MESON Chess Problem Database

Problem Display
PID: 85762 (7B/1P3kP1/Q5N1/7B/7K/8/8/8 w - - 0 1)

Speckmann, Werner

Berliner Morgenpost, 1971

7B/1P3kP1/Q5N1/7B/7K/8/8/8

#2

7 + 1

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sf8+?
      • 1...Kg8
        • 2.Qc4#
        • 2.Qa2#
        • 2.Qe6#
      • 1...Ke7!
    • 1.Bg4?
      • threat
        • 2.Qe6#
      • 1...Ke8
        • 2.g8Q#
      • 1...Kg8!
    • 1.Qd6?
      • threat
        • 2.Se7#
      • 1...Ke8
        • 2.Sf4#
        • 2.Se5#
        • 2.Se7#
        • 2.Sf8#
        • 2.Qe7#
        • 2.g8Q#
      • 1...Kg8!
    • 1.b8S?
      • 1...Ke8
        • 2.g8Q#
      • 1...Kg8!
  • Keys
    • 1.Qd3!
      • 1...Ke6
        • 2.g8Q#
        • 2.g8B#
      • 1...Kf6
        • 2.g8Q#
        • 2.g8B#
      • 1...Ke8
        • 2.g8Q#
      • 1...Kg8
        • 2.Se7#

This anticipates 249386(1972)

There are these versions: 178328

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • B(B);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT::P=Q
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • B(B)+S(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(E);
      • Vars
        • K(a);S_FLIGHT::P=Q
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);S_FLIGHT::P=Q
      • K(a);P-FLIGHT::P=Q
      • K(a);S_FLIGHT::S(D)
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