MESON Chess Problem Database

Problem Display
PID: 211727 (Q3N3/3k4/5BK1/b7/8/N7/8/8 w - - 0 1)

Jago, Maurice EM

The Problemist, 1986

Q3N3/3k4/5BK1/b7/8/N7/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qc6#
  • Tries
    • 1.Qd5+?
      • 1...Kxe8
        • 2.Qf7#
      • 1...Kc8!
    • 1.Qb7+?
      • 1...Ke6
        • 2.Qc6#
        • 2.Qf7#
      • 1...Kxe8
        • 2.Qe7#
        • 2.Qf7#
      • 1...Bc7!
  • Keys
    • 1.Qxa5!
      • 1...Kc6
        • 2.Qb5#
      • 1...Ke6
        • 2.Qf5#
      • 1...Kc8
        • 2.Qc7#
      • 1...Kxe8
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR2(D)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XS(E)::QAB1(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • Q(D);XB(a)
    • Vars
      • K(b);S_FLIGHT::QAB1(D)
      • K(b);S_FLIGHT::QAR1(D)
      • K(b);S_FLIGHT,XS(E)::QAR1(D)
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