MESON Chess Problem Database

Problem Display
PID: 185707 (1B2R2Q/2pp1Kp1/4p3/nRNPk3/3pN2n/3P1PP1/8/b7 w - - 0 1)

Ling, John Francis

Chess, 1957

1B2R2Q/2pp1Kp1/4p3/nRNPk3/3pN2n/3P1PP1/8/b7

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Sxd7#
    • 1...Sg6
      • 2.Qh5#
  • Tries
    • 1.Qxg7+?
      • 1...Kf5
        • 2.Qf6#
        • 2.Qg5#
      • 1...Kxd5!
    • 1.Qxh4?
      • threat
        • 2.Qg5#
      • 1...Kf5
        • 2.Qg5#
        • 2.Qf4#
      • 1...g5
        • 2.Qxg5#
      • 1...Kxd5!
    • 1.Qh5+?
      • 1...Sf5
        • 2.Sxd7#
      • 1...g5!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Sxg7#
      • 1...Kf5
        • 2.Sxg7#
      • 1...dxe6
        • 2.dxe6#
      • 1...Sf5
        • 2.f4#
      • 1...Sg6
        • 2.Qh5#
      • 1...Sc6
        • 2.d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::S(F),XP(h)
    • S(c);N_GUARD,S_CUTP(i)::QAR(K)
  • Tries
    • Try
      • Q(K);CHECK,XP(i)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XP(G)
    • Try
      • Q(K);XS(c)
      • Threat
        • QAR2(K)
      • Vars
        • P(i);::QAR2(K),XP(i)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XP(G)
    • Try
      • Q(K);CHECK
      • Vars
        • S(c);P_SPINS(c)::S(F),XP(h)
      • Refutation
        • P(i);N_SPINP(f),P_SPINP(i)
  • Actual
    • S(F);P_PINP(g),XP(f)
    • Threat
      • R(J)+S(F),XP(i)
    • Vars
      • K(e);N_SPINP(g),P-FLIGHT::S(F),XP(i)
      • P(h);N_SPINP(g),OGATE,P_SPINP(h),XS(F)::R(E)+P(G),XP(h)
      • S(c);SBLOCK::P(B)
      • S(c);N_GUARD,S_CUTP(i)::QAR(K)
      • S(d);::R(E)+P(G)
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Developed and maintained by Brian Stephenson.
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