MESON Chess Problem Database

Problem Display
PID: 271160 (8/4N3/4N3/6bk/5p2/5K2/8/4Q3 w - - 0 1)

Lebedev, Viacheslav Aleksandr

Die Schwalbe, 1931

8/4N3/4N3/6bk/5p2/5K2/8/4Q3

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Bh6
      • 2.Qh1#
  • Tries
    • 1.Qe5?
      • threat
        • 2.Qxg5#
      • 1...Kh6
        • 2.Qh8#
      • 1...Kh4!
  • Keys
    • 1.Qb1!
      • 1...Kh4
        • 2.Qh1#
      • 1...Kh6
        • 2.Qg6#
      • 1...Bxe7
        • 2.Qh7#
      • 1...Bh4
        • 2.Qg6#
        • 2.Qh7#
      • 1...Bf6
        • 2.Qh7#
      • 1...Bh6
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD,SBLOCK::QAR(A)
  • Tries
    • Try
      • Q(A);P_PINB(b)
      • Threat
        • QAR1(A),XB(b)
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,S_CUTB(b)::QAR2(A)
      • Refutation
        • K(c);N_SPINB(b),P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(c);P-FLIGHT,S_CUTB(b)::QAR(A)
      • K(c);N_GUARD,P-FLIGHT::QAR1(A)
      • B(b);N_GUARD,XS(D)::QAR2(A)
      • B(b);N_GUARD::QAR2(A)
      • B(b);N_GUARD,SBLOCK::QAR(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).