MESON Chess Problem Database

Problem Display
PID: 19333 (B1Q5/1q1r4/k7/3p4/K7/8/8/R5B1 w - - 0 1)

Ling, John Francis

Chess, 1942

B1Q5/1q1r4/k7/3p4/K7/8/8/R5B1

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc8
      • 2.Kb4#
    • 1...Rd6
      • 2.Bxb7#
      • 2.Qxb7#
    • 1...Rd8
      • 2.Bxb7#
      • 2.Qxb7#
  • Tries
    • 1.Qc4+?
      • 1...Qb5+
        • 2.Qxb5#
      • 1...dxc4!
    • 1.Qc6+?
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qxc6+!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qa5#
      • 1...Qc6+
        • 2.Qxc6#
      • 1...Qb3+
        • 2.Kxb3#
      • 1...Qb4+
        • 2.Kxb4#
      • 1...Qb5+
        • 2.Qxb5#
      • 1...Qxa8
        • 2.Qb6#
        • 2.Qb5#
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qc7
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_SPINQ(c),XQ(E)::R(A)+K(C)
  • Tries
    • Try
      • Q(E);CHECK,N_PINQ(c)
      • Vars
        • Q(c);CHECK,N_GUARD,P_SPINQ(c)::QAB1(E),XQ(c)
      • Refutation
        • P(a);XQ(E)
    • Try
      • Q(E);CHECK,N_PINQ(c)
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR1(E),XQ(c)
      • Refutation
        • Q(c);CHECK,XQ(E)
  • Actual
    • Q(E);N_PINQ(c)
    • Threat
      • QAR1(E)
    • Vars
      • Q(c);CHECK,N_GUARD::QAR2(E),XQ(c)
      • Q(c);CHECK::R(A)+K(C),XQ(c)
      • Q(c);CHECK,N_GUARD::QAB1(E),XQ(c)
      • Q(c);N_GUARD::QAR1(E),XQ(c)
      • Q(c);N_GUARD::QAB1(E)
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