MESON Chess Problem Database

Problem Display
PID: 269824 (8/brp1N3/b3N1p1/6p1/R2pkP2/2BR1q1B/1pQp2r1/1Kn5 w - - 0 1)

Clark, Cecil Henry Douglas

The Observer, 1958

(First published on Sun Jun 22 1958)

8/brp1N3/b3N1p1/6p1/R2pkP2/2BR1q1B/1pQp2r1/1Kn5

#2

9 + 13

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Raxd4#
    • 1...Bb8
      • 2.Raxd4#
  • Keys
    • 1.Bxd4!
      • threat
        • 2.Re3#
      • 1...Qxd3
        • 2.Bxg2#
      • 1...Bxd3
        • 2.Bb6#
      • 1...Bxd4
        • 2.Raxd4#
      • 1...Sxd3
        • 2.Qc6#
      • 1...Qe3
        • 2.Rxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(l);S_CUTB(k)::R1(F),XP(f)
    • B(k);N_GUARD::R1(F),XP(f)
  • Actual
    • B(C);XP(f)
    • Threat
      • QAB(B)+R(D),DCHECK
    • Vars
      • Q(e);OGATEB,P_PINQ(B),P_SPINQ(e),XR(D)::B(E),XR(d)
      • B(i);N_GUARD,P_PINQ(B),P_SPINB(i),XR(D)::R(F)+B(C)
      • B(k);OGATE,P_SPINB(k),XB(C)::R1(F),XB(k)
      • S(a);P_SPINS(a),SBLOCK,XR(D)::QAB(B)
      • Q(e);::QAB(B)+R(D),DCHECK,XQ(e)
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).