MESON Chess Problem Database

Problem Display
PID: 176308 (b7/B7/p1pN4/k1N5/1p4Q1/2n5/8/5K2 w - - 0 1)

Limbach, Saturnin

Schach-Echo, 1973

b7/B7/p1pN4/k1N5/1p4Q1/2n5/8/5K2

#2

5 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sa4
      • 2.Sb3#
    • 1...Sb5
      • 2.Sc4#
    • 1...b3
      • 2.Sxb3#
  • Tries
    • 1.Qc8?
      • threat
        • 2.Qxa6#
        • 2.Qc7#
        • 2.Qd8#
      • 1...Bb7
        • 2.Qc7#
        • 2.Qd8#
      • 1...Sa4
        • 2.Sb3#
        • 2.Qxa6#
      • 1...Sb5
        • 2.Sc4#
        • 2.Qxa6#
      • 1...Sd5
        • 2.Qxa6#
      • 1...b3!
    • 1.Qc4?
      • threat
        • 2.Qxa6#
      • 1...Bb7
        • 2.Sdxb7#
      • 1...b3
        • 2.Sxb3#
        • 2.Qxc3#
      • 1...Sb5!
    • 1.Qh4?
      • threat
        • 2.Qd8#
      • 1...Sa4
        • 2.Sb3#
      • 1...Sb5
        • 2.Sc4#
      • 1...b3
        • 2.Sxb3#
      • 1...Sd5!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qc7#
      • 1...b3
        • 2.Qxc3#
      • 1...Sa4
        • 2.Sb3#
      • 1...Sb5
        • 2.Sc4#
      • 1...Sd5
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);SBLOCK::S(C)
    • S(a);SBLOCK::S(D)
    • P(b);::S(C),XP(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);::QAR1(B),XP(d)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(d)
      • Vars
        • B(f);N_GUARD::S(D),XB(f)
      • Refutation
        • S(a);
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • S(a);SBLOCK::S(C)
        • S(a);SBLOCK::S(D)
        • P(b);::S(C),XP(b)
      • Refutation
        • S(a);
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • P(b);OGATEB::QAB(B),XS(a)
      • S(a);SBLOCK::S(C)
      • S(a);SBLOCK::S(D)
      • S(a);OGATE::QAR(B)
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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).