MESON Chess Problem Database

Problem Display
PID: 16077 (b5r1/N2N1pP1/1P1k4/3p2B1/3P4/3n3Q/3K3P/8 w - - 0 1)

Roosendaal, Jan C

Probleemblad, 2000

b5r1/N2N1pP1/1P1k4/3p2B1/3P4/3n3Q/3K3P/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rf8
      • 2.gxf8Q#
      • 2.gxf8B#
    • 1...Sc5
      • 2.dxc5#
    • 1...Se5
      • 2.dxe5#
  • Tries
    • 1.Se5?
      • threat
        • 2.Sxf7#
        • 2.Sb5#
        • 2.Qd7#
      • 1...Rxg7
        • 2.Sb5#
        • 2.Sc8#
        • 2.Qd7#
      • 1...f5
        • 2.Qh6#
      • 1...f6
        • 2.Qd7#
      • 1...Rd8
        • 2.Sxf7#
        • 2.Sb5#
      • 1...Rf8
        • 2.Sb5#
        • 2.Qd7#
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...Bc6
        • 2.Sxf7#
      • 1...Sc5
        • 2.Sxf7#
        • 2.Sb5#
      • 1...Sxe5!
  • Keys
    • 1.Sf8!
      • threat
        • 2.Qd7#
      • 1...Rxf8
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...Bc6
        • 2.Sc8#
      • 1...Sc5
        • 2.Qg3#
      • 1...Se5
        • 2.Qa3#
      • 1...f5
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(f);OGATE::PXR(f)=Q
    • S(a);OGATE::P(D),XS(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(3)
      • Vars
        • P(d);N_GUARD::QAR(C)
        • P(d);::QAR1(C)
        • B(e);::S(H),XP(d)
      • Refutation
        • S(a);XS(H)
  • Actual
    • S(H);
    • Threat
      • QAR1(C)
    • Vars
      • R(f);OGATE,XS(H)::PXR(f)=Q
      • B(e);SBLOCK::S(G)
      • S(a);N_GUARD::QAB(C)
      • S(a);OGATE::QAB(C)
      • P(d);N_GUARD::QAR(C)
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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).