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Ko detection does not work correctly if old board position is viewed #289

herzbube opened this issue Jun 29, 2015 · 0 comments


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commented Jun 29, 2015

  1. Start a new human vs. human game with positional superko rule
  2. Black plays A2
  3. White plays A1
  4. Black plays B1 and captures white A1
  5. Go back one board position
  6. Try again to play black B1

Expected: This is a legal move.
Actual: The move is declared illegal, the reason being a violation of the ko rule.

Note that the problem can also occur with the simple ko rule - the positional superko rule is merely required for the above steps, which are probably the simplest way to reproduce the problem.

@herzbube herzbube self-assigned this Jun 29, 2015

@herzbube herzbube added this to the 1.2.1 milestone Jun 29, 2015

@herzbube herzbube closed this in 0374f71 Jul 3, 2015

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