MESON Chess Problem Database

Problem Display
PID: 265589 (8/1p6/r1p3QR/3kP3/BP1P4/1P2p1b1/3n4/B1K5 w - - 0 1)

Laib, Kurt Friedrich

Die Schwalbe, 1972

8/1p6/r1p3QR/3kP3/BP1P4/1P2p1b1/3n4/B1K5

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb3+
      • 2.Bxb3#
    • 1...Se4
      • 2.Qf7#
      • 2.Qe6#
      • 2.Qg8#
    • 1...b6
      • 2.Bxc6#
      • 2.Qxc6#
  • Tries
    • 1.Qf5?
      • threat
        • 2.Rd6#
      • 1...Sxb3+
        • 2.Bxb3#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Sc4
        • 2.Qf3#
      • 1...Se4
        • 2.Qe6#
        • 2.Qf7#
      • 1...c5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Rd6#
      • 1...Sxb3+
        • 2.Bxb3#
      • 1...Bxe5
        • 2.dxe5#
      • 1...Sc4
        • 2.bxc4#
      • 1...Se4
        • 2.Qc4#
      • 1...c5
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,OGATE,XP(C)::B(D),XS(a)
  • Tries
    • Try
      • Q(H);
      • Threat
        • R1(I)
      • Vars
        • S(a);CHECK,OGATE,XP(C)::B(D),XS(a)
        • B(c);OGATE,P_SPINB(c),XP(G)::QAR1(H),XB(c)
        • S(a);N_GUARD::QAB(H)
      • Refutation
        • P(f);
  • Actual
    • Q(H);
    • Threat
      • R1(I)
    • Vars
      • S(a);CHECK,OGATE,XP(C)::B(D),XS(a)
      • B(c);OGATE,XP(G)::QAR(H)+P(F),XB(c)
      • S(a);OGATE::P(C),XS(a)
      • S(a);N_GUARD,SBLOCK::QAB1(H)
      • P(f);OGATE::QAR(H)+P(F),XP(f)
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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).