MESON Chess Problem Database

Problem Display
PID: 231062 (7K/8/8/4k1N1/4P3/2R5/8/7Q w - - 0 1)

Efrosinin, Oleg

Kudesnik, 2011

7K/8/8/4k1N1/4P3/2R5/8/7Q

#2

5 + 1

15148 Sadier Collection 2021
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Tries
    • 1.Qf3?
      • 1...Kd4
        • 2.Qf6#
      • 1...Kd6!
    • 1.Qf1?
      • 1...Kd4
        • 2.Qf6#
      • 1...Kd6!
    • 1.Qh6?
      • 1...Kd4
        • 2.Qg7#
        • 2.Qf6#
      • 1...Kf4!
  • Keys
    • 1.Qh7!
      • 1...Kd4
        • 2.Qg7#
      • 1...Kf4
        • 2.Qf5#
      • 1...Kd6
        • 2.Qc7#
      • 1...Kf6
        • 2.Qg7#

Anticipated by 41263(1939), 176171(1960), 199603(1996), 142483(2006)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB(A)
      • K(a);S_FLIGHT::QAR1(A)
      • K(a);S_FLIGHT::QAB1(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).