MESON Chess Problem Database

Problem Display
PID: 79357 (8/8/4Q3/4b3/4k3/4N3/4K3/8 w - - 0 1)

Davey, David Murray

The Tablet, 1964

(First published on Sat Sep 26 1964)

8/8/4Q3/4b3/4k3/4N3/4K3/8

#2

3 + 2

3713 Snap 1964
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc4#
    • 1...Kf4
      • 2.Qg4#
  • Tries
    • 1.Kd2?
      • 1...Kd4
        • 2.Qc4#
        • 2.Qd5#
      • 1...Kf4
        • 2.Qg4#
      • 1...Kf3!
    • 1.Kf2?
      • 1...Kd4
        • 2.Qc4#
      • 1...Kf4
        • 2.Qg4#
        • 2.Qf5#
      • 1...Kd3!
    • 1.Qc6+?
      • 1...Kd4
        • 2.Sc2#
        • 2.Sf5#
        • 2.Qc4#
      • 1...Kf4!
    • 1.Qg6+?
      • 1...Kf4
        • 2.Sg2#
        • 2.Sd5#
        • 2.Qg4#
      • 1...Kd4!
  • Keys
    • 1.Qe7!
      • 1...Kd4
        • 2.Qb4#
      • 1...Kf4
        • 2.Qh4#

Anticipated by 2709(0000), 4630(1884), 73187(1921)

This anticipates 65707(1999)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINB(b),P-FLIGHT::QAR1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);N_SPINB(b),S_FLIGHT
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);N_SPINB(b),P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);N_SPINB(b),S_FLIGHT
    • Try
      • Q(C);CHECK,N_PINB(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK,N_PINB(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);N_SPINB(b),P-FLIGHT::QAR2(C)
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