I was playing checkers today with a friend and the weirdest thing happened. I was black and he was red. I had a black piece situated so that there were no possible moves for his red piece, but i could still make a move. It eventually came down to him having two pieces (one that couldn't move and one that could), and me having two pieces. I destroyed his piece that was able to move and his turn came up, but he couldn't make a single move. What has to happen then? Does red have to forfeit? or is it just a tie?