MESON Chess Problem Database

Problem Display
PID: 153795 (8/8/6K1/B7/6B1/8/2P1RPP1/1brk2r1 w - - 0 1)

Harley, Brian

The Observer, 1949

(First published on Sun May 1 1949)

8/8/6K1/B7/6B1/8/2P1RPP1/1brk2r1

#2

7 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Re1#
    • 1...Re1
      • 2.Rd2#
    • 1...Bxc2+
      • 2.Re4#
  • Keys
    • 1.f4!
      • threat
        • 2.Rf2#
      • 1...Bxc2+
        • 2.Re4#
      • 1...Rxc2
        • 2.Re1#
      • 1...Rxg2
        • 2.Rxg2#
      • 1...Re1
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK,XP(A)::B(E)+R(B),DCHECK
    • R(d);SBLOCK::B(E)+R(B),DCHECK
    • B(a);CHECK,SBLOCK,XP(A)::B(E)+R(B)
  • Actual
    • P(C);
    • Threat
      • B(E)+R(B)
    • Vars
      • B(a);CHECK,SBLOCK,XP(A)::B(E)+R(B)
      • R(b);SBLOCK,XP(A)::B(E)+R(B),DCHECK
      • R(d);OGATE,P_PINB(E),XP(D)::B(E)+R(B),XR(d)
      • R(d);SBLOCK::B(E)+R(B),DCHECK
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).