MESON Chess Problem Database

Problem Display
PID: 232371 (8/2K5/kB3Q2/8/2P5/2n5/8/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1978

8/2K5/kB3Q2/8/2P5/2n5/8/8

#2

4 + 2

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qa1#
    • 1...Se2
      • 2.Qa1#
    • 1...Se4
      • 2.Qa1#
  • Tries
    • 1.Qe5?
      • threat
        • 2.Qa5#
      • 1...Sb5+
        • 2.Qxb5#
        • 2.cxb5#
      • 1...Sd5+!
    • 1.Qg5?
      • threat
        • 2.Qa5#
      • 1...Sb5+
        • 2.Qxb5#
        • 2.cxb5#
      • 1...Sd5+!
    • 1.Qf5?
      • threat
        • 2.Qc8#
        • 2.Qa5#
      • 1...Sb5+
        • 2.Qxb5#
        • 2.cxb5#
      • 1...Sd5+!
    • 1.Qc6?
      • threat
        • 2.Qb7#
        • 2.Qa8#
      • 1...Sb5+
        • 2.Qxb5#
        • 2.cxb5#
      • 1...Sd5+!
  • Keys
    • 1.Qf1!
      • 1...Sb5+
        • 2.cxb5#
      • 1...Sd5+
        • 2.cxd5#
      • 1...Sb1
        • 2.c5#
      • 1...Sd1
        • 2.c5#
      • 1...Sa2
        • 2.c5#
      • 1...Se2
        • 2.Qa1#
      • 1...Sa4
        • 2.c5#
      • 1...Se4
        • 2.Qa1#
        • 2.c5#

Anticipated by 213223(1971)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::QAR(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);CHECK
  • Actual
    • Q(C);
    • Vars
      • S(a);CHECK,OGATE::P(A),XS(a)
      • S(a);CHECK,OGATE::QAB(C)+P(A),XS(a)
      • S(a);N_GUARD::QAB(C)+P(A)
      • S(a);N_GUARD::QAR(C)
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