MESON Chess Problem Database

Problem Display
PID: 255112 (5N1k/5nr1/5KpN/6P1/8/8/8/Q7 w - - 0 1)

Klassen, A

Wiener Schachzeitung, 1936

5N1k/5nr1/5KpN/6P1/8/8/8/Q7

#2

5 + 4

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rh7
      • 2.Sxg6#
    • 1...Rg8
      • 2.Sxf7#
  • Tries
    • 1.Sxf7+?
      • 1...Rxf7+
        • 2.Kxf7#
      • 1...Kg8!
  • Keys
    • 1.Qa7!
      • 1...Sxg5
        • 2.Qxg7#
      • 1...Sxh6
        • 2.Qxg7#
      • 1...Rh7
        • 2.Sxg6#
      • 1...Rg8
        • 2.Sxf7#
      • 1...Se5
        • 2.Qxg7#
      • 1...Sd6
        • 2.Qxg7#
      • 1...Sd8
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD,SBLOCK::S(E),XP(a)
    • R(c);N_GUARD,SBLOCK::S(D),XS(b)
  • Tries
    • Try
      • S(D);CHECK,XS(b)
      • Vars
        • R(c);CHECK,XS(D)::QAB(A)+K(C),XR(c)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • S(b);OGATE,XP(B)::QAB1(A),XR(c)
      • S(b);OGATE,XS(D)::QAB1(A),XR(c)
      • R(c);N_GUARD,SBLOCK::S(E),XP(a)
      • R(c);N_GUARD,SBLOCK::S(D),XS(b)
      • S(b);OGATE::QAB1(A),XR(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).