A fluoroaryl magnesium derivative expressed by General Formula : . A heating member is arranged in each of the number of input keys connected to voltage pin of the circuit board via a heating switch. The magnetization of the magneto-optic active medium is modulated thereby causing a variation in the Faraday effect on optical signals passing through the magneto-optic medium. Each footpad defines a footpath comprising a forwardrearward component, an upwarddownward component and an inwardoutward component. The first retention member is a protrusion or a dovetail shaped recess, and the second retention member is a rest of the protrusion or the dovetail shaped recess. A first randomizer determines the number of playing stations a player’s game piece moves, and a second randomizer determines the total number of one-quarter turns of the rotatable gate members.