MESON Chess Problem Database

Problem Display
PID: 230111 (8/pPp5/r1rp4/Nk1p4/3p4/1N1n4/2R5/QK3B2 w - - 0 1)

Scheel, Johan

Tidskrift for Schack, 1913

8/pPp5/r1rp4/Nk1p4/3p4/1N1n4/2R5/QK3B2

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.b8Q#
      • 2.b8R#
    • 1...Rxa5
      • 2.Qxa5#
  • Tries
    • 1.Sxd4+?
      • 1...Kb6
        • 2.Rxc6#
        • 2.b8Q#
        • 2.b8R#
      • 1...Kb4!
    • 1.Qa4+?
      • 1...Kb6
        • 2.Rxc6#
        • 2.Qxc6#
        • 2.b8Q#
        • 2.b8R#
      • 1...Kxa4!
  • Keys
    • 1.Sc5!
      • 1...Kb4
        • 2.Qa4#
      • 1...Kb6
        • 2.b8Q#
        • 2.b8R#
      • 1...Rxa5
        • 2.Qb2#
      • 1...Rxc5
        • 2.Rb2#
      • 1...dxc5
        • 2.Rb2#
      • 1...Rab6
        • 2.Qa4#
      • 1...Rcb6
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINS(a),P-FLIGHT::P=Q
    • R(e);OGATE,XS(F)::QAR1(A),XR(e)
  • Tries
    • Try
      • S(E);CHECK,XP(b)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(c);N_SPINS(a),S_FLIGHT,XQ(A)
  • Actual
    • S(E);
    • Vars
      • K(c);N_SPINS(a),P-FLIGHT::QAR1(A)
      • K(c);N_SPINS(a),P-FLIGHT::P=Q
      • R(e);SBLOCK,XS(F)::QAR(A)
      • R(f);SBLOCK,XS(E)::R(D)
      • P(g);SBLOCK,XS(E)::R(D)
      • R(e);SBLOCK::QAB1(A)
      • R(f);SBLOCK::QAB1(A)
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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).