MESON Chess Problem Database

Problem Display
PID: 85708 (7k/3R4/5P2/5b2/7K/1B6/1Q6/8 w - - 0 1)

Speckmann, Werner

Sp. Comm., Schach-Aktiv, 1989

7k/3R4/5P2/5b2/7K/1B6/1Q6/8

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bh7
      • 2.f7#
  • Tries
    • 1.Bc2?
      • threat
        • 2.Qb8#
      • 1...Kg8
        • 2.Qb8#
      • 1...Bxd7
        • 2.f7#
      • 1...Be6
        • 2.f7#
      • 1...Bh7
        • 2.f7#
      • 1...Bg6!
    • 1.Rh7+?
      • 1...Bxh7
        • 2.f7#
      • 1...Kxh7!
    • 1.Qg2?
      • threat
        • 2.Qa8#
        • 2.Qg7#
        • 2.Qg8#
      • 1...Bxd7
        • 2.Qg7#
        • 2.Qg8#
      • 1...Be6
        • 2.Qg7#
      • 1...Be4
        • 2.Qg7#
        • 2.Qg8#
      • 1...Bg4
        • 2.Qa8#
      • 1...Bh7
        • 2.Qg7#
      • 1...Bg6!
  • Keys
    • 1.Bg8!
      • threat
        • 2.f7#
      • 1...Kxg8
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::QAB(A)+P(D)
  • Tries
    • Try
      • B(B);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR(A)
        • B(a);XR(E)::QAB(A)+P(D)
        • B(a);::QAB(A)+P(D)
      • Refutation
        • B(a);
    • Try
      • R(E);CHECK
      • Vars
        • B(a);SBLOCK,XR(E)::QAB(A)+P(D)
      • Refutation
        • K(b);P-FLIGHT,XR(E)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::QAB1(A)
      • Refutation
        • B(a);
  • Actual
    • B(B);
    • Threat
      • QAB(A)+P(D)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XB(B)::QAR(A)
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