The game starts from an empty board, and black plays the first stone. The goal is to surround empty territory and capture opponents stones. Game ends when both players pass. Stones can be captured in the same way as in capture-go. Repetition of same board position is forbidden similarly to capture 3 game.
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.
In following problems you need to identify last remaining place, where points could be gained, or reduced. The gained points are marked in the correct answer. The lost reduction opportunities are marked in wrong variations.