MESON Chess Problem Database

Problem Display
PID: 59562 (5R1q/n7/K3Qrb1/1pN3b1/7p/4pk1B/4p1N1/4B3 w - - 0 1)

O'Keefe, John James

4th Prize, Good Companions (December), 1919

5R1q/n7/K3Qrb1/1pN3b1/7p/4pk1B/4p1N1/4B3

#2

7 + 10

3132 The Good Companion Two-Mover 1922
56 The Problemist 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Qg4#
      • 2.Qxe3#
    • 1...Rf5
      • 2.Qd5#
      • 2.Qe4#
    • 1...Rf7
      • 2.Qg4#
    • 1...Rxf8
      • 2.Qg4#
    • 1...Sc6
      • 2.Qg4#
  • Tries
    • 1.Rxf6+?
      • 1...Bf4
        • 2.Rxf4#
        • 2.Qg4#
        • 2.Qxe3#
      • 1...Bxf6
        • 2.Qg4#
        • 2.Qxe3#
      • 1...Bf5
        • 2.Qd5#
        • 2.Qe4#
      • 1...Qxf6!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Sd4#
      • 1...Rxf8
        • 2.Qg4#
      • 1...Rf4
        • 2.Qxe3#
      • 1...Rf5
        • 2.Qd5#
      • 1...Rf7
        • 2.Qg4#
      • 1...Sc6
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(g);N_PINQ(F)::QAB1(F)
    • R(g);N_PINQ(F),N_SPINR(g),XR(G)::QAB1(F)
    • S(i);N_PINQ(F)::QAB1(F)
  • Tries
    • Try
      • R(G);CHECK,N_SPINQ(F),XR(g)
      • Refutation
        • Q(j);P_PINQ(F),XR(G)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • R(g);N_PINQ(F),N_SPINR(g),XR(G)::QAB1(F)
      • R(g);N_PINQ(F)::QAR1(F),XP(b)
      • R(g);N_PINQ(F)::QAB(F)
      • R(g);N_PINQ(F)::QAB1(F)
      • S(i);N_PINQ(F)::QAB1(F)
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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).