MESON Chess Problem Database

Problem Display
PID: 185189 (b2N4/8/1B1p4/Np1knp2/p2P1Rp1/8/1nPQ4/1R5K w - - 0 1)

Lyness, Robert Cranston

The Observer, 1930

(First published on Sun Sep 28 1930)

b2N4/8/1B1p4/Np1knp2/p2P1Rp1/8/1nPQ4/1R5K

#2

9 + 9

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Rxb5#
    • 1...Sbc4
      • 2.Rxb5#
    • 1...Sd3
      • 2.Qg2#
    • 1...Sec4
      • 2.Qg2#
    • 1...Sc6
      • 2.Qg2#
    • 1...Sg6
      • 2.Qg2#
    • 1...Sd7
      • 2.Qg2#
    • 1...Sf7
      • 2.Qg2#
  • Tries
    • 1.c4+?
      • 1...Sbxc4
        • 2.Rxb5#
      • 1...Sexc4
        • 2.Qg2#
      • 1...bxc4!
    • 1.dxe5+?
      • 1...Sd3
        • 2.Rxb5#
      • 1...Kxe5+!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Se3#
      • 1...Kxc4+
        • 2.d5#
      • 1...Sbxc4
        • 2.Rxb5#
      • 1...Sexc4
        • 2.Qg2#
      • 1...bxc4
        • 2.Qa5#
      • 1...Sd1
        • 2.dxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • S(a);OGATE::R(A),XP(d)
    • S(f);N_GUARD::QAB(D)
  • Tries
    • Try
      • P(C);CHECK
      • Vars
        • S(a);OGATE,XP(C)::R(A),XP(d)
        • S(f);XP(C)::QAB(D)
      • Refutation
        • P(d);XP(C)
    • Try
      • P(E);CHECK,XS(f)
      • Vars
        • S(a);OGATE,P_SPINS(a)::R(A),XP(d)
      • Refutation
        • K(e);CHECK,P-FLIGHT,XP(E)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(e);CHECK,OGATE,S_FLIGHT,XS(G)::R(F)+P(E)
      • S(a);OGATE,SBLOCK,XS(G)::R(A),XP(d)
      • S(f);N_GUARD,SBLOCK,XS(G)::QAB(D)
      • P(d);OGATEB,SBLOCK,XS(G)::QAR(D)
      • S(a);N_GUARD::QAR(D)+P(E),XS(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).