MESON Chess Problem Database

Problem Display
PID: 10309 (K3k2N/Q3P2r/1N4P1/2n5/6r1/B6B/8/8 w - - 0 1)

Novikov, V

Problem (Zagreb), 1963

K3k2N/Q3P2r/1N4P1/2n5/6r1/B6B/8/8

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe7
      • 2.Qb8#
    • 1...Rf7
      • 2.gxf7#
    • 1...Sb3
      • 2.Qb8#
      • 2.Qd7#
    • 1...Sd3
      • 2.Qb8#
      • 2.Qd7#
    • 1...Sa4
      • 2.Qb8#
      • 2.Qd7#
    • 1...Se4
      • 2.Qb8#
      • 2.Qa4#
      • 2.Qd7#
    • 1...Sa6
      • 2.Qd7#
    • 1...Se6
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
  • Tries
    • 1.Bxc5?
      • threat
        • 2.Qb8#
        • 2.Qd7#
      • 1...Rxe7
        • 2.Qb8#
        • 2.Qxe7#
      • 1...Ra4
        • 2.Bd7#
        • 2.Qxa4#
      • 1...Rd4!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sf6#
      • 1...Rxg6
        • 2.Qb8#
      • 1...Rxe7
        • 2.Qxe7#
      • 1...Rf4
        • 2.Qb8#
      • 1...Rf7
        • 2.gxf7#
      • 1...Se4
        • 2.Qa4#
      • 1...Sd7
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(c);SBLOCK,XP(F)::QAR(E)
    • R(c);OGATE::P(D),XR(c)
    • S(b);N_GUARD::QAB1(E)
    • S(b);N_GUARD::QAB1(E),XS(b)
  • Tries
    • Try
      • B(A);XS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • R(a);
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • R(a);XP(D)::QAR(E)
      • R(c);OGATE,XP(F)::QAR1(E),XR(c)
      • R(a);::QAR(E)
      • R(c);OGATE::P(D),XR(c)
      • S(b);N_GUARD,S_CUTR(a)::QAB(E)
      • S(b);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).