MESON Chess Problem Database

Problem Display
PID: 198116 (8/1K6/4p3/1N1k4/8/4p3/3NQ3/8 w - - 0 1)

Lindgren, Frithiof

Deutsches Wochenschach, 1920

8/1K6/4p3/1N1k4/8/4p3/3NQ3/8

#2

4 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qc4#
    • 1...e5
      • 2.Qc4#
  • Tries
    • 1.Qd3+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Ke5!
    • 1.Qf3+?
      • 1...Ke5
        • 2.Sc4#
      • 1...Kc5!
    • 1.Qg2+?
      • 1...Ke5
        • 2.Qg5#
      • 1...Kc5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Ke5
        • 2.Qg5#
      • 1...e5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(B)
    • P(c);SBLOCK::QAB1(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::S(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(b);P-FLIGHT::QAR1(B)
      • K(b);P-FLIGHT::QAR2(B)
      • P(c);SBLOCK::QAB1(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).