MESON Chess Problem Database

Problem Display
PID: 24321 (8/5Q2/5N2/4pk2/4N3/8/8/5K2 w - - 0 1)

Jensen, W

Nord Stierhen, 1885

8/5Q2/5N2/4pk2/4N3/8/8/5K2

#2

4 + 2

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qa2?
      • 1...Kf4
        • 2.Qf2#
      • 1...Kg6!
    • 1.Qb7?
      • 1...Ke6
        • 2.Qd7#
      • 1...Kg6
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qc7?
      • 1...Ke6
        • 2.Qd7#
      • 1...Kg6
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qd7+?
      • 1...Kg6
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qe7?
      • 1...Kg6
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qg7?
      • threat
        • 2.Qg4#
      • 1...Ke6
        • 2.Qd7#
      • 1...Kf4!
    • 1.Qh7+?
      • 1...Ke6
        • 2.Qd7#
      • 1...Kf4!
  • Keys
    • 1.Qa7!
      • 1...Kf4
        • 2.Qf2#
      • 1...Ke6
        • 2.Qd7#
      • 1...Kg6
        • 2.Qh7#

Anticipated by 206947(1859), 4506(1873), 32680(1873), 214539(1878), 218488(1882), 218611(1882)

This anticipates 181144(1904), 182379(1906), 109336(1920), 206740(1925), 227725(1926), 76425(1929), 46372(1941), 18804(1958), 218807(1976), 138100(1981), 133136(1983), 211346(1986), 184446(2000), 47757(2003), 67253(2006), 232491(2012), 235007(2019)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::QAR2(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(a)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);
      • Threat
        • QAB1(D)
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(b);P-FLIGHT::QAR2(D)
      • K(b);S_FLIGHT::QAB1(D)
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