MESON Chess Problem Database

Problem Display
PID: 153689 (8/K7/8/1N5Q/kpn5/PN6/2P5/8 w - - 0 1)

Harley, Brian

The Observer, 1947

(First published on Sun Jan 5 1947)

8/K7/8/1N5Q/kpn5/PN6/2P5/8

#2

6 + 3

15290 Harley Scrapbook 2015
3713 Snap 2015
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qh4?
      • 1...Sxa3
        • 2.Sc3#
      • 1...bxa3
        • 2.Qxc4#
      • 1...Se5
        • 2.Qxb4#
      • 1...Sb2
        • 2.Qxb4#
      • 1...Sd2
        • 2.Qxb4#
      • 1...Se3
        • 2.Qxb4#
      • 1...Sa5
        • 2.Qxb4#
      • 1...Sb6
        • 2.Qxb4#
      • 1...Sd6
        • 2.Qxb4#
      • 1...Kxb5!
    • 1.Qc5?
      • threat
        • 2.Qxb4#
      • 1...bxa3
        • 2.Sc3#
        • 2.Qxc4#
      • 1...Sxa3!
  • Keys
    • 1.Qg4!
      • 1...Kxb5
        • 2.Qd7#
      • 1...Sxa3
        • 2.Sc3#
      • 1...bxa3
        • 2.Qxc4#
      • 1...Se5
        • 2.Qxb4#
      • 1...Sb2
        • 2.Qxb4#
      • 1...Sd2
        • 2.Qxb4#
      • 1...Se3
        • 2.Qxb4#
      • 1...Sa5
        • 2.Qxb4#
      • 1...Sb6
        • 2.Qxb4#
      • 1...Sd6
        • 2.Qxb4#

This anticipates 73036(1993)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);
      • Vars
        • S(c);P_SPINP(b),SBLOCK,XP(B)::S(D)
        • P(b);OGATEB,P_SPINS(c),XP(B)::QAR2(E),XS(c)
        • S(c);OGATE,P_SPINP(b)::QAR1(E),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XS(D)
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(b)
      • Refutation
        • S(c);XP(B)
  • Actual
    • Q(E);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(D)::QAB(E)
      • S(c);P_SPINP(b),SBLOCK,XP(B)::S(D)
      • P(b);OGATEB,P_SPINS(c),XP(B)::QAR2(E),XS(c)
      • S(c);OGATE,P_SPINP(b)::QAR1(E),XP(b)
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