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Capture 3 stones has an additional rule: A player may not play a stone so that it creates a past board position. So repetition of full-board position is not allowed.
After the game ends, a result is calculated. Any stones that opponent could capture are calculated as captured. Players points are the sum of following: * The territory he has surrounded, * Captured and capturable opponents' stones. White usually gets some extra compensation for blacks' right to start the game. This is called komi. Hactar uses Japanese rules for calculating result.