More coverage tests for +, -, *
More coverage tests for +, -, *

acenode/gambit,acenode/gambit,jasperla/gambit,BeImprovised/gambit,BeImprovised/gambit,jasperla/gambit,thewhimer/gambit,thewhimer/gambit,BeImprovised/gambit,thewhimer/gambit,jasperla/gambit,BeImprovised/gambit,acenode/gambit,jasperla/gambit,acenode/gambit,thewhimer/gambit,thewhimer/gambit,thewhimer/gambit