MESON Chess Problem Database

Problem Display
PID: 135703 (K7/3k4/4NQR1/7B/8/8/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2010

K7/3k4/4NQR1/7B/8/8/8/8

#2

5 + 1

SOLUTION

  • SOUND
  • Sets
    • 1...Kc8
      • 2.Qd8#
    • 1...Ke8
      • 2.Rg7#
  • Tries
    • 1.Kb7?
      • threat
        • 2.Qd8#
      • 1...Ke8
        • 2.Rg7#
      • 1...Kd6!
    • 1.Bf3?
      • threat
        • 2.Qd8#
      • 1...Kc8
        • 2.Qd8#
      • 1...Ke8
        • 2.Bc6#
      • 1...Kd6!
    • 1.Qe7+?
      • 1...Kc6
        • 2.Sc7#
      • 1...Kc8
        • 2.Rg8#
        • 2.Qd8#
        • 2.Qb7#
        • 2.Qc7#
        • 2.Qe8#
      • 1...Kxe7!
  • Keys
    • 1.Qe5!
      • 1...Kc6
        • 2.Sf8#
      • 1...Ke7
        • 2.Rg7#
      • 1...Kc8
        • 2.Qc7#
      • 1...Ke8
        • 2.Rg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(C)
    • K(a);S_FLIGHT::B(A)+R(D)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::B(A)+R(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • B(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
        • K(a);S_FLIGHT::B(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::R(D)+S(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(a);S_FLIGHT::R(D)+S(B)
      • K(a);P-FLIGHT::R(D)
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);S_FLIGHT::B(A)+R(D)
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