MESON Chess Problem Database

Problem Display
PID: 176171 (8/7K/8/8/4kB2/4P3/2R5/Q7 w - - 0 1)

Zander, Heinz

Schach-Echo, 1960

8/7K/8/8/4kB2/4P3/2R5/Q7

#2

5 + 1

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qe5#
  • Tries
    • 1.Rg2?
      • 1...Kd3
        • 2.Qd4#
      • 1...Kf3
        • 2.Qa8#
      • 1...Kf5
        • 2.Qe5#
      • 1...Kd5!
    • 1.Qe5+?
      • 1...Kd3
        • 2.Qf5#
      • 1...Kf3!
    • 1.Qf6?
      • 1...Kd3
        • 2.Qf5#
        • 2.Qg6#
      • 1...Kd5
        • 2.Qe5#
        • 2.Qf5#
        • 2.Qc6#
      • 1...Kf3!
    • 1.Qf1?
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5!
    • 1.Qg1?
      • 1...Kd3
        • 2.Qg6#
      • 1...Kf3
        • 2.Qg2#
      • 1...Kf5
        • 2.Qg6#
      • 1...Kd5!
    • 1.Qa5?
      • 1...Kd3
        • 2.Qf5#
      • 1...Kf3!
    • 1.Qa6?
      • 1...Kd5
        • 2.Qc4#
        • 2.Qc6#
      • 1...Kf5
        • 2.Qg6#
      • 1...Kf3!
  • Keys
    • 1.Qg7!
      • 1...Kd3
        • 2.Qg6#
      • 1...Kf3
        • 2.Qg2#
      • 1...Kd5
        • 2.Qe5#
      • 1...Kf5
        • 2.Qg6#

Anticipated by 41263(1939)

This anticipates 199603(1996), 142483(2006), 231062(2011)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(A)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB(A)
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);S_FLIGHT::QAR1(A)
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