Advantage Detection Guide:
Part of the Beginner's Chess Guide (Section 3)
Occupation occurs when a Rook or Queen has a clear line of sight along an entire Rank or File ... The Queen or Rook will have Control - be it Shared or Dominant - of all the squares along those respective Ranks or Files that they Occupy.
Occupation often only occurs during the mid-to-later stages of the Middlegame phase, when both armies are significantly depleted, giving more clear space for Queens and Rooks to Control entire Ranks and/or Files.
Moving On: Point Count (Page 7).
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