MESON Chess Problem Database

Problem Display
PID: 6799 (QR6/3Pk2K/3r2P1/3P4/5P2/8/8/8 w - - 0 1)

Harley, Brian

Social Chess Quarterly (The), 1933

QR6/3Pk2K/3r2P1/3P4/5P2/8/8/8

#2

7 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd7
      • 2.Rb7#
      • 2.Qb7#
      • 2.Qa7#
    • 1...Ra6
      • 2.d8Q#
    • 1...Rb6
      • 2.d8Q#
    • 1...Rc6
      • 2.d8Q#
    • 1...Re6
      • 2.d8Q#
    • 1...Rf6
      • 2.d8Q#
  • Tries
    • 1.Re8+?
      • 1...Kxd7
        • 2.Qc8#
        • 2.Qd8#
      • 1...Kf6!
    • 1.Qa3?
      • threat
        • 2.d8Q#
      • 1...Kxd7
        • 2.Qa7#
      • 1...Kf6!
  • Keys
    • 1.Rb6!
      • 1...Kf6
        • 2.Qf8#
      • 1...Kxd7
        • 2.Rb7#
      • 1...Rxd5
        • 2.Qe8#
      • 1...Rxb6
        • 2.d8Q#
      • 1...Rxg6
        • 2.Qe8#
      • 1...Rxd7
        • 2.Re6#
      • 1...Rc6
        • 2.d8Q#
      • 1...Re6
        • 2.d8Q#
      • 1...Rf6
        • 2.Qe8#
        • 2.d8Q#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::P=Q
    • R(a);N_GUARD,SBLOCK::P=Q
  • Tries
    • Try
      • R(G);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);P_PINR(a)
      • Threat
        • P=Q
      • Vars
        • K(b);N_SPINR(a),OGATEB,P-FLIGHT,XP(D)::QAR(F)
      • Refutation
        • K(b);N_SPINR(a),S_FLIGHT
  • Actual
    • R(G);
    • Vars
      • K(b);P_SPINR(a),S_FLIGHT::QAR2(F)
      • K(b);OGATEB,P-FLIGHT,XP(D)::R(G)
      • R(a);XP(B)::QAR1(F)
      • R(a);N_GUARD,XR(G)::P=Q
      • R(a);XP(C)::QAR1(F)
      • R(a);OGATE,SBLOCK,XP(D)::R1(G)
      • R(a);N_GUARD::P=Q
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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).