MESON Chess Problem Database

Problem Display
PID: 208866 (8/Q7/6p1/2K3pN/6kP/6p1/1p4P1/1B6 w - - 0 1)

Forsting, John J

St. Louis Globe Democrat, 1876

8/Q7/6p1/2K3pN/6kP/6p1/1p4P1/1B6

#2

6 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...gxh5
      • 2.Qa4#
  • Tries
    • 1.Sf6+?
      • 1...Kxh4
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qd7+?
      • 1...Kxh4
        • 2.Qh3#
      • 1...Kxh5!
  • Keys
    • 1.Qh7!
      • 1...Kxh4
        • 2.Sf6#
      • 1...gxh4
        • 2.Qxg6#
      • 1...gxh5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(e);SBLOCK,XS(E)::QAR(F)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAR(F)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT,XP(C)::QAR1(F)
      • Refutation
        • K(c);S_FLIGHT,XS(E)
  • Actual
    • Q(F);
    • Vars
      • K(c);P-FLIGHT,XP(C)::QAR(F)+S(E)
      • P(d);OGATEB,SBLOCK,XP(C)::QAR2(F),XP(e)
      • P(e);OGATE,SBLOCK,XS(E)::QAR2(F)
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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).