MESON Chess Problem Database

Problem Display
PID: 146319 (8/3P2N1/2P1n3/4K3/7k/5Q2/8/8 w - - 0 1)

McDowell, Michael

Politika, 2011

(First published on Mon Oct 24 2011)

8/3P2N1/2P1n3/4K3/7k/5Q2/8/8

#2

5 + 2

56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Kg5
      • 2.Qh5#
    • 1...Sd4
      • 2.d8Q#
      • 2.d8B#
    • 1...Sf4
      • 2.d8Q#
      • 2.d8B#
    • 1...Sc5
      • 2.d8Q#
      • 2.d8B#
    • 1...Sg5
      • 2.Sf5#
    • 1...Sc7
      • 2.d8Q#
      • 2.d8B#
    • 1...Sxg7
      • 2.d8Q#
      • 2.d8B#
    • 1...Sf8
      • 2.d8Q#
      • 2.d8B#
  • Tries
    • 1.Qh3+?
      • 1...Kg5
        • 2.Qh5#
      • 1...Kxh3!
    • 1.d8Q+?
      • 1...Sg5
        • 2.Sf5#
      • 1...Sxd8!
    • 1.d8B+?
      • 1...Sg5
        • 2.Sf5#
      • 1...Sxd8!
  • Keys
    • 1.c7!
      • 1...Kg5
        • 2.Qh5#
      • 1...Sxc7
        • 2.d8Q#
        • 2.d8B#
      • 1...Sxg7
        • 2.d8Q#
        • 2.d8B#
      • 1...Sg5
        • 2.Sf5#
      • 1...Sd4
        • 2.d8Q#
        • 2.d8B#
      • 1...Sf4
        • 2.d8Q#
        • 2.d8B#
      • 1...Sc5
        • 2.d8Q#
        • 2.d8B#
      • 1...Sd8
        • 2.cxd8Q#
        • 2.cxd8B#
      • 1...Sf8
        • 2.d8Q#
        • 2.d8B#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(A)
    • S(b);N_GUARD::P=Q
    • S(b);SBLOCK::S(E)
    • S(b);N_GUARD,XS(E)::P=Q
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT,XQ(A)
    • Try
      • P(D);CHECK
      • Vars
        • S(b);P_SPINS(b)::S(E)
      • Refutation
        • S(b);XQ(D)
    • Try
      • P(D);CHECK
      • Vars
        • S(b);P_SPINS(b)::S(E)
      • Refutation
        • S(b);XB(D)
  • Actual
    • P(C);
    • Vars
      • K(a);S_FLIGHT::QAR1(A)
      • S(b);N_GUARD,XP(C)::P=Q
      • S(b);N_GUARD,XS(E)::P=Q
      • S(b);SBLOCK::S(E)
      • S(b);N_GUARD::P=Q
      • S(b);OGATE::PXS(b)=Q
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