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Frisian draughts

• 10×10 board, each player has 20 men on the dark squares of the four nearest rows. White moves first.

• A man moves one square diagonally forward. It captures in all directions: diagonally forwards and backwards, and in a straight line — forwards, backwards and sideways. In a straight line the next dark square is two squares away: the man jumps over the piece standing there and lands on the next dark square.

• A king moves diagonally any distance. It captures from a distance both diagonally and in a straight line, and may land on any free square behind the captured piece.

• A man becomes a king only if it ends its move on the last row. If a capture passes through the last row and goes on, the man stays a man.

• Capturing is mandatory and a capture must be carried through to the end. Captured pieces are removed after the whole move; a piece cannot be jumped twice.

• You must take the most valuable capture: a king is worth more than a man but less than two men (three kings are worth more than five men but less than six). If values are equal, the king must capture.

• While a player still has men, the same king may not make more than three moves in a row without capturing: the next move must be made with another piece.

• A missed capture does not cost a piece: the server simply will not accept such a move.

• A player with no legal move loses. Draw: two kings against one — the stronger side has 7 moves to win; a king against a king when the player to move cannot capture and can step out of danger; threefold repetition.

Source: official rules of the World Frisian Draughts Foundation (2011), articles 1–21. The threefold repetition draw is a VOG rule: the official rules do not include it.