Checkers is a popular game in many parts of the world for many years, early forms of the game dates back to 3000 BC. This game is played on an 8 x 8 checkerboard by two players. Each player has 12 pieces placed on the dark squares of the 3 rows on his side. The players take turn to move his pieces. At the start the pieces can only move forwards. Each time a piece can be moved one step diagonally to an empty square, or jump over an opponent piece that is one step diagonally and land on the empty square behind. The jumped over opponent piece is captured and removed from the board. The capturing piece can move again immediately to capture other pieces if possible by making consecutive jumps. Note that during a player's turn, if there are opponent pieces that can be captured, the player must move to capture a piece. Use this rule wisely to force your opponent to make undesirable moves. When a piece reaches the last row, it will turn to a king and gain the ability to move backwards. You win if you can capture all your opponent's pieces, or if your opponent cannot move any of his pieces. The game is drawn if either the same position is reached for 3 times; or if no kings are created and no pieces are captured for 40 moves. The larger the number of pieces you have after winning, the higher your rank.