MESON Chess Problem Database

Problem Display
PID: 189541 (8/6N1/8/2QNkB2/8/3pP3/4nK2/4R3 w - - 0 1)

van Dijk, Johannes

De Schaakcourant, 1911

8/6N1/8/2QNkB2/8/3pP3/4nK2/4R3

#2

7 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.exd4#
    • 1...Sf4
      • 2.exf4#
  • Tries
    • 1.Sh5?
      • threat
        • 2.Sc3#
        • 2.Sb4#
        • 2.Sdf4#
        • 2.Sb6#
        • 2.Sdf6#
        • 2.Sc7#
        • 2.Se7#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sf4
        • 2.Sdxf4#
      • 1...Kxf5!
    • 1.Se8?
      • threat
        • 2.Sc3#
        • 2.Sb4#
        • 2.Sf4#
        • 2.Sb6#
        • 2.Sdf6#
        • 2.Sdc7#
        • 2.Se7#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sf4
        • 2.Sxf4#
      • 1...Kxf5!
  • Keys
    • 1.Be4!
      • threat
        • 2.Qe7#
      • 1...Kxe4
        • 2.Sf6#
      • 1...Sd4
        • 2.exd4#
      • 1...Sf4
        • 2.exf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE::R(A)+P(C)DCHECK,XS(a)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(7)
      • Vars
        • S(a);::QAR(D)+S(E),XS(a)
      • Refutation
        • K(c);P-FLIGHT,XB(F)
    • Try
      • S(G);
      • Threat
        • DUALS(7)
      • Vars
        • S(a);::QAR(D)+S(E),XS(a)
      • Refutation
        • K(c);P-FLIGHT,XB(F)
  • Actual
    • B(F);
    • Threat
      • QAR2(D)
    • Vars
      • K(c);P-FLIGHT,XB(F)::S(E)
      • S(a);OGATE::P(C),XS(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).