MESON Chess Problem Database

Problem Display
PID: 227094 (8/1kNN4/8/B3K3/Q7/8/8/8 w - - 0 1)

Wurzburg, Otto

US Problem Bulletin, 1985

8/1kNN4/8/B3K3/Q7/8/8/8

#2

5 + 1

SOLUTION

  • SOUND
  • Tries
    • 1.Qb3+?
      • 1...Kc6
        • 2.Qd5#
        • 2.Qb5#
      • 1...Ka7
        • 2.Qb6#
        • 2.Qb8#
      • 1...Kc8!
    • 1.Qb5+?
      • 1...Ka7
        • 2.Qa6#
        • 2.Qb6#
        • 2.Qb8#
      • 1...Kc8!
    • 1.Qc6+?
      • 1...Ka7
        • 2.Sb5#
        • 2.Bb6#
        • 2.Qa8#
        • 2.Qa6#
        • 2.Qb6#
      • 1...Kc8
        • 2.Sb5#
        • 2.Sd5#
        • 2.Sa6#
        • 2.Se6#
        • 2.Sa8#
        • 2.Se8#
      • 1...Kxc6!
    • 1.Qb4+?
      • 1...Kc6
        • 2.Sb8#
        • 2.Qb5#
      • 1...Ka7
        • 2.Qb6#
        • 2.Qb8#
      • 1...Kc8!
    • 1.Qc4?
      • threat
        • 2.Qa6#
      • 1...Ka7
        • 2.Qa6#
      • 1...Kc8!
    • 1.Qd4?
      • 1...Kc6
        • 2.Qd5#
      • 1...Kc8!
    • 1.Qe4+?
      • 1...Ka7
        • 2.Bb6#
        • 2.Qa8#
      • 1...Kc8!
  • Keys
    • 1.Sb5!
      • 1...Ka6
        • 2.Sc5#
      • 1...Kc6
        • 2.Sd6#
      • 1...Ka8
        • 2.Qe4#
      • 1...Kc8
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(D);
    • Vars
      • K(a);S_FLIGHT::S(E)
      • K(a);S_FLIGHT::QAB(A)+S(D)
      • K(a);S_FLIGHT::QAB(A)
      • K(a);S_FLIGHT::S(D)
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