MESON Chess Problem Database

Problem Display
PID: 224541 (1n6/8/p3n3/P3p3/Q1P1k1p1/1N3RP1/2P2P2/5K2 w - - 0 1)

Billington, Thomas Henry

English Mechanic and World of Science, 1887

(First published on Fri May 13 1887)

1n6/8/p3n3/P3p3/Q1P1k1p1/1N3RP1/2P2P2/5K2

#2

9 + 6

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf3
      • 2.Sd2#
    • 1...Sd4
      • 2.Sd2#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sd7
      • 2.Qc6#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Sd2#
        • 2.Qd3#
        • 2.Qd5#
      • 1...Kxf3
        • 2.Sd2#
        • 2.Qd3#
      • 1...gxf3
        • 2.Qd3#
        • 2.Qh7#
      • 1...Sd4
        • 2.Sd2#
        • 2.Re3#
        • 2.Qxg4#
        • 2.Qd5#
      • 1...Sf4
        • 2.Sd2#
        • 2.Re3#
      • 1...Sc5
        • 2.Sd2#
        • 2.Re3#
        • 2.Qxg4#
        • 2.Qf5#
        • 2.Qd5#
      • 1...Sc7
        • 2.Sd2#
        • 2.Re3#
        • 2.Qxg4#
        • 2.Qf5#
        • 2.Qd3#
      • 1...Sxd7!
  • Keys
    • 1.Qe8!
      • 1...Kxf3
        • 2.Sd2#
      • 1...gxf3
        • 2.Qg6#
      • 1...Sf4
        • 2.Rxf4#
      • 1...Sd4
        • 2.Sd2#
        • 2.Rf4#
      • 1...Sc5
        • 2.Rf4#
      • 1...Sg5
        • 2.Rf4#
      • 1...Sc7
        • 2.Rf4#
      • 1...Sg7
        • 2.Rf4#
      • 1...Sd8
        • 2.Rf4#
      • 1...Sf8
        • 2.Rf4#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sd7
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT,XR(E)::S(D)
    • S(e);SBLOCK::S(D)
    • S(f);N_GUARD::QAB(G),XS(f)
    • S(f);N_GUARD::QAB(G)
  • Tries
    • Try
      • Q(G);
      • Threat
        • DUALS(3)
      • Refutation
        • S(f);XQ(G)
  • Actual
    • Q(G);
    • Vars
      • K(a);S_FLIGHT,XR(E)::S(D)
      • P(b);SBLOCK,XR(E)::QAB(G)
      • S(e);N_GUARD,P_SPINP(c)::R1(E),XS(e)
      • S(e);N_GUARD,P_SPINP(c)::R1(E)
      • S(f);N_GUARD::QAB(G),XS(f)
      • S(f);OGATE::QAB(G)
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