Bug report: Fuego rejected the move B4 played by me

[herzbube]

Little Go 1.3.1 was released with the expectation to have finally squashed all possible causes for the dreaded "Your move was rejected by Fuego" message. Yet it appears that there is still at least one more possible cause: One and a half years after the release of 1.3.1, in July 2018, I received another bug report with the very same message.

The problem is reproducible in a dev environment, using the in-memory-objects.plist file that is part of the bug report .zip archive. Unfortunately the .zip archive contains almost no log files, so I have no idea how the user who submitted the bug report managed to manufacture the situation.

For the moment I'm leaving this issue open, hopefully I will receive another bug report with more logging information.

[herzbube]

littlego-bugreport.zip

[herzbube]

Observations:

• currentgame.sgf looks OK. Specifically it's not a game file that contains board setup commands (which Little Go cannot handle at the moment).
• Restoring the game state from in-memory-objects.plist shows a slightly different board than loading the game from currentgame.sgf.
  • B5 is empty, but should be white
  • B4 is empty, but should be black
  • B3 is white, but should be empty
  • A3 is empty, but should be black
  • B2 is empty, but should be black
• In both cases the move list is this: gogui-play_sequence B G7 W F7 B E7 W G6 B G5 W G4 B G3 W F5 B F4 W E4 B G5 W F3 B E3 W G4 B A7 W A5 B C5 W B6 B C4 W B7 B C3 W A6 B D3 W C2 B D4 W D2 B D5 W E2 B E5 W E6 B F4 W D6 B G5 W C6 B F2 W F1 B E1 W G2 B G1 W B5 B B4 W B3 B A3 W A2 B B2 W A4 B C1 W B1 B E4 W G4 B F3 W D1 B G5 W F1 B F6 W G2 B G7 W D7 B F5 W F7
• Comparing the captures in the move list reveals some differences:
  • Correct: Move 45 captures 1 stone
  • Wrong: Move 46 captures 1 stone, move 48 captures 1 stone
• Going backwards the problem occurs at move 41: in this move black plays on B4, but on the board the intersection is empty