MESON Chess Problem Database

Problem Display
PID: 60766 (8/7Q/RNk5/4K3/b7/1p6/1P6/8 w - - 0 1)

Nasra, Gabriel G

Bulletin de la FFE, 1927

8/7Q/RNk5/4K3/b7/1p6/1P6/8

#2

5 + 3

5454 Near Snap 2017

SOLUTION

  • SOUND
  • Tries
    • 1.Kd4?
      • threat
        • 2.Qd7#
      • 1...Kd6
        • 2.Sxa4#
        • 2.Sc4#
        • 2.Sc8#
      • 1...Kb5!
    • 1.Qc2+?
      • 1...Kb5
        • 2.Qc4#
      • 1...Kb7
        • 2.Qc8#
      • 1...bxc2!
    • 1.Qe4+?
      • 1...Kb5
        • 2.Qc4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Kc7!
    • 1.Qc7+?
      • 1...Kb5
        • 2.Qc4#
      • 1...Kxc7!
    • 1.Qf7?
      • 1...Kb5
        • 2.Qc4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Bb5!
  • Keys
    • 1.Qg8!
      • 1...Kb5
        • 2.Qc4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Kb7
        • 2.Qc8#
      • 1...Kc7
        • 2.Qc8#
      • 1...Bb5
        • 2.Qc8#

This anticipates 153212(2011)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAB1(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(E)
        • K(c);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • P(a);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(E)
        • K(c);P-FLIGHT::QAR1(E)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(c);P-FLIGHT,XQ(E)
    • Try
      • Q(E);
      • Vars
        • K(c);S_FLIGHT::QAB1(E)
        • K(c);P-FLIGHT::QAR1(E)
      • Refutation
        • B(b);
  • Actual
    • Q(E);
    • Vars
      • K(c);S_FLIGHT::QAB1(E)
      • K(c);P-FLIGHT::QAR1(E)
      • B(b);SBLOCK::QAR2(E)
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