MESON Chess Problem Database

Problem Display
PID: 81274 (8/8/8/4NRn1/6Pk/8/6K1/8 w - - 0 1)

Lane, JF

The Field, 1951

(First published on Sat Apr 21 1951)

8/8/8/4NRn1/6Pk/8/6K1/8

#2

4 + 2

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Rh5#
    • 1...Sh3
      • 2.Rh5#
    • 1...Se4
      • 2.Rh5#
    • 1...Se6
      • 2.Rh5#
    • 1...Sf7
      • 2.Rh5#
    • 1...Sh7
      • 2.Rh5#
  • Tries
    • 1.Kh2?
      • 1...Sh3
        • 2.Rh5#
      • 1...Se4
        • 2.Rh5#
      • 1...Se6
        • 2.Rh5#
      • 1...Sf7
        • 2.Rh5#
      • 1...Sh7
        • 2.Rh5#
      • 1...Sf3+!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Sg6#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sh3
        • 2.Sf3#
      • 1...Se4
        • 2.Sf3#
      • 1...Se6
        • 2.Sf3#
      • 1...Sf7
        • 2.Sf3#
      • 1...Sh7
        • 2.Sf3#

Anticipated by 79839(1927)

This anticipates 18230(1954)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE::R1(D)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(b);OGATE::R1(D)
      • Refutation
        • S(b);CHECK
  • Actual
    • R(D);
    • Threat
      • S(C)
    • Vars
      • S(b);N_GUARD::S(C),XS(b)
      • S(b);N_GUARD::S(C)
HTML5 logo

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).