MESON Chess Problem Database

Problem Display
PID: 205529 (4K1Qn/4P3/5k2/5p2/5P2/8/8/8 w - - 0 1)

Pape, Edouard

L'Echiquier Marseillais, 1925

4K1Qn/4P3/5k2/5p2/5P2/8/8/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sg6
      • 2.Qf7#
    • 1...Sf7
      • 2.Qxf7#
  • Tries
    • 1.Kf8?
      • threat
        • 2.e8S#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sg6+!
    • 1.Qh7?
      • 1...Sg6
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Ke6!
    • 1.Qg7+?
      • 1...Ke6
        • 2.Qe5#
      • 1...Kxg7!
    • 1.Qxh8+?
      • 1...Ke6
        • 2.Qe5#
      • 1...Kg6!
  • Keys
    • 1.Kd7!
      • threat
        • 2.e8S#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD::QAR1(D)
    • S(c);N_GUARD::QAR1(D),XS(c)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • P=S
      • Vars
        • S(c);N_GUARD::QAR1(D),XS(c)
      • Refutation
        • S(c);CHECK
    • Try
      • Q(D);
      • Vars
        • S(c);N_GUARD::QAR1(D)
        • S(c);N_GUARD::QAR1(D),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK,XS(c)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • K(C);S_FLIGHT
    • Threat
      • P=S
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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).