MESON Chess Problem Database

Problem Display
PID: 249138 (8/3K2Q1/7n/1pp1N3/3k4/n1N1qP2/4P3/2R3B1 w - - 0 1)

Barnes, Barry Peter

The Problemist, 1990

8/3K2Q1/7n/1pp1N3/3k4/n1N1qP2/4P3/2R3B1

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Bxf2#
    • 1...Sc4
      • 2.Sc6#
    • 1...c4
      • 2.Sd3#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Bxe3#
        • 2.Qxe3#
        • 2.Qf4#
      • 1...Qxg1
        • 2.Qf4#
      • 1...Sf5
        • 2.Qf4#
      • 1...c4
        • 2.Sc6#
        • 2.Bxe3#
        • 2.Qxe3#
      • 1...Qf2
        • 2.Bxf2#
        • 2.Qf4#
      • 1...Sc4
        • 2.Sc6#
        • 2.Qf4#
      • 1...Sg4
        • 2.Qf4#
      • 1...Sc2!
  • Keys
    • 1.Ke6!
      • threat
        • 2.Qd7#
      • 1...Qxg1
        • 2.Qxg1#
      • 1...Qf2
        • 2.Bxf2#
      • 1...Sc2
        • 2.Sxb5#
      • 1...c4
        • 2.Qa7#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sf5
        • 2.Qg4#
      • 1...Sf7
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(b);OGATEB::B(B),XQ(b)
    • S(a);SBLOCK::QAB(H)+S(F),DCHECK
    • P(e);SBLOCK::QAB(H)+S(F)
  • Tries
    • Try
      • Q(H);
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);N_SPINQ(b),XB(B)::QAR2(H)
        • S(f);::QAR2(H)
      • Refutation
        • S(a);
  • Actual
    • K(G);P_SPINS(F),S_FLIGHT
    • Threat
      • QAR(H)
    • Vars
      • Q(b);N_PINS(F),N_SPINQ(b),OGATE,XB(B)::QAB(H),XQ(b)
      • Q(b);N_PINS(F),OGATEB::B(B),XQ(b)
      • S(a);N_GUARD::S(D),XP(d)
      • P(e);OGATEB::QAB(H)
      • S(f);N_GUARD::QAR(H)
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Developed and maintained by Brian Stephenson.
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