MESON Chess Problem Database

Problem Display
PID: 241831 (K7/8/2n5/8/7Q/4kN2/4p3/4N3 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1930

K7/8/2n5/8/7Q/4kN2/4p3/4N3

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sa5
      • 2.Qd4#
    • 1...Se5
      • 2.Qd4#
    • 1...Sa7
      • 2.Qd4#
    • 1...Se7
      • 2.Qd4#
    • 1...Sb8
      • 2.Qd4#
    • 1...Sd8
      • 2.Qd4#
  • Tries
    • 1.Qg5+?
      • 1...Kf2
        • 2.Qg1#
      • 1...Ke4!
    • 1.Qc4?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sb4
        • 2.Qd4#
      • 1...Sa5
        • 2.Qd4#
      • 1...Se5
        • 2.Qd4#
      • 1...Sa7
        • 2.Qd4#
      • 1...Se7
        • 2.Qd4#
      • 1...Sb8
        • 2.Qd4#
      • 1...Sd8
        • 2.Qd4#
      • 1...Kf2!
  • Keys
    • 1.Qg4!
      • 1...Kf2
        • 2.Qg1#
      • 1...Sb4
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa5
        • 2.Qd4#
      • 1...Se5
        • 2.Qd4#
      • 1...Sa7
        • 2.Qd4#
      • 1...Se7
        • 2.Qd4#
      • 1...Sb8
        • 2.Qd4#
      • 1...Sd8
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
      • S(c);N_GUARD::QAB1(C)
      • S(c);N_GUARD::QAB1(C),XS(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).