MESON Chess Problem Database

Problem Display
PID: 232702 (5qrk/6Rr/5Q2/7n/3BN1b1/7R/8/6K1 w - - 0 1)

Frohlich, Georg

Freie Presse, 1973

5qrk/6Rr/5Q2/7n/3BN1b1/7R/8/6K1

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rh6
      • 2.Qxh6#
    • 1...Rhxg7
      • 2.Qh6#
    • 1...Rgxg7
      • 2.Qxf8#
    • 1...Sg3
      • 2.Rhxh7#
      • 2.Rgxh7#
    • 1...Sf4
      • 2.Rhxh7#
      • 2.Rgxh7#
    • 1...Sxf6
      • 2.Rgxh7#
  • Keys
    • 1.Sg5!
      • threat
        • 2.Rxh7#
      • 1...Qxg7
        • 2.Sf7#
      • 1...Rhxg7
        • 2.Qh6#
      • 1...Rgxg7
        • 2.Qxf8#
      • 1...Sxg7
        • 2.Rxh7#
      • 1...Rh6
        • 2.Rh7#
        • 2.Qxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(c);OGATEB::QAR2(E),XR(c)
    • R(c);OGATEB,P_SPINR(c),P_SPINS(b),XR(F)::QAR2(E)
    • R(e);OGATEB,P_SPINR(e),XR(F)::QAR2(E),XQ(d)
    • S(b);P_SPINR(c),XQ(E)::R1(F),XR(c)
  • Actual
    • S(D);
    • Threat
      • QAB(E)+R(F),DCHECK,XR(c)
    • Vars
      • Q(d);N_GUARD,P_SPINQ(d),XR(F)::S(D)
      • R(c);OGATEB,P_SPINR(c),P_SPINS(b),XR(F)::QAR2(E)
      • R(e);OGATEB,P_SPINR(e),XR(F)::QAR2(E),XQ(d)
      • S(b);OGATE,P_SPINR(c),P_SPINS(b),XR(F)::R1(B),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).