MESON Chess Problem Database

Problem Display
PID: 6525 (5k2/4p2K/8/5N1B/8/3q4/5Q2/8 w - - 0 1)

Lebedev, Viacheslav Aleksandr

Die Schwalbe, 1931

5k2/4p2K/8/5N1B/8/3q4/5Q2/8

#2

4 + 3

3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5+
      • 2.Qxf5#
    • 1...Qa6
      • 2.Sd6#
    • 1...Qa3
      • 2.Se3#
    • 1...Qe3
      • 2.Sxe3#
    • 1...Qg3
      • 2.Sxg3#
    • 1...Qd4
      • 2.Sxd4#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qd8
      • 2.Se3#
      • 2.Sg3#
      • 2.Sd4#
      • 2.Sh4#
      • 2.Sd6#
      • 2.Sh6#
      • 2.Sg7#
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qh6#
      • 1...Qxf5+
        • 2.Qxf5#
      • 1...Qa6
        • 2.Sd6#
      • 1...Qd2
        • 2.Se3#
      • 1...Qc3
        • 2.Sd4#
      • 1...Qe3
        • 2.Sxe3#
        • 2.Qb8#
      • 1...Qg3
        • 2.Sxg3#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qd6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(B)::QAR(A),XQ(a)
    • Q(a);N_PINS(B)::QAR(A)+S(B)
    • Q(a);N_PINS(B)::QAR(A)+S(B),XQ(a)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(B)::QAR(A),XQ(a)
      • Q(a);N_PINS(B)::QAR(A)+S(B)
      • Q(a);N_PINS(B)::QAR(A)+S(B),XQ(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).