MESON Chess Problem Database

Problem Display
PID: 232346 (4B3/1pQ5/8/1q6/k7/3N4/2K5/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1975

4B3/1pQ5/8/1q6/k7/3N4/2K5/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...b6
      • 2.Qa7#
  • Tries
    • 1.Sb2+?
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka3!
    • 1.Bxb5+?
      • 1...Ka3
        • 2.Qa5#
      • 1...Kxb5!
    • 1.Qc3?
      • threat
        • 2.Sb2#
        • 2.Sc5#
        • 2.Qa1#
        • 2.Qb4#
      • 1...Qxe8
        • 2.Qb4#
      • 1...Qd7
        • 2.Qb4#
      • 1...b6
        • 2.Sb2#
        • 2.Qa1#
        • 2.Qb4#
      • 1...Qc6!
    • 1.Qc4+?
      • 1...Ka5
        • 2.Qxb5#
      • 1...Ka3!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qb4#
        • 2.Qa7#
      • 1...Ka5
        • 2.Qxb5#
      • 1...Qxe8
        • 2.Sb2#
        • 2.Qb4#
      • 1...Qc6
        • 2.Sb2#
      • 1...Qd7
        • 2.Sb2#
        • 2.Qb4#
      • 1...b6
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE::QAR(C)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(a);N_SPINQ(b),P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);N_SPINQ(b),P-FLIGHT
    • Try
      • B(D);CHECK,XQ(b)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT,XB(D)
    • Try
      • Q(C);
      • Threat
        • DUALS(4)
      • Vars
        • Q(b);N_SPINQ(b),XB(D)::QAR1(C)
        • Q(b);::QAR1(C)
      • Refutation
        • Q(b);P_PINQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);N_SPINQ(b),P-FLIGHT::QAR1(C),XQ(b)
      • Refutation
        • K(a);N_SPINQ(b),P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • K(a);P-FLIGHT::QAR1(C),XQ(b)
      • Q(b);P_PINQ(C)::S(B)
      • P(c);::QAR1(C)
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Developed and maintained by Brian Stephenson.
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