MESON Chess Problem Database

Problem Display
PID: 85700 (1k1K4/b7/1nB5/1n6/8/8/QR6/8 w - - 0 1)

Speckmann, Werner

Schweizerische Arbeiter Schachzeitung, 1957

1k1K4/b7/1nB5/1n6/8/8/QR6/8

#2

4 + 4

56 The Problemist 1980
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qb7#
      • 1...Sd6
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#
      • 1...Sd7!
    • 1.Qxa7+?
      • 1...Sxa7
        • 2.Rxb6#
      • 1...Kxa7!
  • Keys
    • 1.Qe6!
      • 1...Sa3
        • 2.Qc8#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sc3
        • 2.Qc8#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sd4
        • 2.Qc8#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sc7
        • 2.Qc8#
      • 1...Sa4
        • 2.Qc8#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sc4
        • 2.Qc8#
      • 1...Sd5
        • 2.Qc8#
      • 1...Sd7
        • 2.Qd6#
      • 1...Sa8
        • 2.Qc8#
      • 1...Sc8
        • 2.Qxc8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(a);N_GUARD,P_SPINS(b)::QAB1(A)
        • S(a);N_GUARD,P_SPINS(b)::QAB1(A),XS(a)
      • Refutation
        • S(b);P_SPINS(a)
    • Try
      • Q(A);CHECK,XB(c)
      • Vars
        • S(a);OGATE,P_SPINS(b),SBLOCK,XQ(A)::R(B),XS(b)
      • Refutation
        • K(d);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Vars
      • S(a);N_GUARD,P_SPINS(b)::QAB(A),XS(a)
      • S(a);P_SPINS(b)::QAR1(A)
      • S(b);N_GUARD,P_SPINS(a)::QAR1(A)
      • S(b);P_SPINS(a)::QAB(A)
      • S(b);N_GUARD,P_SPINS(a)::QAR1(A),XS(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).