A first directory server computer system subscribes to update data published by directory servers via an advanced message queuing protocol server. Initially, a first and second contract is received utilizing a network. Depending on their categories, outcomes influence the auxiliary game in different ways. Then, a tilt angle of at least one of the compression plates tilted to an end plane of the spring is provided, in at least one direction on a plane including a coil axis of the spring, on the basis of the error between the target reaction force axis and the detected reaction force axis. The first pin is moveable in the first slot between a first position, in which the first pin engages the second track and cants in a first direction, and a second position, in which the first pin disengages the second track.