MESON Chess Problem Database

Problem Display
PID: 132280 (4Q3/rR6/k1K5/4B3/8/n7/8/8 w - - 0 1)

Lebedev, Leonid Arsentevich

Narodnaya gazeta, 1998

4Q3/rR6/k1K5/4B3/8/n7/8/8

#2

4 + 3

145 StrateGems 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxa8#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Rxa7#
        • 2.Qxa3#
      • 1...Ka5
        • 2.Rxa7#
        • 2.Qxa3#
      • 1...Rxb7
        • 2.Qxa3#
      • 1...Sc4
        • 2.Rxa7#
      • 1...Ra8
        • 2.Qxa3#
      • 1...Sb1
        • 2.Rxa7#
      • 1...Sc2
        • 2.Rxa7#
      • 1...Sb5!
  • Keys
    • 1.Kc5!
      • 1...Ka5
        • 2.Rxa7#
      • 1...Kxb7
        • 2.Qc6#
      • 1...Rxb7
        • 2.Qa4#
      • 1...Ra8
        • 2.Qxa8#
      • 1...Sb1
        • 2.Qb5#
      • 1...Sc2
        • 2.Qb5#
      • 1...Sc4
        • 2.Qb5#
      • 1...Sb5
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATEB::QAR2(D),XR(c)
  • Tries
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);XR(C)::QAR(D),XS(a)
        • S(a);::R1(C),XR(c)
        • R(c);::QAR(D),XS(a)
      • Refutation
        • S(a);
  • Actual
    • K(B);P-FLIGHT
    • Vars
      • K(b);P-FLIGHT::R(C),XR(c)
      • K(b);S_FLIGHT,XR(C)::QAB1(D)
      • R(c);SBLOCK,XR(C)::QAR2(D)
      • R(c);OGATEB::QAR2(D),XR(c)
      • S(a);N_GUARD::QAB1(D)
      • S(a);N_GUARD::QAB1(D),XS(a)
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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).