MESON Chess Problem Database

Problem Display
PID: 203517 (2B5/KN2pr2/1P6/1Rp1k3/4n2Q/p5n1/1b2Pp2/B2R4 w - - 0 1)

Carra, N

3rd HM., Borgatti MT, 1924

2B5/KN2pr2/1P6/1Rp1k3/4n2Q/p5n1/1b2Pp2/B2R4

#2

9 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Qxe7#
    • 1...Sd2
      • 2.Rxc5#
    • 1...Sc3
      • 2.Qd4#
    • 1...Sd6
      • 2.Rxc5#
  • Tries
    • 1.Bxb2+?
      • 1...Sc3
        • 2.Bxc3#
        • 2.Rxc5#
        • 2.Qd4#
      • 1...axb2!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Sxe4#
      • 1...e6+
        • 2.Sd7#
      • 1...Sxc5
        • 2.Rxc5#
      • 1...Sd2
        • 2.Sb7#
      • 1...Sg5
        • 2.Se4#
      • 1...Rf4
        • 2.Qxe7#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sd6
        • 2.Sd3#
      • 1...Sf6
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(i);N_GUARD,SBLOCK::QAR2(D),XP(h)
    • S(e);N_GUARD::R(E),XP(f)
    • S(e);N_SPINB(a),OGATE::QAB1(D)
  • Tries
    • Try
      • B(A);CHECK,XB(a)
      • Refutation
        • P(c);XB(A)
  • Actual
    • S(H);XP(f)
    • Threat
      • R(E)+S(H),XS(e)
    • Vars
      • P(h);CHECK,SBLOCK::R(E)+S(H),DCHECK
      • S(e);OGATE,P_SPINS(e),XS(H)::R(E),XS(e)
      • S(e);N_GUARD::R(E)+S(H)
      • S(e);::R(E)+S(H)
      • R(i);N_GUARD,SBLOCK::QAR2(D),XP(h)
      • S(e);N_SPINB(a),OGATE::QAB1(D)
      • S(e);SBLOCK::R(E)+S(H),DCHECK
      • S(e);N_GUARD,SBLOCK,S_CUTR(i)::QAB(D),XS(d)
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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).