MESON Chess Problem Database

Problem Display
PID: 146503 (q4R2/1p4p1/p2N1b2/B3N3/7p/4r2r/pQ2nkpP/K2BR1n1 w - - 0 1)

Anonymous

L'Echiquier, 1946

q4R2/1p4p1/p2N1b2/B3N3/7p/4r2r/pQ2nkpP/K2BR1n1

#2

9 + 13

14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ref3
      • 2.Sg4#
    • 1...Rhf3
      • 2.Sg4#
    • 1...Sf3
      • 2.Sg4#
  • Tries
    • 1.Rxf6+?
      • 1...Ref3
        • 2.Sg4#
      • 1...Rhf3
        • 2.Sg4#
      • 1...Sf3
        • 2.Sg4#
      • 1...gxf6!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Se4#
      • 1...Sc3
        • 2.Sd3#
      • 1...Sg3
        • 2.Qxe3#
      • 1...Sd4
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(f);N_SPINB(j),SBLOCK::S(G)
    • R(g);N_SPINB(j),SBLOCK::S(G)
    • S(a);N_SPINB(j),SBLOCK::S(G)
  • Tries
    • Try
      • R(I);CHECK,XB(j)
      • Vars
        • R(f);P_SPINR(f)::S(G)
        • R(g);P_SPINR(g)::S(G)
        • S(a);::S(G)
      • Refutation
        • P(l);XR(I)
  • Actual
    • Q(D);N_PINS(c),P_PINR(f),P_SPINS(G)
    • Threat
      • S(H)
    • Vars
      • S(c);N_PINS(G)::S(G)
      • S(c);S_CUTR(g)::QAB1(D),XR(f)
      • S(c);N_PINS(G),N_SPINR(f)::S(G)
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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).