MESON Chess Problem Database

Problem Display
PID: 989 (q1n3b1/8/pp4Q1/3kN3/R7/1N6/2K5/B7 w - - 0 1)

Shire, David J

The Problemist Supplement, 1995

q1n3b1/8/pp4Q1/3kN3/R7/1N6/2K5/B7

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qc6+
      • 2.Qxc6#
    • 1...Qa7
      • 2.Qc6#
    • 1...Qb8
      • 2.Qc6#
    • 1...Be6
      • 2.Qd3#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Se3#
      • 1...Be6
        • 2.Qg2#
      • 1...Qc6
        • 2.Qf5#
      • 1...Sd6!
    • 1.Qf7+?
      • 1...Kd6
        • 2.Qd7#
      • 1...Bxf7!
    • 1.Qf6?
      • threat
        • 2.Rd4#
      • 1...Qc6+
        • 2.Qxc6#
      • 1...Bh7+!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Rd4#
      • 1...Qc6+
        • 2.Sc4#
      • 1...Kd6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(d);CHECK,N_GUARD::QAB1(F),XQ(d)
    • Q(d);N_GUARD::QAB1(F)
    • B(f);SBLOCK::QAR2(F)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • B(f);SBLOCK::QAB(F)
        • Q(d);P_PINS(E),SBLOCK::QAR2(F)
      • Refutation
        • S(e);
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(F)
      • Refutation
        • B(f);XQ(F)
    • Try
      • Q(F);
      • Threat
        • R1(D)
      • Vars
        • Q(d);CHECK,N_GUARD::QAB1(F),XQ(d)
      • Refutation
        • B(f);CHECK
  • Actual
    • Q(F);
    • Threat
      • R1(D)
    • Vars
      • Q(d);CHECK,SBLOCK::QAR(F)+S(E)
      • K(a);P-FLIGHT::QAR1(F)
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