MESON Chess Problem Database

Problem Display
PID: 190959 (2B5/8/2Np4/1p1k4/1P6/1KQ1p1n1/4P3/8 w - - 0 1)

Junks, EAG

The Observer, 1939

(First published on Sun Jan 8 1939)

2B5/8/2Np4/1p1k4/1P6/1KQ1p1n1/4P3/8

#2

6 + 5

5454 Near Snap 2019
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qd4#
    • 1...Se4
      • 2.Se7#
  • Tries
    • 1.Be6+?
      • 1...Ke4
        • 2.Qd4#
      • 1...Kxe6!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Qd4#
      • 1...dxc5!
  • Keys
    • 1.Qg7!
      • 1...Ke4
        • 2.Qd4#
      • 1...Kxc6
        • 2.Qb7#
      • 1...Sxe2
        • 2.Qg2#
      • 1...Sf1
        • 2.Qg2#
      • 1...Sh1
        • 2.Qg2#
      • 1...Se4
        • 2.Se7#
      • 1...Sf5
        • 2.Qg2#
      • 1...Sh5
        • 2.Qg2#

Anticipated by 174918(1901)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(d);S_FLIGHT::QAR1(C)
    • S(b);SBLOCK::S(E)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(C)
      • Refutation
        • K(d);S_FLIGHT,XB(F)
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(C)
      • Refutation
        • P(e);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(d);S_FLIGHT::QAR1(C)
      • K(d);OGATEB,S_FLIGHT,XS(E)::QAB1(C)
      • S(b);OGATE,XP(A)::QAB(C)
      • S(b);OGATE::QAB(C)
      • S(b);SBLOCK::S(E)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).