Well, I don't know if it's obscure, but it's a rule of brained queen movement. It's explained thoroughly in
Advanced Concepts' Advanced Brain Movement level.
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×From 1, the brain pathmap to Beethro points in an orthogonal direction - either North or West. This results in the queen's movement being directed either south or east respectively - and since the queen is in the northwest quadrant of the room, that gets adjusted to southeast, since brained queens always try to move diagonally.
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Quick links to my stuff (in case you forgot where it was):
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[Last edited by Chaco at 07-06-2014 03:15 AM]