level of constant voltage and is converted into digital form in analogue-digital converter, then signal is sent to microcomputer, where the field state is determined: type or absence of the chess piece on the given field corresponding to the receiving coil connected at the given moment. The signal parameters are analyzed, the procedure is repeated for each of the receiving coils at each frequency, after recognition of all the coils, information on status of fields is transmitted to the communication unit and then to the external computer. The total number of frequencies of electromagnetic oscillations emitted by the transmitting coil can be twelve.

EFFECT: increased reliability when determining position of chess pieces, especially such pieces that are on the edges or boundaries of the playing fields, increased speed for determining the position of chess pieces and reduced technical delay and, thereby improved the quality of chess play, especially blitz tournaments.

6 cl, 2 dwg