MESON Chess Problem Database

Problem Display
PID: 19179 (8/6Q1/2K1k3/8/2Np4/4Pr2/2B5/8 w - - 0 1)

Wurzburg, Otto

US Problem Bulletin, 1987

8/6Q1/2K1k3/8/2Np4/4Pr2/2B5/8

#2

5 + 3

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Qd7#
    • 1...Rf7
      • 2.Qe5#
  • Tries
    • 1.Bg6?
      • threat
        • 2.Qe5#
      • 1...Rxe3
        • 2.Qf7#
      • 1...Rf6
        • 2.Qd7#
      • 1...Rf5!
    • 1.Qg6+?
      • 1...Rf6
        • 2.Qe8#
      • 1...Ke7!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Sd6#
      • 1...Kf5
        • 2.Sd6#
      • 1...Rxe3
        • 2.Sxe3#
      • 1...Rf7
        • 2.Qe5#
      • 1...Rf5
        • 2.Se5#
      • 1...Rf6
        • 2.Qd7#

Anticipated by 18504(1956)

This anticipates 87828(2000)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::QAB1(E)
    • R(a);SBLOCK::QAR1(E)
  • Tries
    • Try
      • B(A);
      • Threat
        • QAR1(E)
      • Vars
        • R(a);N_GUARD,XP(B)::QAB1(E)
        • R(a);SBLOCK::QAB1(E)
      • Refutation
        • R(a);
    • Try
      • Q(E);CHECK
      • Vars
        • R(a);P_SPINR(a),SBLOCK::QAR2(E)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(A);
    • Threat
      • B(A)+S(C)
    • Vars
      • K(c);S_FLIGHT::S(C)
      • R(a);XP(B)::B(A)+S(C),XR(a)
      • R(a);SBLOCK::QAR1(E)
      • R(a);SBLOCK::B(A)+S(C)
      • R(a);SBLOCK::QAB1(E)
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