What happens if three pieces are left in chess?

Answer 1

You would keep on playing until one side checkmates, one side resigns, there is an insufficient amount of material to checkmate, one side is stalemated, fifty moves pass without a pawn move or capture, or the same position occurs 3 times. Note that checkmating or a resignation by the opponent are the only ways to win, anything else is a draw. Additional rules can apply in an official tournament but these are the basics.