MESON Chess Problem Database

Problem Display
PID: 150658 (5r1k/4N3/5PpK/6Q1/8/8/8/8 w - - 0 1)

Ahlheim, Karl-Heinz

Die Schwalbe, 1985

5r1k/4N3/5PpK/6Q1/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf6
      • 2.Qxf6#
  • Tries
    • 1.Qh4?
      • threat
        • 2.Kg5#
        • 2.Kxg6#
      • 1...Rxf6
        • 2.Qxf6#
      • 1...Rg8
        • 2.Kg5#
      • 1...g5
        • 2.Kxg5#
      • 1...Rf7!
    • 1.Qd5?
      • threat
        • 2.Sxg6#
      • 1...Rxf6
        • 2.Qg8#
      • 1...Rg8
        • 2.Qxg8#
      • 1...g5
        • 2.Sg6#
      • 1...Rf7!
    • 1.f7?
      • threat
        • 2.Sxg6#
        • 2.Qf6#
        • 2.Qe5#
      • 1...Rg8
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Rxf7!
  • Keys
    • 1.Qxg6!
      • threat
        • 2.Qh7#
        • 2.Qg7#
      • 1...Rxf6
        • 2.Qxf6#
      • 1...Rf7
        • 2.Qg8#
      • 1...Rg8
        • 2.Qh7#
        • 2.Qxg8#

This is a version of 249923

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATE,XP(B)::QAB(A),XR(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);OGATE,XP(B)::QAB(A),XR(b)
        • R(b);::QAR(A)+K(C)
        • P(a);::QAR(A)+K(C),XP(a)
      • Refutation
        • R(b);
    • Try
      • Q(A);
      • Threat
        • S(D),XP(a)
      • Vars
        • R(b);N_GUARD,XP(B)::QAR1(A)
        • R(b);N_GUARD::QAR1(A),XR(b)
        • P(a);::S(D)
      • Refutation
        • R(b);
    • Try
      • P(B);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);OGATE::PXR(b)=Q
      • Refutation
        • R(b);XP(B)
  • Actual
    • Q(A);XP(a)
    • Threat
      • DUALS(2)
    • Vars
      • R(b);OGATE,P_PINQ(A),XP(B)::QAB(A),XR(b)
      • R(b);N_GUARD::QAR1(A)
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