If a position is repeated three times, the game is over as a draw.
If the king is not in check, but the player can make no moves, the game is over as a draw. This is also known as stalemate.
If there are only two kings, or just a bishop and a king vs. a king, or a knight and a king vs. a king remaining on the board, the game is over as a draw, since there is no way for those situations for a king to be checkmated.
Pawns can be promoted. If a pawn reaches the other side of the board(rank 8 for white, rank 1 for black), then it can get promoted to a queen, a rook, a knight, or a bishop.
Some people have pieces worth a certain point value.
Pawns = 1 point
Knights = 3 points
Bishops = 3 points
Rooks = 5 points
Queens = 9 points
Kings = Priceless. However - some people score it as 3 1/2 points.
Wacky Chess scores it as 4 points.
Wacky Chess keeps track of the total points on the board as a convinence for comparison purposes.