MESON Chess Problem Database

Problem Display
PID: 7370 (k7/3pKb2/8/8/1R4Q1/4B3/2r5/5R2 w - - 0 1)

Janev, Zoran

StrateGems, 1999

k7/3pKb2/8/8/1R4Q1/4B3/2r5/5R2

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Ra1#
    • 1...Bc4
      • 2.Rf8#
  • Tries
    • 1.Qxd7?
      • threat
        • 2.Qa4#
        • 2.Qa7#
        • 2.Qb7#
      • 1...Ra2
        • 2.Qc6#
        • 2.Qc8#
        • 2.Qb7#
        • 2.Qd8#
      • 1...Rc5
        • 2.Qb7#
      • 1...Rc6
        • 2.Qxc6#
        • 2.Qa7#
        • 2.Qb7#
      • 1...Bb3
        • 2.Qa7#
        • 2.Qb7#
      • 1...Bc4
        • 2.Rf8#
        • 2.Qc6#
        • 2.Qc8#
        • 2.Qe8#
        • 2.Qa7#
        • 2.Qb7#
        • 2.Qd8#
      • 1...Bd5
        • 2.Qa4#
        • 2.Qa7#
      • 1...Be8
        • 2.Qa7#
        • 2.Qb7#
      • 1...Rc7!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qa6#
      • 1...Rxc4
        • 2.Ra1#
      • 1...Bxc4
        • 2.Rf8#
      • 1...Ra2
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD,S_CUTB(c)::R(A)
    • B(c);OGATE::R(A)
  • Tries
    • Try
      • Q(D);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • R(a);::QAB1(D)
      • Refutation
        • R(a);P_PINQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR2(D)
    • Vars
      • R(a);N_GUARD,XQ(D)::R(A)
      • B(c);OGATE,XQ(D)::R(A)
      • R(a);N_GUARD::QAR2(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).