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A225554
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Longest checkmate in king and empress versus king endgame on an n X n chessboard.
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7
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3, 5, 7, 8, 10, 11, 13, 14, 16, 18, 19, 21, 23, 25, 26, 28, 30, 32, 34, 35, 37, 39, 41, 43, 44, 46, 48, 50, 52, 53, 55, 57, 59, 61, 63, 64, 66, 68
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OFFSET
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3,1
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COMMENTS
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An empress moves like a rook and a knight.
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LINKS
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FORMULA
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Conjecture: a(n) ~ 7*n/4.
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EXAMPLE
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Longest win on an 8x8 chessboard: Ka1 EMb1 - Kd4, 1.Ka1-a2 Kd4-e5 2.Ka2-b3 Ke5-f4 3.Kb3-c3 Kf4-e5 4.EMb1-b6! Ke5-f4 5.Kc3-d4 Kf4-g5 6.Kd4-e4 Kg5-g4! 7.EMb6-e6 Kg4-g3! 8.EMe6-f4! Kg3-h2! 9.Ke4-f3! Kh2-g1! 10.Kf3-g3 Kg1-h1! 11.EMf4-f1#, therefore a(8) = 11.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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