MESON Chess Problem Database

Problem Display
PID: 159647 (4K3/4N3/N7/4k3/7P/8/QR2PP2/8 w - - 0 1)

Campbell, AWD

Comm., BCPJ (May), 1919

4K3/4N3/N7/4k3/7P/8/QR2PP2/8

#2

8 + 1

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qd5#
  • Tries
    • 1.Rb4?
      • 1...Kd6
        • 2.Qd5#
      • 1...Kf6!
    • 1.Rb5+?
      • 1...Ke4
        • 2.Qc4#
        • 2.Qa4#
      • 1...Kf4
        • 2.Qc4#
        • 2.Qa4#
      • 1...Kd6
        • 2.Qd5#
      • 1...Kf6
        • 2.Qf7#
      • 1...Kd4!
    • 1.Qc4?
      • 1...Kd6
        • 2.Qd5#
      • 1...Kf6!
    • 1.Qd5+?
      • 1...Kf4
        • 2.Rb4#
        • 2.Qd4#
        • 2.Qf5#
      • 1...Kf6!
    • 1.e3?
      • 1...Ke4
        • 2.Qd5#
      • 1...Kd6
        • 2.Qd5#
      • 1...Kf6!
  • Keys
    • 1.Qa1!
      • 1...Kd4
        • 2.Rb4#
      • 1...Ke4
        • 2.Rb4#
      • 1...Kf4
        • 2.Rb4#
      • 1...Kd6
        • 2.Rb6#
      • 1...Ke6
        • 2.Rb6#
      • 1...Kf6
        • 2.Rb6#

Anticipated by 4529(1871)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(A)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(C);
      • Vars
        • K(a);P-FLIGHT::QAB1(A)
        • K(a);S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB(A)+R(B),DCHECK
      • K(a);P-FLIGHT::R(B)
      • K(a);S_FLIGHT::R(B)
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