MESON Chess Problem Database

Problem Display
PID: 144044 (5NrB/2Q1R2B/5Pq1/K2p4/1N1k2n1/1P3rR1/5P2/4n3 w - - 0 1)

Birnov, Zinovy Markovich

Magyar Sakkvilag, 1930

5NrB/2Q1R2B/5Pq1/K2p4/1N1k2n1/1P3rR1/5P2/4n3

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Se6#
    • 1...Qc2
      • 2.Se6#
    • 1...Qd3
      • 2.Se6#
    • 1...Qh5
      • 2.Se6#
    • 1...Qe8
      • 2.Se6#
    • 1...Qg5
      • 2.Se6#
    • 1...Qxf6
      • 2.Se6#
    • 1...Qh6
      • 2.Se6#
    • 1...Qg7
      • 2.Se6#
    • 1...Rxf2
      • 2.Qb6#
      • 2.Qc3#
      • 2.Qa7#
    • 1...Rc3
      • 2.Qxc3#
    • 1...Rf4
      • 2.Qb6#
      • 2.Qc3#
      • 2.Qa7#
    • 1...Rf5
      • 2.Qb6#
      • 2.Qc3#
      • 2.Qa7#
    • 1...Rxf6
      • 2.Qb6#
      • 2.Qc3#
      • 2.Qa7#
    • 1...Sd3
      • 2.Sc2#
  • Tries
    • 1.Qe5+?
      • 1...Kc5
        • 2.Se6#
        • 2.Sd7#
        • 2.Rc7#
        • 2.Qxd5#
      • 1...Sxe5!
  • Keys
    • 1.Kb6!
      • threat
        • 2.Qc5#
      • 1...Qxf6+
        • 2.Se6#
      • 1...Rxf6+
        • 2.Sc6#
      • 1...Se5
        • 2.Qxe5#
      • 1...Qc2
        • 2.Se6#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Sd3
        • 2.Sc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(f);::S(J)
    • Q(f);P_SPINQ(f),XP(F)::S(J)
    • R(b);N_GUARD::QAB1(G),XR(b)
    • S(a);N_GUARD,SBLOCK,S_CUTQ(f)::S(D)
  • Tries
    • Try
      • Q(G);CHECK
      • Refutation
        • S(d);XQ(G)
  • Actual
    • K(E);P_SPINP(F),S_FLIGHT
    • Threat
      • QAB1(G)
    • Vars
      • Q(f);CHECK,P_SPINQ(f),XP(F)::S(J)
      • R(b);CHECK,P_SPINR(b),XP(F)::S(D)
      • S(d);N_GUARD::QAB1(G),XS(d)
      • Q(f);N_PINP(F)::S(J)
      • R(b);N_GUARD::QAB1(G),XR(b)
      • S(a);N_GUARD,SBLOCK,S_CUTQ(f)::S(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).