MESON Chess Problem Database

Problem Display
PID: 227644 (4k1n1/4N3/8/5Q2/1B6/8/8/2K5 w - - 0 1)

Langweil, Walter

Sachovy Svet, 1926

4k1n1/4N3/8/5Q2/1B6/8/8/2K5

#2

4 + 2

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Qc8#
  • Tries
    • 1.Sc6?
      • 1...Sf6
        • 2.Qe6#
      • 1...Sh6
        • 2.Qe6#
      • 1...Se7!
    • 1.Qf8+?
      • 1...Kd7
        • 2.Qc8#
      • 1...Kxf8!
  • Keys
    • 1.Qe6!
      • 1...Kd8
        • 2.Qc8#
      • 1...Kf8
        • 2.Qxg8#
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Sf6
        • 2.Sc6#
      • 1...Sh6
        • 2.Sc6#

Anticipated by 20966(1914)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR1(C)
  • Tries
    • Try
      • S(D);
      • Vars
        • S(b);N_GUARD::QAR2(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);P-FLIGHT::QAR1(C),XS(b)
      • S(b);OGATE,P_SPINS(b),XS(D)::QAR1(C),XS(b)
      • S(b);N_GUARD::QAR(C)+S(D)
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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).