MESON Chess Problem Database

Problem Display
PID: 215511 (K4NkN/8/7B/8/4p3/4Q3/p7/q7 w - - 0 1)

Schetelich, Fritz

Funkschach, 1926

K4NkN/8/7B/8/4p3/4Q3/p7/q7

#2

5 + 4

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh8
      • 2.Qb3#
  • Tries
    • 1.Qg5+?
      • 1...Qg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Qg3+?
      • 1...Qg7
        • 2.Qxg7#
      • 1...Kxh8!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qh7#
      • 1...Kxh8
        • 2.Qh7#
      • 1...Qxh8
        • 2.Qxa2#
      • 1...Qg7
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);SBLOCK,XS(E)::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR1(A),XQ(a)
      • Refutation
        • K(d);P-FLIGHT,XS(E)
    • Try
      • Q(A);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR1(A),XQ(a)
      • Refutation
        • K(d);P-FLIGHT,XS(E)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(d);P-FLIGHT,XS(E)::QAR1(A)
      • Q(a);N_GUARD,SBLOCK,XS(E)::QAB(A),XP(b)
      • Q(a);N_GUARD::QAR1(A),XQ(a)
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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).