MESON Chess Problem Database

Problem Display
PID: 231728 (K5N1/P2p1p2/3P1P1R/4B1k1/2pN4/2P4P/Qp5P/8 w - - 0 1)

Lindgren, Frithiof

Die Schwalbe, 1929

K5N1/P2p1p2/3P1P1R/4B1k1/2pN4/2P4P/Qp5P/8

#2

12 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...b1Q
      • 2.Qd2#
      • 2.Qg2#
    • 1...b1S
      • 2.Qg2#
    • 1...b1B
      • 2.Qd2#
      • 2.Qg2#
    • 1...b1R
      • 2.Qd2#
      • 2.Qg2#
  • Tries
    • 1.Rh7?
      • 1...b1Q
        • 2.Qg2#
      • 1...b1S
        • 2.Qg2#
      • 1...b1B
        • 2.Qg2#
      • 1...b1R
        • 2.Qg2#
      • 1...Kg6!
    • 1.Rh8?
      • 1...b1Q
        • 2.Qg2#
      • 1...b1S
        • 2.Qg2#
      • 1...b1B
        • 2.Qg2#
      • 1...b1R
        • 2.Qg2#
      • 1...Kg6!
  • Keys
    • 1.Bg3!
      • threat
        • 2.Qa5#
      • 1...b1Q
        • 2.Qd2#
      • 1...b1B
        • 2.Qd2#
      • 1...b1R
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE::QAR(A)
  • Tries
    • Try
      • R(I);
      • Vars
        • P(a);OGATE::QAR(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • R(I);
      • Vars
        • P(a);OGATE::QAR(A)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(F);
    • Threat
      • QAR(A)
    • Vars
      • P(a);OGATE::QAB(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).