MESON Chess Problem Database

Problem Display
PID: 197652 (8/1Q6/1n6/3q2R1/3P4/4P3/7P/KR2N1Nk w - - 0 1)

Shire, David J

The Problemist, 2019

8/1Q6/1n6/3q2R1/3P4/4P3/7P/KR2N1Nk

#2

9 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kxh2
      • 2.Qh7#
    • 1...Qg2
      • 2.Qxg2#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sf3#
      • 1...Kxh2
        • 2.Qh7#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qf3
        • 2.Sxf3#
      • 1...Qc6!
    • 1.Qxd5+?
      • 1...Kxh2
        • 2.Rb2#
        • 2.Qg2#
      • 1...Sxd5!
  • Keys
    • 1.Sc2!
      • threat
        • 2.Sf3#
      • 1...Kxh2
        • 2.Qh7#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qf3
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINQ(b),OGATEB,P-FLIGHT,XP(E)::QAR(I)
    • Q(b);OGATE::QAB1(I),XQ(b)
  • Tries
    • Try
      • S(C);
      • Threat
        • R(B)+S(D)
      • Vars
        • K(a);N_SPINQ(b),OGATEB,P-FLIGHT,XP(E)::QAR(I)
        • Q(b);OGATE::QAB1(I),XQ(b)
        • Q(b);::R(B)+S(D),XQ(b)
      • Refutation
        • Q(b);
    • Try
      • Q(I);CHECK,XQ(b)
      • Refutation
        • S(c);XQ(I)
  • Actual
    • S(C);
    • Threat
      • R(B)+S(D)
    • Vars
      • K(a);N_SPINQ(b),OGATEB,P-FLIGHT,XP(E)::QAR(I)
      • Q(b);OGATE::QAB1(I),XQ(b)
      • Q(b);::R(B)+S(D),XQ(b)
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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).