MESON Chess Problem Database

Problem Display
PID: 242602 (2R5/2N5/BPbp4/1Rq5/P1k1PQ2/p3n3/KBP5/6b1 w - - 0 1)

Lider, Valentin Viktorovich

Tidskrift for Schack, 1979

2R5/2N5/BPbp4/1Rq5/P1k1PQ2/p3n3/KBP5/6b1

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.exd5#
    • 1...Sd1
      • 2.Qf1#
    • 1...Sf1
      • 2.Qxf1#
    • 1...Sxc2
      • 2.Qf1#
    • 1...Sg2
      • 2.Qf1#
    • 1...Sg4
      • 2.Qf1#
    • 1...Sd5
      • 2.Qf1#
    • 1...Sf5
      • 2.Qf1#
  • Tries
    • 1.e5+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Be4!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Rb4#
      • 1...Qxb6
        • 2.Sxb6#
      • 1...Qxb5
        • 2.Rxc6#
      • 1...Qxd5
        • 2.exd5#
      • 1...Bxb5
        • 2.Bxb5#
      • 1...Bxd5
        • 2.Rb3#
      • 1...Sxd5
        • 2.Qf1#
      • 1...Qb4
        • 2.e5#
      • 1...Qd4
        • 2.Ra5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • Q(e);OGATE::QAR(F)+P(E),XQ(e)
    • S(c);N_GUARD::QAB(F)
    • S(c);N_GUARD::QAB(F),XS(c)
    • S(c);N_GUARD,XP(C)::QAB(F)
  • Tries
    • Try
      • P(E);CHECK
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e)::QAR1(F),XQ(e)
      • Refutation
        • B(f);P_SPINB(f)
  • Actual
    • S(J);
    • Threat
      • B(H)+R(G),DCHECK
    • Vars
      • Q(e);P_SPINB(f),XP(I)::S(J),XQ(e)
      • Q(e);OGATEB,P_SPINB(f),P_SPINQ(e),XR(G)::R(K),XB(f)
      • Q(e);OGATE,P_SPINB(f),XS(J)::QAR(F)+P(E),XQ(e)
      • B(f);OGATE,P_SPINB(f),P_SPINQ(e),XR(G)::B(H),XB(f)
      • B(f);N_GUARD,P_SPINQ(e),XS(J)::B(H)+R(G)
      • S(c);N_GUARD,XS(J)::QAB(F)
      • Q(e);N_GUARD,P_SPINB(f)::QAR(F)+P(E)
      • Q(e);N_GUARD,P_SPINB(f)::B(H)+R(G)
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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).