MESON Chess Problem Database

Problem Display
PID: 51080 (5BBn/2p1N3/3rpp1P/3pk3/8/4P1N1/2Q2K2/8 w - - 0 1)

Downer, GR

Burnley Express, 1881

5BBn/2p1N3/3rpp1P/3pk3/8/4P1N1/2Q2K2/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6
      • 2.Sxc6#
    • 1...Rd7
      • 2.Sc6#
    • 1...Rd8
      • 2.Sc6#
    • 1...Sg6
      • 2.Sxg6#
    • 1...Sf7
      • 2.Sg6#
    • 1...d4
      • 2.Qe4#
    • 1...f5
      • 2.Bg7#
  • Tries
    • 1.Qa4?
      • threat
        • 2.Qd4#
        • 2.Qf4#
      • 1...Ra6
        • 2.Qf4#
      • 1...Rb6
        • 2.Qf4#
      • 1...Rc6
        • 2.Sxc6#
        • 2.Qf4#
      • 1...Rd7
        • 2.Sc6#
        • 2.Qf4#
      • 1...Rd8
        • 2.Sc6#
        • 2.Qf4#
      • 1...f5
        • 2.Bg7#
        • 2.Qd4#
      • 1...Sg6
        • 2.Sxg6#
        • 2.Qd4#
      • 1...c5
        • 2.Qf4#
      • 1...d4!
    • 1.Qxc7?
      • threat
        • 2.Sc6#
      • 1...f5
        • 2.Bg7#
      • 1...d4!
  • Keys
    • 1.Qc6!
      • 1...Rxc6
        • 2.Sxc6#
      • 1...f5
        • 2.Bg7#
      • 1...Rd7
        • 2.Qxe6#
      • 1...Rd8
        • 2.Qxe6#
      • 1...Sg6
        • 2.Sxg6#
      • 1...Sf7
        • 2.Sg6#
      • 1...d4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::S(F),XR(c)
    • R(c);N_GUARD::S(F)
    • S(g);N_GUARD::S(F),XS(g)
    • S(g);N_GUARD::S(F)
    • P(a);N_GUARD::QAR1(A)
    • P(e);OGATEB::B(G)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAB1(A)
        • P(f);::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);P_PINR(c),XP(f)
      • Threat
        • S(F)
      • Vars
        • P(e);OGATEB::B(G)
      • Refutation
        • P(a);
  • Actual
    • Q(A);
    • Vars
      • R(c);XQ(A)::S(F),XR(c)
      • P(e);OGATEB::B(G)
      • R(c);OGATE::QAR1(A),XP(d)
      • S(g);N_GUARD::S(F),XS(g)
      • S(g);N_GUARD::S(F)
      • P(a);OGATE::QAR1(A)
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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).