MESON Chess Problem Database

Problem Display
PID: 152783 (7k/5R1P/2P3P1/4Kn2/8/1n6/8/4Q3 w - - 0 1)

Harley, Brian

The Observer, 1933

(First published on Sun May 7 1933)

7k/5R1P/2P3P1/4Kn2/8/1n6/8/4Q3

#2

6 + 3

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sg7
      • 2.Rf8#
  • Tries
    • 1.Kf4?
      • threat
        • 2.Qe8#
      • 1...Sd6
        • 2.Qe5#
      • 1...Sh6
        • 2.Qe5#
      • 1...Se7
        • 2.Qe5#
      • 1...Sg7
        • 2.Rf8#
      • 1...Se3!
    • 1.Qh4?
      • threat
        • 2.Qd8#
      • 1...Sd6
        • 2.Qf6#
        • 2.g7#
      • 1...Sh6
        • 2.Qf6#
      • 1...Se7
        • 2.Qf6#
        • 2.g7#
      • 1...Sg7
        • 2.Rf8#
      • 1...Sxh4!
  • Keys
    • 1.Qb1!
      • 1...Sa1
        • 2.Qb8#
      • 1...Sc1
        • 2.Qb8#
      • 1...Sd2
        • 2.Qb8#
      • 1...Sbd4
        • 2.Qb8#
      • 1...Sa5
        • 2.Qb8#
      • 1...Sc5
        • 2.Qb8#
      • 1...Se3
        • 2.g7#
      • 1...Sg3
        • 2.g7#
      • 1...Sfd4
        • 2.g7#
      • 1...Sh4
        • 2.g7#
      • 1...Sd6
        • 2.g7#
      • 1...Sh6
        • 2.g7#
      • 1...Se7
        • 2.g7#
      • 1...Sg7
        • 2.Rf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • S(b);SBLOCK::R(E)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR(A)
      • Vars
        • S(b);N_GUARD::QAB(A)
        • S(b);SBLOCK::R(E)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • S(b);N_GUARD::QAB(A)
        • S(b);SBLOCK::R(E)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • S(a);OGATE::QAR(A)
      • S(b);N_GUARD::P(D)
      • S(b);SBLOCK::R(E)
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