MESON Chess Problem Database

Problem Display
PID: 271334 (4n3/K7/8/1Nk5/Q7/8/8/3R4 w - - 0 1)

Muller, Dieter

1st Prize, Buletin Problemistic TT, 1985

4n3/K7/8/1Nk5/Q7/8/8/3R4

#2

4 + 2

15601 Albrecht-Leiss-Degener Collection 2023
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qc4#
  • Tries
    • 1.Sa3?
      • threat
        • 2.Qb5#
        • 2.Qc4#
      • 1...Sc7
        • 2.Qc4#
      • 1...Sd6!
    • 1.Sd6?
      • threat
        • 2.Se4#
        • 2.Sb7#
        • 2.Qb5#
        • 2.Qc4#
      • 1...Sf6
        • 2.Sb7#
        • 2.Qb5#
        • 2.Qc4#
      • 1...Sc7
        • 2.Se4#
        • 2.Sb7#
        • 2.Qc4#
      • 1...Sxd6!
    • 1.Sc7?
      • threat
        • 2.Sa6#
        • 2.Se6#
        • 2.Rd5#
        • 2.Qb5#
      • 1...Sd6
        • 2.Sa6#
        • 2.Se6#
        • 2.Rd5#
      • 1...Sf6
        • 2.Sa6#
        • 2.Se6#
        • 2.Qb5#
      • 1...Sg7
        • 2.Sa6#
        • 2.Rd5#
        • 2.Qb5#
      • 1...Sxc7!
    • 1.Rd4?
      • threat
        • 2.Qc4#
      • 1...Kc6
        • 2.Qc4#
      • 1...Sd6!
    • 1.Rd5+?
      • 1...Kc6
        • 2.Qc4#
      • 1...Kxd5!
    • 1.Qb3?
      • threat
        • 2.Rc1#
      • 1...Kc6
        • 2.Qc4#
        • 2.Qd5#
      • 1...Sd6!
    • 1.Qb4+?
      • 1...Kc6
        • 2.Qc4#
      • 1...Kxb4!
    • 1.Qd4+?
      • 1...Kc6
        • 2.Qb6#
        • 2.Qc4#
        • 2.Qd5#
      • 1...Kxb5!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Se4#
        • 2.Rd5#
        • 2.Qb5#
      • 1...Sd6
        • 2.Rd5#
      • 1...Sf6
        • 2.Qb5#
      • 1...Sc7
        • 2.Se4#

Anticipated by 273900(1972), 15218(1981)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(a);N_GUARD,P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::QAR1(B)
      • Refutation
        • S(b);
    • Try
      • S(C);
      • Threat
        • DUALS(4)
      • Refutation
        • S(b);XS(C)
    • Try
      • S(C);
      • Threat
        • DUALS(4)
      • Refutation
        • S(b);XS(C)
    • Try
      • R(A);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • S(b);
    • Try
      • R(A);CHECK
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • Q(B);
      • Threat
        • R(A)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XS(C)
  • Actual
    • S(C);
    • Threat
      • DUALS(3)
    • Vars
      • S(b);::R1(A)
      • S(b);::QAR1(B)
      • S(b);::S(C)
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