"Wolf and Sheep" is a simple variant of chess that's useful for teaching basic pawn strategies and how to plan several moves ahead. (Well, there are a few different variants with that name, but I'm referring to a specific one.)

White begins with only its 8 pawns. Black begins with only its queen. All pieces move normally. White wins if it gets a pawn to the 8th rank or captures black's queen. Black wins if it captures all the pawns.

Resolves to YES if it's a forced win for white, NO if it's a forced win for black, 50% if it's a draw.