MESON Chess Problem Database

Problem Display
PID: 210251 (8/rb3Q1p/1b1B1N1K/2n2k2/2r4p/1qp4P/1pn4N/1B6 w - - 0 1)

Hjelle, David

Land og Folk, 1932

8/rb3Q1p/1b1B1N1K/2n2k2/2r4p/1qp4P/1pn4N/1B6

#2

7 + 12

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sd5#
    • 1...Rg4
      • 2.hxg4#
    • 1...Be4
      • 2.Sd7#
  • Tries
    • 1.Qxh7+?
      • 1...Kxf6
        • 2.Qg6#
      • 1...Ke6!
  • Keys
    • 1.Shg4!
      • threat
        • 2.Se3#
      • 1...Rxg4
        • 2.hxg4#
      • 1...Re4
        • 2.Sd5#
      • 1...Be4
        • 2.Sd7#
      • 1...Sd3
        • 2.Qd7#
      • 1...Sa4
        • 2.Qd7#
      • 1...Se4
        • 2.Qd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(e);N_SPINS(b),SBLOCK::QAR(G)+S(E)
    • R(e);OGATE::P(C),XR(e)
    • B(k);N_SPINS(b),SBLOCK::QAR(G)+S(E)
  • Tries
    • Try
      • Q(G);CHECK,XP(l)
      • Vars
        • K(h);N_SPINS(b),P-FLIGHT,XS(E)::QAR1(G)
      • Refutation
        • K(h);N_SPINS(b),S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • R(e);OGATE,XS(B)::P(C),XR(e)
      • R(e);N_SPINS(b),SBLOCK::QAR(G)+S(E)
      • B(k);N_SPINS(b),SBLOCK::QAR(G)+S(E)
      • S(g);N_GUARD,N_SPINS(b)::QAB(G)
      • S(g);N_GUARD::QAB(G)
      • S(g);SBLOCK::QAB(G),XP(l)
      • S(g);N_GUARD::QAB(G),XS(g)
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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).