MESON Chess Problem Database

Problem Display
PID: 232827 (8/1B6/1pQ1p3/1P1pk1K1/3pN3/8/5P2/8 w - - 0 1)

Koller, Paul

Freie Presse, 1973

8/1B6/1pQ1p3/1P1pk1K1/3pN3/8/5P2/8

#2

6 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...dxe4
      • 2.Qc7#
  • Tries
    • 1.Qc2?
      • threat
        • 2.f4#
      • 1...dxe4
        • 2.Qc7#
      • 1...d3!
    • 1.f3?
      • threat
        • 2.Qd6#
        • 2.Qc7#
      • 1...dxe4
        • 2.Qc7#
        • 2.f4#
      • 1...d3!
  • Keys
    • 1.Qc4!
      • 1...Kxe4
        • 2.Qe2#
      • 1...dxc4
        • 2.f4#
      • 1...dxe4
        • 2.Qc7#
      • 1...d3
        • 2.f4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);XS(B)::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • P(A)
      • Vars
        • P(b);XS(B)::QAB(E)
      • Refutation
        • P(a);
    • Try
      • P(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(a);
  • Actual
    • Q(E);
    • Vars
      • K(c);OGATEB,P-FLIGHT,P_SPINP(a),XS(B)::QAR2(E)
      • P(b);XQ(E)::P(A)
      • P(b);XS(B)::QAB(E)
      • P(a);::P(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).