MESON Chess Problem Database

Problem Display
PID: 1136 (B4R2/br3N1K/3pp3/8/2P1knQ1/3Rq2p/2P1pp2/5N2 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1980

B4R2/br3N1K/3pp3/8/2P1knQ1/3Rq2p/2P1pp2/5N2

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sg3#
    • 1...Qd2
      • 2.Sxd2#
      • 2.Sg3#
    • 1...Qd4
      • 2.Sd2#
      • 2.Sg3#
    • 1...Qc5
      • 2.Sd2#
      • 2.Sg3#
    • 1...Qb6
      • 2.Sd2#
      • 2.Sg3#
    • 1...Qf3
      • 2.Sd2#
    • 1...Qg3
      • 2.Sd2#
      • 2.Sxg3#
  • Tries
    • 1.Qg6+?
      • 1...Kf3
        • 2.Sd2#
        • 2.Sh2#
      • 1...Sxg6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Sg5#
      • 1...Kf3
        • 2.Sd2#
      • 1...Kf5
        • 2.Sxd6#
      • 1...Sxd3
        • 2.Sxd6#
      • 1...Sg2
        • 2.Sxd6#
      • 1...Sd5
        • 2.Sxd6#
      • 1...Sh5
        • 2.Sxd6#
      • 1...Sg6
        • 2.Sxd6#
      • 1...Qc5
        • 2.Sg3#
      • 1...Qg3
        • 2.Sxg3#
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_GUARD::S(A)
  • Tries
    • Try
      • Q(E);CHECK,N_PINS(f)
      • Refutation
        • S(f);XQ(E)
  • Actual
    • Q(E);N_PINS(f),N_SPINS(F)
    • Threat
      • S(F)
    • Vars
      • K(e);P_SPINQ(c),S_FLIGHT::S(A)
      • K(e);N_SPINR(j),S_FLIGHT::R(I)+S(F),DCHECK,XP(g)
      • S(f);XR(C)::S(F),XP(g)
      • S(f);::S(F),XP(g)
      • S(f);N_SPINR(j)::S(F),XP(g)
      • Q(c);N_GUARD::S(A)
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Developed and maintained by Brian Stephenson.
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