MESON Chess Problem Database

Problem Display
PID: 15659 (4k2r/7n/4P3/3N4/8/8/4K3/7Q w k - 0 1)

Froberg, Johan Hilding Laurentius

Springaren, 1986

4k2r/7n/4P3/3N4/8/8/4K3/7Q

#2

4 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg5
      • 2.Qxh8#
  • Tries
    • 1.Qh5+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kd8!
    • 1.Qxh7?
      • threat
        • 2.Qe7#
        • 2.Qxh8#
      • 1...Kd8
        • 2.Qd7#
        • 2.Qxh8#
      • 1...Kf8
        • 2.Qf7#
        • 2.Qxh8#
      • 1...Rf8
        • 2.Qd7#
        • 2.Qe7#
      • 1...Rg8
        • 2.Qxg8#
        • 2.Qe7#
      • 1...Rxh7!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa8#
      • 1...Kd8
        • 2.Qa8#
      • 1...Kf8
        • 2.Qxh8#
      • 1...0-0
        • 2.Se7#

Anticipated by 47560(1947)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::QAR(A),XR(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(2)
      • Refutation
        • R(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)
    • Vars
      • K(b);P-FLIGHT::QAR(A)
      • K(b);P-FLIGHT::QAR2(A),XR(c)
      • K(b);0-0::S(C)
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