MESON Chess Problem Database

Problem Display
PID: 249 (3Q4/8/pp6/kpR1rn2/4p3/PP6/8/1n2K3 w - - 0 1)

Mikan, Ilja

Straz lidu, 1950

3Q4/8/pp6/kpR1rn2/4p3/PP6/8/1n2K3

#2

5 + 8

5505 Dobrodruzstvi 64 poli 1973

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxd2#
    • 1...Sxa3
      • 2.Qd2#
  • Tries
    • 1.Qd2+?
      • 1...Sc3
        • 2.Qxc3#
      • 1...Sxd2!
    • 1.Qd4?
      • threat
        • 2.Qa4#
        • 2.Qb4#
      • 1...Rxc5
        • 2.Qb4#
      • 1...Sxa3
        • 2.Qc3#
        • 2.Qd2#
        • 2.Qa4#
      • 1...bxc5
        • 2.Qd8#
      • 1...Sc3
        • 2.Qxc3#
        • 2.Qb4#
      • 1...Sxd4!
  • Keys
    • 1.Qd1!
      • threat
        • 2.b4#
      • 1...Sxa3
        • 2.Qd2#
      • 1...bxc5
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAB(E),XS(a)
    • S(a);N_GUARD,XP(B)::QAB(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(E),XS(a)
      • Refutation
        • S(a);XQ(E)
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);N_SPINP(d),XR(D)::QAB1(E)
        • P(h);N_SPINP(d),OGATEB,XR(D)::QAB(E)
      • Refutation
        • S(f);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • P(C)
    • Vars
      • S(a);N_GUARD,XP(B)::QAB(E)
      • P(h);N_SPINP(d),OGATEB,XR(D)::QAB(E)
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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).