MESON Chess Problem Database

Problem Display
PID: 240016 (4Q1K1/8/4N2k/3Nn3/8/6n1/8/8 w - - 0 1)

Lokker, Miklosh S

Die Schwalbe, 1971

4Q1K1/8/4N2k/3Nn3/8/6n1/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Se7?
      • 1...Sg6
        • 2.Qxg6#
      • 1...Sf1
        • 2.Sf5#
      • 1...Sh1
        • 2.Sf5#
      • 1...Se2
        • 2.Sf5#
      • 1...Se4
        • 2.Sf5#
      • 1...Sf5
        • 2.Sxf5#
      • 1...Sh5
        • 2.Sf5#
      • 1...Sd3
        • 2.Qg6#
      • 1...Sf3
        • 2.Qg6#
      • 1...Sc4
        • 2.Qg6#
      • 1...Sg4
        • 2.Qg6#
      • 1...Sc6
        • 2.Qg6#
      • 1...Sd7
        • 2.Qg6#
      • 1...Sf7!
    • 1.Qe7?
      • threat
        • 2.Qg5#
        • 2.Qh7#
      • 1...Kh5
        • 2.Qg5#
      • 1...Kg6
        • 2.Qg5#
        • 2.Qh7#
      • 1...Se4
        • 2.Qh7#
      • 1...Sf3
        • 2.Qh7#
      • 1...Sf7!
    • 1.Qf8+?
      • 1...Kg6
        • 2.Sdf4#
      • 1...Kh5!
  • Keys
    • 1.Sdf4!
      • threat
        • 2.Qf8#
      • 1...Sf5
        • 2.Qh5#
      • 1...Sh5
        • 2.Qxh5#
      • 1...Sg6
        • 2.Qxg6#
      • 1...Sd7
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(A);
      • Vars
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(a);N_GUARD::S(A)
        • S(a);N_GUARD::S(A),XS(a)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::QAR1(C)
        • S(a);::QAR1(C)
        • S(b);::QAR1(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT::S(A)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • S(A);
    • Threat
      • QAB(C)
    • Vars
      • S(a);N_GUARD::QAR1(C)
      • S(a);N_GUARD::QAR1(C),XS(a)
      • S(b);N_GUARD::QAR1(C),XS(b)
      • S(b);N_GUARD::QAR1(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).