MESON Chess Problem Database

Problem Display
PID: 62266 (5q2/1R3P1k/4n2p/7b/8/8/1B4Q1/7K w - - 0 1)

Kossak, Karl Ludwig Ernst

Schachzeitung der Berliner Schachgesellschaft, 1853

5q2/1R3P1k/4n2p/7b/8/8/1B4Q1/7K

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qg8#
      • 2.f8S#
    • 1...Qb4
      • 2.Qg8#
      • 2.f8S#
    • 1...Qc5
      • 2.Qg8#
      • 2.f8S#
    • 1...Qd6
      • 2.Qg8#
      • 2.f8S#
    • 1...Qe7
      • 2.Qg8#
    • 1...Qa8
      • 2.f8S#
    • 1...Qb8
      • 2.f8S#
    • 1...Qc8
      • 2.f8S#
    • 1...Qd8
      • 2.f8S#
    • 1...Qe8
      • 2.f8S#
    • 1...Qg8
      • 2.Qxg8#
      • 2.fxg8Q#
      • 2.fxg8B#
      • 2.f8S#
    • 1...Qh8
      • 2.f8S#
    • 1...Bd1
      • 2.Qe4#
    • 1...Be2
      • 2.Qe4#
  • Keys
    • 1.Qg8+!
      • 1...Qxg8
        • 2.f8S#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(e);N_GUARD::QAB1(C)
    • Q(e);OGATE,SBLOCK::P=S
    • Q(e);OGATE::P=S
    • B(a);N_GUARD::QAB(C)
  • Actual
    • Q(C);CHECK
    • Vars
      • Q(e);OGATE,SBLOCK,XQ(C)::P=S
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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).