MESON Chess Problem Database

Problem Display
PID: 283602 (8/8/4Q3/8/8/6N1/6k1/4K2R w K - 0 1)

Grupen, Claus

Problem Observer, 1989

8/8/4Q3/8/8/6N1/6k1/4K2R

#2

4 + 1

5454 Near Snap 2026
3713 Snap 2026

SOLUTION

  • SOUND
  • Tries
    • 1.Sh5?
      • threat
        • 2.Qh3#
        • 2.Qd5#
        • 2.Qe4#
        • 2.Qc6#
      • 1...Kf3
        • 2.Qe2#
        • 2.0-0#
      • 1...Kxh1!
    • 1.Rh3?
      • 1...Kf3
        • 2.Qe4#
      • 1...Kg1!
  • Keys
    • 1.Se2!
      • threat
        • 2.Qh3#
        • 2.Qd5#
        • 2.Qe4#
        • 2.Qc6#
      • 1...Kxh1
        • 2.Qh3#
      • 1...Kf3
        • 2.0-0#

Anticipated by 283603(1932), 283601(1974)

This anticipates 89100(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(4)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • R(B);
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(C);
    • Threat
      • DUALS(4)
    • Vars
      • K(a);S_FLIGHT,XR(B)::QAR2(D)
      • K(a);S_FLIGHT::0-0
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