MESON Chess Problem Database

Problem Display
PID: 214642 (5bK1/8/2R5/qkBN3Q/R7/8/3N2B1/4nr2 w - - 0 1)

Brock, David Thurston

Chicago Tribune, 1878

5bK1/8/2R5/qkBN3Q/R7/8/3N2B1/4nr2

#2

8 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Sxc3#
    • 1...Qb6
      • 2.Sc3#
    • 1...Qc7
      • 2.Sc3#
    • 1...Qd8
      • 2.Sc3#
    • 1...Qa6
      • 2.Sc3#
    • 1...Qa7
      • 2.Sc3#
    • 1...Qa8
      • 2.Sc3#
  • Tries
    • 1.Rb6+?
      • 1...Kxc5
        • 2.Sb3#
        • 2.Se4#
        • 2.Rc4#
      • 1...Qxb6
        • 2.Sc3#
      • 1...Kxa4!
  • Keys
    • 1.Ra6!
      • threat
        • 2.R4xa5#
      • 1...Kxa4
        • 2.Sc3#
        • 2.Qe8#
      • 1...Kxc5
        • 2.Sf4#
      • 1...Kxa6
        • 2.Sc7#
      • 1...Qxd2
        • 2.Sc7#
      • 1...Qxa4
        • 2.Sc7#
      • 1...Qxa6
        • 2.Sc3#
      • 1...Qc3
        • 2.Sxc3#
        • 2.Sc7#
      • 1...Qb4
        • 2.Sc7#
      • 1...Qb6
        • 2.Sc3#
      • 1...Qc7
        • 2.Sc3#
        • 2.Sxc7#
      • 1...Qd8
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::S(E),XQ(c)
    • Q(c);N_GUARD::S(E)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • Q(c);XR(G)::S(E)
      • Refutation
        • K(d);S_FLIGHT,XR(C)
  • Actual
    • R(G);
    • Threat
      • R1(C),XQ(c)
    • Vars
      • K(d);P-FLIGHT,XB(D)::QAR(F)+S(E)
      • K(d);P_SPINQ(c),S_FLIGHT,XR(G)::S(E)
      • Q(c);N_GUARD,XS(A)::S(E)
      • Q(c);N_GUARD,XR(C)::S(E)
      • Q(c);N_GUARD,XR(G)::S(E)
      • Q(c);N_GUARD::S(E)
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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).