Disclosed is a photochromic golf ball with a one- or multi-piece structure, which comprises a photochromic compound. This allows forward progress to be made through the instruction stream during the stall condition which would otherwise cause the microprocessor or thread of execution to be idle. A cover extending from the body outer surface has a free end with an inward projection, the cover and a rear protrusion of the body lower edge together defining a second groove. A cover can obscure the location of the weight member on the game piece. In triggering conditions, such as during simultaneous control circuit failure and loss of some portion of the electrical output generation device in extreme winds, wind turbine control is accomplished by increasing torque from the electrical output generation device via shorting of windings, so as to cause retardation of blade rotation.