MESON Chess Problem Database

Problem Display
PID: 152802 (k3B3/1pK5/1P6/1P1b4/8/5n2/5Q2/8 w - - 0 1)

Harley, Brian

The Observer, 1934

(First published on Sun Jan 7 1934)

k3B3/1pK5/1P6/1P1b4/8/5n2/5Q2/8

#2

5 + 4

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Qxa2#
    • 1...Be4
      • 2.Qa2#
    • 1...Bc6
      • 2.Qa2#
  • Tries
    • 1.Qd4?
      • threat
        • 2.Qa4#
      • 1...Bb3
        • 2.Qd8#
      • 1...Bc4
        • 2.Qd8#
      • 1...Sxd4!
    • 1.Qh4?
      • threat
        • 2.Qd8#
        • 2.Qa4#
      • 1...Bb3
        • 2.Qd8#
      • 1...Bc4
        • 2.Qd8#
      • 1...Be4
        • 2.Qd8#
      • 1...Be6
        • 2.Qa4#
      • 1...Sd4
        • 2.Qd8#
      • 1...Sg5
        • 2.Qa4#
      • 1...Sxh4!
    • 1.Qxf3?
      • threat
        • 2.Qa3#
      • 1...Bb3
        • 2.Qxb7#
      • 1...Bxf3!
  • Keys
    • 1.Bc6!
      • 1...Bxc6
        • 2.Qa2#
      • 1...bxc6
        • 2.b7#
      • 1...Ba2
        • 2.Bxb7#
        • 2.Qxa2#
      • 1...Bb3
        • 2.Bxb7#
      • 1...Bc4
        • 2.Bxb7#
      • 1...Be4
        • 2.Qa2#
      • 1...Be6
        • 2.Bxb7#
      • 1...Bf7
        • 2.Bxb7#
      • 1...Bg8
        • 2.Bxb7#
      • 1...Se1
        • 2.Qf8#
      • 1...Sg1
        • 2.Qf8#
      • 1...Sd2
        • 2.Qf8#
      • 1...Sh2
        • 2.Qf8#
      • 1...Sd4
        • 2.Qf8#
      • 1...Sh4
        • 2.Qf8#
      • 1...Se5
        • 2.Qf8#
      • 1...Sg5
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 1
  • Sets
    • B(b);N_GUARD::QAR(A),XB(b)
    • B(b);N_GUARD::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • B(b);OGATE::QAR(A)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAR(A)
        • S(a);::QAR(A)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);XS(a)
      • Threat
        • QAR(A)
      • Vars
        • B(b);OGATE,P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • B(b);XQ(A)
  • Actual
    • B(E);P_PINP(c)
    • Vars
      • B(b);N_GUARD,N_SPINP(c),XB(E)::QAR(A)
      • P(c);N_SPINP(c),OGATE,XB(E)::P(C)
      • B(b);N_GUARD::B(E),XP(c)
      • B(b);N_GUARD::QAR(A)
      • S(a);OGATE::QAR(A)
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