MESON Chess Problem Database

Problem Display
PID: 232334 (B7/qN6/8/2B2K2/8/8/3Q4/7k w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1972

B7/qN6/8/2B2K2/8/8/3Q4/7k

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sa5#
    • 1...Qa5
      • 2.Sxa5#
    • 1...Qxb7
      • 2.Bxb7#
  • Tries
    • 1.Sa5+?
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxa8!
    • 1.Sd6+?
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxa8!
    • 1.Sd8+?
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxa8!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qg1#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Qa1
        • 2.Sa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_GUARD,SBLOCK::B(E)+S(D)
    • Q(b);N_GUARD,P_PINB(B)::B(E)+S(D),XQ(b)
    • Q(b);OGATE,P_SPINQ(b),XS(D)::B(E),XQ(b)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(E),XQ(b)
      • Refutation
        • Q(b);XB(E)
    • Try
      • S(D);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(E),XQ(b)
      • Refutation
        • Q(b);XB(E)
    • Try
      • S(D);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(E),XQ(b)
      • Refutation
        • Q(b);XB(E)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • Q(b);CHECK,XB(B)::B(E)+S(D),XQ(b)
      • Q(b);N_GUARD,SBLOCK::B(E)+S(D)
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