MESON Chess Problem Database

Problem Display
PID: 227469 (6R1/3n1k2/3K2R1/8/8/8/1n6/5B2 w - - 0 1)

Junker, Karl

Neue Leipziger Zeitung, 1926

6R1/3n1k2/3K2R1/8/8/8/1n6/5B2

#2

4 + 3

6490 yacpdb 2020
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Bc4#
    • 1...Sa4
      • 2.Bc4#
    • 1...Sc4+
      • 2.Bxc4#
    • 1...Sf6
      • 2.R6g7#
  • Tries
    • 1.Kxd7?
      • 1...Sd1
        • 2.Bc4#
      • 1...Sa4
        • 2.Bc4#
      • 1...Sc4
        • 2.Bxc4#
      • 1...Sd3!
  • Keys
    • 1.Bb5!
      • 1...Sc4+
        • 2.Bxc4#
      • 1...Sd3
        • 2.Bc4#
      • 1...Sd1
        • 2.Bc4#
      • 1...Sa4
        • 2.Bc4#
      • 1...Sc5
        • 2.Be8#
      • 1...Se5
        • 2.Be8#
      • 1...Sb6
        • 2.Be8#
      • 1...Sf6
        • 2.R6g7#
      • 1...Sb8
        • 2.Be8#
      • 1...Sf8
        • 2.R8g7#

This anticipates 87591(1991)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::B(A)
    • S(a);CHECK,N_GUARD::B(A),XS(a)
    • S(b);SBLOCK::R1(C)
  • Tries
    • Try
      • K(B);P-FLIGHT,XS(b)
      • Vars
        • S(a);N_GUARD::B(A)
        • S(a);N_GUARD::B(A),XS(a)
      • Refutation
        • S(a);
  • Actual
    • B(A);
    • Vars
      • S(a);CHECK,N_GUARD::B(A),XS(a)
      • S(a);N_GUARD::B(A)
      • S(b);OGATE::B(A)
      • S(b);SBLOCK::R1(C)
      • S(b);SBLOCK::R1(D)
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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).