MESON Chess Problem Database

Problem Display
PID: 236203 (3n2B1/5q2/5N2/4k1pR/4N3/6P1/5QK1/6B1 w - - 0 1)

Frey, Andre

Schweizerische Schachzeitung, 1988

3n2B1/5q2/5N2/4k1pR/4N3/6P1/5QK1/6B1

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Rxg5#
    • 1...Qb3
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qc4
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qd5
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qxh5
      • 2.Qc5#
    • 1...Qe6
      • 2.Qf4#
    • 1...Qg6
      • 2.Qc5#
      • 2.Qf4#
    • 1...Qe8
      • 2.Rxg5#
      • 2.Qc5#
      • 2.Qf4#
    • 1...Qa7
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qb7
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qc7
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qd7
      • 2.Qf4#
    • 1...Qe7
      • 2.Rxg5#
      • 2.Qf4#
    • 1...Qg7
      • 2.Qc5#
      • 2.Qf4#
    • 1...Qh7
      • 2.Qc5#
      • 2.Qf4#
    • 1...Qf8
      • 2.Rxg5#
      • 2.Qf4#
  • Tries
    • 1.Qc5+?
      • 1...Qd5
        • 2.Rxg5#
        • 2.Qxd5#
      • 1...Ke6!
  • Keys
    • 1.Sxg5!
      • threat
        • 2.Qf4#
      • 1...Qd5+
        • 2.Sge4#
      • 1...Qb7+
        • 2.Sge4#
      • 1...Kd6
        • 2.Qc5#
      • 1...Qxf6
        • 2.Qc5#
      • 1...Qa2
        • 2.Sge4#
      • 1...Qc4
        • 2.Sge4#
      • 1...Se6
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(c);P_PINQ(B)::R(F),XP(b)
    • Q(c);N_GUARD,N_SPINP(b),XR(F)::QAR2(B)
    • Q(c);::QAB1(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,P_SPINQ(c)
  • Actual
    • S(E);XP(b)
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);CHECK,N_GUARD::R(F)+S(E)
      • K(a);S_FLIGHT::QAB1(B)
      • Q(c);N_GUARD,SBLOCK,XS(G)::QAR2(B)
      • Q(c);N_GUARD,P_PINQ(B)::R(F)+S(E)
      • Q(c);N_GUARD::R(F)+S(E)
      • S(d);SBLOCK::R(F)+S(E),DCHECK,XQ(c)
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