MESON Chess Problem Database

Problem Display
PID: 53108 (1B2K1B1/r2pP3/bp1P1p2/2k1qR2/1N6/2NpP3/3P4/1QR5 w - - 0 1)

Laib, Kurt Friedrich

1st Prize, Schach-Echo, 1933

1B2K1B1/r2pP3/bp1P1p2/2k1qR2/1N6/2NpP3/3P4/1QR5

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bb5
      • 2.Sa4#
      • 2.Se4#
    • 1...b5
      • 2.Sa4#
  • Tries
    • 1.Sxd3+?
      • 1...Bxd3
        • 2.Sa4#
        • 2.Se4#
      • 1...Kc6!
    • 1.Sxa6+?
      • 1...Rxa6
        • 2.Sd1#
        • 2.Sa2#
        • 2.Se2#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sb5#
        • 2.Qb5#
      • 1...Kc6!
  • Keys
    • 1.Sbd5!
      • threat
        • 2.Sa4#
        • 2.Se4#
      • 1...Qxe7+
        • 2.Sxe7#
      • 1...Kc4
        • 2.Qb4#
      • 1...Kc6
        • 2.Qxb6#
      • 1...Qxc3
        • 2.Sb4#
      • 1...Qxe3
        • 2.Sb5#
      • 1...Rc7
        • 2.Se4#
      • 1...Bc4
        • 2.Qxb6#
      • 1...Qe4
        • 2.Sa4#
        • 2.Sxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • P(e);SBLOCK::R(B)+S(D),DCHECK
  • Tries
    • Try
      • S(F);CHECK,XP(a)
      • Refutation
        • K(b);N_SPINQ(c),P-FLIGHT
    • Try
      • S(F);CHECK,XB(d)
      • Refutation
        • K(b);N_SPINQ(c),P-FLIGHT
  • Actual
    • S(F);N_PINQ(c)
    • Threat
      • DUALS(2)
    • Vars
      • Q(c);CHECK,XP(I)::R(G)+S(F),XQ(c)
      • K(b);P-FLIGHT::QAR1(A)
      • K(b);P-FLIGHT::QAR1(A),XP(e)
      • Q(c);N_PINP(I),P_SPINQ(c),XS(D)::R(G)+S(F)
      • Q(c);N_GUARD,XP(E)::R(B)+S(D)
      • R(g);::R(B)+S(D),DCHECK
      • B(d);SBLOCK::QAB1(A),XP(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).