MESON Chess Problem Database

Problem Display
PID: 148474 (5kNK/R4P1b/8/2pNpp2/2r5/7n/B2b2n1/B2R3Q w - - 0 1)

Boy, Claude

diagrammes, 1975

5kNK/R4P1b/8/2pNpp2/2r5/7n/B2b2n1/B2R3Q

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg8
      • 2.fxg8Q#
      • 2.fxg8R#
    • 1...Sf4
      • 2.Qh6#
    • 1...Sg5
      • 2.Qh6#
    • 1...e4
      • 2.Bg7#
  • Tries
    • 1.Sdf6?
      • threat
        • 2.Sxh7#
      • 1...Bxg8
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Rh4
        • 2.Sd7#
        • 2.Ra8#
      • 1...Sg5
        • 2.Qh6#
      • 1...Bg6!
    • 1.Bxe5?
      • threat
        • 2.Bd6#
        • 2.Bg7#
      • 1...Re4
        • 2.Bg7#
      • 1...Rg4
        • 2.Bd6#
      • 1...Bf4
        • 2.Bg7#
      • 1...Bg5
        • 2.Bg7#
      • 1...Bh6
        • 2.Bd6#
      • 1...Bc3!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Se6#
      • 1...Rxf4
        • 2.Ra8#
      • 1...Bxf4
        • 2.Rd8#
      • 1...Sgxf4
        • 2.Qa8#
      • 1...Shxf4
        • 2.Qh6#
      • 1...exf4
        • 2.Bg7#
      • 1...Sg5
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(h);OGATE,XS(H)::PXB(h)=Q
    • S(c);OGATE::QAB(C)
    • P(f);OGATE::B(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E),XB(h)
      • Vars
        • B(h);OGATE,XS(H)::PXB(h)=Q
        • S(c);OGATE::QAB(C)
      • Refutation
        • B(h);
    • Try
      • B(A);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(d);::B(A)
        • B(a);::B(A)
      • Refutation
        • B(a);P_PINB(A)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • R(d);XS(E)::R(F)
      • B(a);OGATE,XS(E)::R(B)
      • S(b);OGATE,XS(E)::QAR(C)
      • S(c);OGATE,XS(E)::QAB(C)
      • P(f);OGATE,XS(E)::B(A)
      • S(c);OGATE::QAB(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).