MESON Chess Problem Database

Problem Display
PID: 161376 (6q1/n1pN4/k1B3Q1/8/1P1B4/3P4/p7/K7 w - - 0 1)

Shaw, EH

The Observer, 1922

(First published on Sun Dec 24 1922)

6q1/n1pN4/k1B3Q1/8/1P1B4/3P4/p7/K7

#2

7 + 5

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Sb8#
    • 1...Qc4
      • 2.Sb8#
    • 1...Qd5
      • 2.Sb8#
    • 1...Qe6
      • 2.Sb8#
    • 1...Qf7
      • 2.Sb8#
    • 1...Qh7
      • 2.Sb8#
    • 1...Qxg6
      • 2.Sb8#
    • 1...Qg7
      • 2.Sb8#
    • 1...Qb8
      • 2.Sxb8#
    • 1...Sxc6
      • 2.Qxc6#
    • 1...Sc8
      • 2.Sb8#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qa5#
      • 1...Qxg5
        • 2.Sb8#
      • 1...Qd5
        • 2.Sb8#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Sxc6!
    • 1.Qxg8?
      • threat
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Sb5
        • 2.Sb8#
        • 2.Qc8#
      • 1...Sxc6!
  • Keys
    • 1.Qg2!
      • 1...Qxg2
        • 2.Sb8#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Qe6
        • 2.Sb8#
      • 1...Qb3
        • 2.Sb8#
      • 1...Qc4
        • 2.Sb8#
      • 1...Qd5
        • 2.Sb8#
      • 1...Qf7
        • 2.Sb8#
      • 1...Qh7
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Qg3
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Qg4
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Qg5
        • 2.Sb8#
      • 1...Qg6
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Qg7
        • 2.Sb8#
        • 2.Qxa2#
      • 1...Qa8
        • 2.Qxa2#
      • 1...Qb8
        • 2.Sxb8#
        • 2.Qxa2#
      • 1...Qc8
        • 2.Qxa2#
      • 1...Qd8
        • 2.Qxa2#
      • 1...Qe8
        • 2.Qxa2#
      • 1...Qf8
        • 2.Qxa2#
      • 1...Qh8
        • 2.Qxa2#
      • 1...Sb5
        • 2.Bb7#
      • 1...Sc8
        • 2.Sb8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 4
  • Sets
    • Q(e);N_GUARD::S(G)
    • Q(e);N_GUARD,XQ(F)::S(G)
    • Q(e);N_GUARD,P_PINB(D)::S(G)
    • Q(e);N_GUARD::S(G),XQ(e)
    • S(c);OGATE,P_SPINS(c),XB(E)::QAR2(F),XS(c)
    • S(c);S_CUTQ(e)::S(G)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • Q(e);N_GUARD,XQ(F)::S(G)
        • Q(e);N_GUARD::S(G)
        • S(c);N_GUARD::QAB1(F),XS(c)
      • Refutation
        • S(c);XB(E)
    • Try
      • Q(F);XQ(e)
      • Threat
        • DUALS(2)
      • Refutation
        • S(c);XB(E)
  • Actual
    • Q(F);
    • Vars
      • Q(e);N_GUARD,XQ(F)::S(G)
      • S(c);OGATE,XB(E)::QAR2(F),XS(c)
      • Q(e);N_GUARD::S(G)
      • Q(e);N_GUARD::QAR(F),XP(a)
      • Q(e);N_GUARD,P_PINB(D)::QAR(F),XP(a)
      • S(c);SBLOCK::B(E)
      • S(c);S_CUTQ(e)::S(G)
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