MESON Chess Problem Database

Problem Display
PID: 189407 (4N3/4p2r/3P1P2/RK1k1B2/3p3n/3N1P2/8/8 w - - 0 1)

Chamberlain, Brian E

Problem Observer, 2019

4N3/4p2r/3P1P2/RK1k1B2/3p3n/3N1P2/8/8

#2

8 + 5

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Sb4#
    • 1...e6
      • 2.Be4#
  • Tries
    • 1.Ka4+?
      • 1...Kc4
        • 2.Rc5#
      • 1...Kc6!
    • 1.Ka6+?
      • 1...Kc6
        • 2.Sb4#
        • 2.Se5#
        • 2.Rc5#
      • 1...Kc4!
  • Keys
    • 1.Ra6!
      • threat
        • 2.Sc7#
      • 1...exd6
        • 2.Rxd6#
      • 1...exf6
        • 2.Sxf6#
      • 1...e5
        • 2.Sb4#
      • 1...e6
        • 2.Be4#

Anticipated by 173201(2012)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(d);SBLOCK::S(A)
    • P(d);SBLOCK::B(E)
  • Tries
    • Try
      • K(D);CHECK,S_FLIGHT
      • Vars
        • K(c);S_FLIGHT::R1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • K(D);CHECK,S_FLIGHT
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(C);
    • Threat
      • S(H)
    • Vars
      • P(d);OGATE,XP(F)::R1(C),XP(d)
      • P(d);XP(G)::S(H),XP(d)
      • P(d);SBLOCK::S(A)
      • P(d);SBLOCK::B(E)
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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).