MESON Chess Problem Database

Problem Display
PID: 186069 (4k2r/5p2/2K2Q2/7N/8/8/4p3/8 w k - 0 1)

Ouellet, Charles

Problem Observer, 2017

4k2r/5p2/2K2Q2/7N/8/8/4p3/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Qd8#
    • 1...Rf8
      • 2.Sg7#
    • 1...0-0
      • 2.Qg7#
  • Tries
    • 1.Kd6?
      • threat
        • 2.Qe7#
        • 2.Qxh8#
      • 1...Kf8
        • 2.Qd8#
        • 2.Qxh8#
      • 1...0-0
        • 2.Qg7#
      • 1...Rxh5
        • 2.Qe7#
      • 1...e1Q
        • 2.Qxh8#
      • 1...e1R
        • 2.Qxh8#
      • 1...Rh7
        • 2.Qe7#
      • 1...Rf8
        • 2.Sg7#
        • 2.Qe7#
      • 1...Rg8
        • 2.Qe7#
      • 1...Rh6!
    • 1.Qxf7+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kxf7!
  • Keys
    • 1.Kc7!
      • threat
        • 2.Qd8#
      • 1...Kf8
        • 2.Qd8#
      • 1...0-0
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT,P_SPINP(b)::QAR2(C)
    • R(d);SBLOCK::S(A)
    • K(c);0-0,OGATEB::QAR1(C)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(c);0-0,OGATEB::QAR1(C)
        • R(d);XS(A)::QAR1(C)
        • P(a);::QAR(C),XR(d)
        • R(d);::QAR1(C)
      • Refutation
        • R(d);P_PINQ(C)
    • Try
      • Q(C);CHECK,XP(b)
      • Vars
        • K(c);P-FLIGHT::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • K(B);P-FLIGHT
    • Threat
      • QAR1(C)
    • Vars
      • K(c);P-FLIGHT,P_SPINP(b)::QAR2(C)
      • K(c);0-0,OGATEB::QAR1(C)
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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).