MESON Chess Problem Database

Problem Display
PID: 229334 (2k5/7q/PKN4Q/8/8/3P4/8/8 w - - 0 1)

Myhre, Gunnar Frode

Deutsche Schachzeitung, 1977

2k5/7q/PKN4Q/8/8/3P4/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh8
      • 2.Qe6#
  • Tries
    • 1.Qg7?
      • 1...Qxd3
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qe4
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qf5
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qg6
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qg8
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh1
        • 2.Qg4#
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh2
        • 2.Qg4#
        • 2.Qb7#
      • 1...Qh3
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh4
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh5
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh6
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qh8
        • 2.Qg4#
        • 2.Qb7#
        • 2.Qc7#
      • 1...Qxg7!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qd8#
      • 1...Qa7+
        • 2.Sxa7#
      • 1...Qb7+
        • 2.axb7#
      • 1...Qc7+
        • 2.Qxc7#
      • 1...Qxd3
        • 2.Sa7#
        • 2.Se7#
        • 2.Qc7#
      • 1...Qg8
        • 2.Sa7#
        • 2.Se7#
        • 2.Qc7#
      • 1...Qh4
        • 2.Sa7#
        • 2.Qc7#
        • 2.Qe6#
      • 1...Qd7
        • 2.Qb8#
      • 1...Qe7
        • 2.Sxe7#
      • 1...Qh8
        • 2.Sa7#
        • 2.Se7#
        • 2.Qc7#
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Refutation
        • Q(a);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • Q(a);CHECK,N_GUARD::S(D),XQ(a)
      • Q(a);CHECK,OGATE::P(B),XQ(a)
      • Q(a);CHECK,N_GUARD::QAR1(E),XQ(a)
      • Q(a);SBLOCK::QAR1(E)
      • Q(a);N_GUARD::S(D),XQ(a)
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