MESON Chess Problem Database

Problem Display
PID: 232342 (BB4K1/3P4/4k3/7P/8/8/2Q5/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1973

BB4K1/3P4/4k3/7P/8/8/2Q5/8

#2

6 + 1

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Kf8?
      • 1...Kf6
        • 2.Qg6#
      • 1...Kxd7!
    • 1.Qe4+?
      • 1...Kf6
        • 2.Qe5#
        • 2.d8Q#
        • 2.d8B#
      • 1...Kxd7!
    • 1.Qc5?
      • 1...Kf6
        • 2.Qe5#
      • 1...Kxd7!
    • 1.Qc6+?
      • 1...Kf5
        • 2.Qg6#
      • 1...Ke7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.d8Q#
        • 2.d8B#
      • 1...Kf5
        • 2.d8Q#
        • 2.d8B#
      • 1...Kf6
        • 2.d8Q#
        • 2.d8B#
      • 1...Ke7
        • 2.d8Q#

This anticipates 85793(1983)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT,XP(C)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XP(C)
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XP(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • P=Q
    • Vars
      • K(a);S_FLIGHT::P=Q
      • K(a);P-FLIGHT::P=Q
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