MESON Chess Problem Database

Problem Display
PID: 261634 (K3Q3/3R1R2/4B3/8/1nPPk1Pn/4b3/4P3/8 w - - 0 1)

Hermanson, Halvar

3rd HM., Schweizerische Schachzeitung, 1979

K3Q3/3R1R2/4B3/8/1nPPk1Pn/4b3/4P3/8

#2

9 + 4

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd4
      • 2.Bd5#
    • 1...Bf4
      • 2.Bf5#
  • Tries
    • 1.Rf4+?
      • 1...Bxf4
        • 2.Bf5#
      • 1...Kxf4!
    • 1.Qh8?
      • threat
        • 2.Qe5#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Sd3
        • 2.Bd5#
      • 1...Sc6
        • 2.Bd5#
      • 1...Sf3
        • 2.Qh7#
      • 1...Sg6
        • 2.Qh1#
      • 1...Bf4!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qe5#
      • 1...Bxd4
        • 2.Qf4#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Sd3
        • 2.Qb7#
      • 1...Sc6
        • 2.Qb1#
      • 1...Sf3
        • 2.Bf5#
      • 1...Sg6
        • 2.Bf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK,XP(C)::QAR(I)+B(E),DCHECK
    • B(a);SBLOCK::QAR(I)+B(E),DCHECK
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • B(a);SBLOCK,XR(G)::QAR(I)+B(E),DCHECK
      • Refutation
        • K(c);P-FLIGHT,XR(G)
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • B(a);OGATE,XP(C)::QAR1(I),XB(a)
        • S(b);N_GUARD::B(E)
        • S(d);N_GUARD::QAB(I)
        • S(d);OGATE::QAB(I)
      • Refutation
        • B(a);
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • B(a);N_GUARD,XP(C)::QAR1(I)
      • B(a);N_GUARD::QAR1(I),XB(a)
      • S(b);N_GUARD::QAB(I)
      • S(b);OGATE::QAB(I)
      • S(d);N_GUARD::B(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).