Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A q-queens problem. VII. Combinatorial types of nonattacking chess
  riders   On a convex polygonal chessboard, the number of combinatorial types of
nonattacking configuration of three identical chess riders with $r$ moves, such
as queens, bishops, or nightriders, equals $r(r^2+3r-1)/3$, as conjectured by
Chaiken, Hanusa, and Zaslavsky (2019). Similarly, for any number of identical
3-move riders the number of combinatorial types is independent of the actual
moves.

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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg