cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A274684 White to move: King and Queen vs. King: Number of positions with mate in n.

Original entry on oeis.org

2448, 5012, 9064, 19964, 26164, 32064, 32104, 15000, 2680, 8
Offset: 1

Views

Author

David A. Corneth, Jul 02 2016

Keywords

Comments

After n = 10, all terms are 0 so the sequence ends at n = 10.
GBR code is 1000. Longest checkmate under perfect play is in 10 (FEN 8/8/8/5k2/8/8/1Q6/K7 w - - 0 1). For path of moves, see k4it-link. Data is found using Kryukov link, "Endgame Tablebases online". FEN is found in Kryukov link, "Longest checkmates in chess".
The listed examples, or more generally up to 6 man positions can be examined using the k4it link.

References

  • Hans Zellner, International Computer Chess Association Journal, 1987, Vol. 10, No. 2, p. 95.

Links

Crossrefs

Cf. A225551, A274458, A274683.

Extensions

Data and comments changed by Vaclav Kotesovec, Aug 01 2016
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