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 Post subject: Yugo #1 Posted: Sun Jun 04, 2017 3:11 pm
 Lives with ko

Posts: 258
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Yugo is a Go variant which differs from Go in the following aspects:

• There are two kinds of pieces: pawns and kings. Pawns and kings of the same color can be part of the same group.
• Pawns are used for moves that don't increase the number of surrounded groups (i.e. groups without liberties) of any color.
• Kings are used for moves that increase the number of surrounded enemy groups. After such a move, all pawns in those enemy groups are removed, and then all pawns in friendly groups that remain surrounded are also removed.
• If the surrounded enemy groups only contain kings, no pieces are removed from them, but the move is still legal. Placements that surround one or more friendly groups but no enemy groups are illegal.
• At the end of the game, surrounded groups of kings score for the opponent.
• Area scoring, integer komi and the button are used.

Yugo is available to play on igGameCenter.

Examples

Stones with red squares in them represent kings.

`[go]\$\$ On the left, White can't place a pawn on the marked point because the number of surrounded groups is increased. They can't place a king there, either, because the number of surrounded enemy groups is not increased. Black, however, can place a king on that point and remove all pawns from the newly surrounded white group, as shown on the right.\$\$ ------------------- _ -------------------\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ | X X X . , . , . . |_| X X X . , . , . . |\$\$ | O O @ X X . . . . |_| . . @ X X . . . . |\$\$ | O C @ O O X , . . |_| . # @ . . X , . . |\$\$ | X O O @ X X . . . |_| X . . @ X X . . . |\$\$ | . X # X , . , . . |_| . X # X , . , . . |\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ ------------------- _ -------------------[/go]`

`[go]\$\$B On the left, White can place a king on the marked point, which increases the number of surrounded groups of both colors. The surrounded black group is checked for removals first, but none are possible, as it contains no pawns. Next, since the white group remains surrounded, the pawn that it contains is removed, as shown on the right.\$\$ ---------------------_---------------------\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ | . . , O , . , . . |_| . . , O , . , . . |\$\$ | . . O # @ . . . . |_| . . O # @ . . . . |\$\$ | . . O # O . , . . |_| . . O # O . , . . |\$\$ | . . X C X . . . . |_| . . X @ X . . . . |\$\$ | . . X O X . , . . |_| . . X . X . , . . |\$\$ | . . . X . . . . . |_| . . . X . . . . . |\$\$ | . . . . . . . . . |_| . . . . . . . . . |\$\$ ---------------------_---------------------[/go]`

_________________
Sum ergo non ero.

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