MESON Chess Problem Database

Problem Display
PID: 51109 (8/4P3/8/4p3/4k3/1K2p2P/4Q3/8 w - - 0 1)

Watson, RF

Burnley Express, 1882

8/4P3/8/4p3/4k3/1K2p2P/4Q3/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc4#
    • 1...Kf4
      • 2.Qg4#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Qg4#
      • 1...Kf4
        • 2.Qg4#
      • 1...Kf5!
  • Keys
    • 1.e8S!
      • 1...Kd4
        • 2.Qc4#
      • 1...Kf4
        • 2.Qg4#
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),P-FLIGHT::QAR1(A)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR2(A)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
  • Actual
    • P(D);
    • Vars
      • K(b);N_SPINP(a),P-FLIGHT::QAR1(A)
      • K(b);N_SPINP(a),S_FLIGHT::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).