MESON Chess Problem Database

Problem Display
PID: 214898 (4Q3/8/4p3/4pN2/4kN2/8/4K1P1/8 w - - 0 1)

Koerper, Rudolph

St. Louis Globe Democrat, 1878

4Q3/8/4p3/4pN2/4kN2/8/4K1P1/8

#2

5 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...exf4
      • 2.Qxe6#
    • 1...exf5
      • 2.Qa4#
  • Tries
    • 1.Qf7?
      • 1...exf4
        • 2.Qxe6#
      • 1...exf5
        • 2.Qc4#
      • 1...Kxf4!
    • 1.g4?
      • threat
        • 2.Qa4#
      • 1...exf4
        • 2.Qxe6#
      • 1...Kxf4!
  • Keys
    • 1.g3!
      • 1...Kxf5
        • 2.Qg6#
      • 1...exf4
        • 2.Qxe6#
      • 1...exf5
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB,P_SPINP(c),SBLOCK,XS(C)::QAR2(E),XP(c)
    • P(c);P_SPINP(b),SBLOCK,XS(D)::QAR(E)
  • Tries
    • Try
      • Q(E);
      • Vars
        • P(b);OGATEB,SBLOCK,XS(C)::QAR2(E),XP(c)
        • P(c);OGATE,SBLOCK,XS(D)::QAR2(E)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • P(B);
      • Threat
        • QAR(E)
      • Vars
        • P(b);OGATEB,P_SPINP(c),SBLOCK,XS(C)::QAR2(E),XP(c)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
  • Actual
    • P(B);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(D)::QAB1(E)
      • P(b);OGATEB,P_SPINP(c),XS(C)::QAR2(E),XP(c)
      • P(c);P_SPINP(b),SBLOCK,XS(D)::QAR(E)
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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).