MESON Chess Problem Database

Problem Display
PID: 101372 (5rb1/5nK1/4Q3/7p/6N1/5N1k/5Pq1/5B2 w - - 0 1)

Sparke, Arthur M

Good Companions, 1920

5rb1/5nK1/4Q3/7p/6N1/5N1k/5Pq1/5B2

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf1
      • 2.Se3#
    • 1...h4
      • 2.Sg1#
  • Tries
    • 1.Qg6?
      • threat
        • 2.Qxh5#
      • 1...hxg4
        • 2.Qh5#
      • 1...h4
        • 2.Sg1#
      • 1...Qxf1!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qxh5#
      • 1...Qxf1
        • 2.Se3#
      • 1...hxg4
        • 2.Qh5#
      • 1...Sg5
        • 2.Sf6#
      • 1...h4
        • 2.Sg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_PINS(D),N_SPINQ(a),XB(A)::QAB(E)+S(D)
    • P(c);SBLOCK::S(C)
  • Tries
    • Try
      • Q(E);N_SPINS(D)
      • Threat
        • QAR2(E),XP(c)
      • Vars
        • P(c);XS(D)::QAR2(E)
        • P(c);SBLOCK::S(C)
      • Refutation
        • Q(a);N_SPINQ(a),XB(A)
  • Actual
    • Q(E);
    • Threat
      • QAR2(E),XP(c)
    • Vars
      • Q(a);N_PINS(D),N_SPINQ(a),XB(A)::QAB(E)+S(D)
      • P(c);P_SPINP(c),XS(D)::QAR2(E)
      • S(d);N_PINS(D)::QAB(E)+S(D)
      • P(c);SBLOCK::S(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).