MESON Chess Problem Database

Problem Display
PID: 199961 (1b6/1R6/2B5/3NpN2/pPk1pp2/prn4K/4P3/qbQ1B3 w - - 0 1)

Swords, WJ

The Observer, 1946

(First published on Sun Nov 24 1946)

1b6/1R6/2B5/3NpN2/pPk1pp2/prn4K/4P3/qbQ1B3

#2

9 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Qxc3#
    • 1...f3
      • 2.Sde3#
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qc5#
      • 1...Rxb4
        • 2.Rxb4#
      • 1...Sxe2
        • 2.Sb6#
      • 1...Sxd5
        • 2.Bb5#
      • 1...fxe3
        • 2.Sdxe3#
      • 1...Rb2
        • 2.Qxc3#
      • 1...Bd6
        • 2.Sxd6#
      • 1...Ba7
        • 2.Sd6#
      • 1...Sd1
        • 2.Sb6#
      • 1...Sa2
        • 2.Sb6#
      • 1...Sb5
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • R(d);N_GUARD,S_CUTQ(a)::QAR1(A),XS(e)
    • P(i);N_GUARD::S(F)
  • Actual
    • Q(A);N_PINS(e)
    • Threat
      • QAR1(A)
    • Vars
      • R(d);OGATE,XP(E)::R1(I),XR(d)
      • S(e);P_PINQ(A),XP(C)::S(F)
      • S(e);N_GUARD,P_PINQ(A),SBLOCK,XS(F)::B(H)
      • P(i);XQ(A)::S(F),XP(i)
      • R(d);N_GUARD,S_CUTQ(a)::QAR1(A),XS(e)
      • B(k);N_GUARD::S(G),XB(k)
      • B(k);N_GUARD::S(G)
      • S(e);P_PINQ(A)::S(F)
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).