MESON Chess Problem Database

Problem Display
PID: 153711 (8/8/8/5Q2/6p1/6K1/3p4/4kB2 w - - 0 1)

Harley, Brian

The Observer, 1947

(First published on Sun May 4 1947)

8/8/8/5Q2/6p1/6K1/3p4/4kB2

#2

3 + 3

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2019
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd1
      • 2.Qb1#
    • 1...d1Q
      • 2.Qf2#
    • 1...d1B
      • 2.Qf2#
    • 1...d1R
      • 2.Qf2#
  • Tries
    • 1.Bd3?
      • threat
        • 2.Qf1#
      • 1...Kd1
        • 2.Qf1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
        • 2.Qa5#
      • 1...d1R
        • 2.Qf2#
      • 1...d1S!
    • 1.Bc4?
      • threat
        • 2.Qf1#
      • 1...Kd1
        • 2.Qb1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
        • 2.Qa5#
      • 1...d1R
        • 2.Qf2#
      • 1...d1S!
    • 1.Bb5?
      • threat
        • 2.Qf1#
      • 1...Kd1
        • 2.Qb1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
      • 1...d1R
        • 2.Qf2#
      • 1...d1S!
    • 1.Ba6?
      • threat
        • 2.Qf1#
      • 1...Kd1
        • 2.Qb1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
        • 2.Qa5#
      • 1...d1R
        • 2.Qf2#
      • 1...d1S!
    • 1.Qe4+?
      • 1...Kd1
        • 2.Qb1#
      • 1...Kxf1!
    • 1.Qf3?
      • threat
        • 2.Qe2#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
      • 1...gxf3!
  • Keys
    • 1.Qc2!
      • 1...Kxf1
        • 2.Qd1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1S
        • 2.Qe2#
      • 1...d1B
        • 2.Qf2#
      • 1...d1R
        • 2.Qe2#
        • 2.Qf2#

This anticipates 15681(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT::QAR2(C)
    • P(b);SBLOCK::QAB1(C)
  • Tries
    • Try
      • B(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • B(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • B(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • B(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT,XB(A)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT,XB(A)::QAR2(C)
      • P(b);OGATE,SBLOCK::QAB1(C)
      • P(b);OGATE::QAR1(C)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).