MESON Chess Problem Database

Problem Display
PID: 197826 (8/3Q4/8/8/Nk6/4K3/2R5/8 w - - 0 1)

Gunn, Robert Ivan

The Observer, 1944

(First published on Sun May 7 1944)

8/3Q4/8/8/Nk6/4K3/2R5/8

#2

4 + 1

5454 Near Snap 2019
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Sb2?
      • threat
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...Kb3
        • 2.Qa4#
      • 1...Ka5!
    • 1.Sc5?
      • threat
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...Ka5!
    • 1.Sb6?
      • threat
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...Kb3
        • 2.Qa4#
      • 1...Ka5!
    • 1.Rb2+?
      • 1...Kc4
        • 2.Qb5#
        • 2.Qc6#
        • 2.Qe6#
        • 2.Qd3#
        • 2.Qd4#
        • 2.Qf7#
      • 1...Ka5
        • 2.Qb5#
        • 2.Qa7#
      • 1...Ka3!
  • Keys
    • 1.Sc3!
      • 1...Ka3
        • 2.Qa4#
      • 1...Kb3
        • 2.Qa4#
      • 1...Kc4
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...Kc5
        • 2.Sd5#

Anticipated by 6621(1932), 41413(1935)

This anticipates 12216(1976)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT::QAR1(D)
      • K(a);P-FLIGHT::QAB1(D)
      • K(a);S_FLIGHT::R(A)+S(C)
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