MESON Chess Problem Database

Problem Display
PID: 89760 (8/4Q3/4NPp1/6n1/3P1RBk/5P1P/7K/8 w - - 0 1)

Touw Hian Bwee

Die Schwalbe, 1976

8/4Q3/4NPp1/6n1/3P1RBk/5P1P/7K/8

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf3+
      • 2.Bxf3#
    • 1...Sxh3
      • 2.Qh7#
    • 1...Se4
      • 2.Qh7#
    • 1...Sh7
      • 2.Qxh7#
  • Tries
    • 1.Qf8?
      • threat
        • 2.Qh6#
      • 1...Sxf3+
        • 2.Bxf3#
      • 1...Sf7!
    • 1.Qg7?
      • threat
        • 2.Qh6#
      • 1...Sxf3+
        • 2.Bxf3#
      • 1...Sf7!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxg5#
      • 1...Sxf3+
        • 2.Bxf3#
      • 1...Sxh3
        • 2.Bxh3#
      • 1...Sxe6
        • 2.Bxe6#
      • 1...Sf7
        • 2.Bh5#
      • 1...Se4
        • 2.Bh5#
      • 1...Sh7
        • 2.Bh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);CHECK,OGATE,XP(B)::R(E)+B(F),XS(b)
    • S(b);N_GUARD,XP(C)::QAR(I)
    • S(b);N_GUARD::QAR(I)
    • S(b);N_GUARD::QAR(I),XS(b)
  • Tries
    • Try
      • Q(I);
      • Threat
        • QAR2(I)
      • Vars
        • S(b);CHECK,OGATE,XP(B)::R(E)+B(F),XS(b)
      • Refutation
        • S(b);
    • Try
      • Q(I);
      • Threat
        • QAR2(I)
      • Vars
        • S(b);CHECK,OGATE,XP(B)::R(E)+B(F),XS(b)
      • Refutation
        • S(b);
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XS(b)
    • Vars
      • S(b);CHECK,OGATE,XP(B)::R(E)+B(F),XS(b)
      • S(b);OGATE,XP(C)::R(E)+B(F),XS(b)
      • S(b);OGATE,XS(G)::R(E)+B(F),XS(b)
      • S(b);::R(E)+B(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).