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19:52
21 hours? That's just a shame. Here's something to spur you all on, even if it isn't very clever:
12. ... Nd4
  +---+---+---+---+---+---+---+---+
8 |   |  .|bK |bR.|   |bB.|   |bR.|
  +---+---+---+---+---+---+---+---+
7 | b.| b |  .|bQ |  .| b | b.| b |
  +---+---+---+---+---+---+---+---+
6 |   |  .|   |  .|   |  .|bB |  .|
  +---+---+---+---+---+---+---+---+
5 |  .|   | b.| b |  .|   |wN.|   |
  +---+---+---+---+---+---+---+---+
4 |   |  .|   |bN.| w |  .|   |  .|
  +---+---+---+---+---+---+---+---+
3 |  .|wQ |  .| w |  .|   | w.|   |
  +---+---+---+---+---+---+---+---|
2 | w | w.|   |  .|   | w.|wB | w.|

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