MESON Chess Problem Database

Problem Display
PID: 227725 (7Q/8/3N4/2k5/2N1P3/8/8/K7 w - - 0 1)

Hansen, Borge

Illustrated Family Journal, 1926

7Q/8/3N4/2k5/2N1P3/8/8/K7

#2

5 + 1

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qc8#
  • Tries
    • 1.Kb1?
      • 1...Kc6
        • 2.Qc8#
      • 1...Kb4!
    • 1.Ka2?
      • 1...Kc6
        • 2.Qc8#
      • 1...Kb4!
    • 1.Kb2?
      • 1...Kc6
        • 2.Qc8#
      • 1...Kb4!
    • 1.Qa8?
      • 1...Kb4
        • 2.Qa3#
      • 1...Kd4!
    • 1.Qb8?
      • threat
        • 2.Qb6#
      • 1...Kc6
        • 2.Qc8#
      • 1...Kd4!
  • Keys
    • 1.Qh3!
      • 1...Kb4
        • 2.Qa3#
      • 1...Kd4
        • 2.Qe3#
      • 1...Kc6
        • 2.Qc8#

Anticipated by 206947(1859), 4506(1873), 32680(1873), 214539(1878), 218488(1882), 24321(1885), 181144(1904), 182379(1906), 109336(1920), 22076(1924), 206740(1925)

This anticipates 76425(1929), 46372(1941), 18804(1958), 218807(1976), 138100(1981), 133136(1983), 211346(1986), 184446(2000), 47757(2003), 67253(2006), 235007(2019)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR2(E)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);P-FLIGHT::QAR2(E)
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