MESON Chess Problem Database

Problem Display
PID: 15218 (8/n5N1/6R1/3k3K/8/1P2Q3/8/8 w - - 0 1)

Froberg, Johan Hilding Laurentius

Expressen, 1981

8/n5N1/6R1/3k3K/8/1P2Q3/8/8

#2

5 + 2

5454 Near Snap 2023

SOLUTION

  • SOUND
  • Tries
    • 1.Se8?
      • threat
        • 2.Sc7#
        • 2.Rd6#
      • 1...Sc8
        • 2.Sc7#
      • 1...Sb5!
    • 1.Qd3+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Ke5!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxe4!
    • 1.Qe6+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Kd4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Se7#
        • 2.Rd6#
        • 2.Qd4#
      • 1...Sb5
        • 2.Se7#
      • 1...Sc6
        • 2.Rd6#
      • 1...Sc8
        • 2.Qd4#

Anticipated by 273900(1972)

This anticipates 271334(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::S(E)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(E);
    • Threat
      • DUALS(3)
    • Vars
      • S(b);::S(E)
      • S(b);::R1(D)
      • S(b);::QAR1(B)
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