MESON Chess Problem Database

Problem Display
PID: 169974 (8/1Q5R/8/N3pk2/7K/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

8/1Q5R/8/N3pk2/7K/8/8/8

#2

4 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qf7#
    • 1...Kg6
      • 2.Qf7#
  • Tries
    • 1.Rf7+?
      • 1...Ke6
        • 2.Qd7#
      • 1...Kg6!
    • 1.Qf3+?
      • 1...Kg6
        • 2.Qf7#
      • 1...Ke6!
    • 1.Qd5?
      • 1...Kf6
        • 2.Qf7#
      • 1...Kg6
        • 2.Qf7#
      • 1...Kf4!
  • Keys
    • 1.Sc4!
      • 1...Kf4
        • 2.Rf7#
      • 1...Ke6
        • 2.Qf7#
      • 1...Kf6
        • 2.Qf7#
      • 1...Kg6
        • 2.Qf7#
      • 1...e4
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(C)
    • K(b);S_FLIGHT::QAB1(C)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(C)
        • K(b);N_SPINP(a),S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
  • Actual
    • S(B);
    • Vars
      • K(b);P-FLIGHT::R(D)
      • K(b);S_FLIGHT::QAB1(C)
      • K(b);P-FLIGHT::QAR1(C)
      • P(a);SBLOCK::QAR2(C)
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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).