MESON Chess Problem Database

Problem Display
PID: 146203 (4B1n1/4PNbk/K3p2q/4n3/2p2N2/8/8/6QR w - - 0 1)

Caine, Walter Edmund

British Chess Magazine, 1935

4B1n1/4PNbk/K3p2q/4n3/2p2N2/8/8/6QR

#2

7 + 7

14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Bf8
      • 2.exf8S#
    • 1...Sd3
      • 2.Qg6#
    • 1...Sf3
      • 2.Qb1#
      • 2.Qg6#
    • 1...Sg4
      • 2.Qb1#
    • 1...Sc6
      • 2.Qb1#
      • 2.Qg6#
    • 1...Sg6
      • 2.Qxg6#
    • 1...Sd7
      • 2.Qb1#
      • 2.Qg6#
  • Tries
    • 1.Qb1+?
      • 1...Sg6
        • 2.Qxg6#
      • 1...Sd3!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Qxg7#
      • 1...Sg4
        • 2.Qb1#
      • 1...Bf6
        • 2.Sf8#
      • 1...Bf8
        • 2.exf8S#
      • 1...Bh8
        • 2.Sg5#
      • 1...Sg6
        • 2.Seg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(e);OGATE::PXB(e)=S
    • S(b);N_GUARD::QAB1(A)
    • S(b);N_GUARD::QAB(A)
    • S(b);N_GUARD::QAB1(A),XS(b)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • S(C);P_SPINS(C),XP(c)
    • Threat
      • QAR1(A),XB(e)
    • Vars
      • S(b);N_GUARD::QAB(A)
      • B(e);N_PINS(C)::S(C)
      • B(e);OGATE::PXB(e)=S
      • B(e);SBLOCK::S(F)
      • S(b);N_PINS(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).