MESON Chess Problem Database

Problem Display
PID: 7549 (8/1N6/2Q3K1/4k3/8/1P6/3P1P2/8 w - - 0 1)

Petkov, Petko Andonov

Petkov's Miniatures, 1991

8/1N6/2Q3K1/4k3/8/1P6/3P1P2/8

#2

6 + 1

3840 Petkov Selected Compositions 2000
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qd5+?
      • 1...Kf4
        • 2.Qf5#
      • 1...Kxd5!
    • 1.Qd7?
      • 1...Kf4
        • 2.Qf5#
      • 1...Ke4!
    • 1.Qc5+?
      • 1...Kf4
        • 2.Qf5#
      • 1...Ke6
        • 2.Qd6#
      • 1...Ke4!
    • 1.d3?
      • threat
        • 2.Qe4#
        • 2.Qd6#
      • 1...Kf4
        • 2.Qe4#
      • 1...Kd4!
    • 1.f3?
      • threat
        • 2.Qe4#
        • 2.Qd6#
      • 1...Kd4
        • 2.Qe4#
        • 2.Qd6#
      • 1...Kf4!
    • 1.f4+?
      • 1...Kd4
        • 2.Qc4#
      • 1...Kxf4!
  • Keys
    • 1.Sc5!
      • 1...Kd4
        • 2.Qd6#
      • 1...Kf4
        • 2.Qe4#

This anticipates 231060(2004)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XQ(D)
    • Try
      • Q(D);
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(B);
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XP(B)
  • Actual
    • S(F);
    • Vars
      • K(a);S_FLIGHT::QAR2(D)
      • K(a);S_FLIGHT::QAR1(D)
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