MESON Chess Problem Database

Problem Display
PID: 203311 (3QbN1K/4Pr1p/1n2Bk2/4ppp1/3P2q1/8/1b6/8 w - - 0 1)

Opitz, Emil

Kitzinger Arbeiter-schachklub, 1924

3QbN1K/4Pr1p/1n2Bk2/4ppp1/3P2q1/8/1b6/8

#2

6 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf8+
      • 2.exf8S#
    • 1...Ba4
      • 2.e8S#
    • 1...Bb5
      • 2.e8S#
    • 1...Bc6
      • 2.e8S#
    • 1...Bd7
      • 2.e8S#
  • Keys
    • 1.Qd6!
      • threat
        • 2.Ba2#
        • 2.Bb3#
        • 2.Bc4#
        • 2.Bd5#
        • 2.Bd7#
        • 2.Bc8#
      • 1...Rxf8+
        • 2.Bg8#
      • 1...Qxd4
        • 2.Bd5#
      • 1...Rxe7
        • 2.Qxe5#
      • 1...Rg7
        • 2.Ba2#
        • 2.Bb3#
        • 2.Bc4#
        • 2.Bd5#
        • 2.Bg8#
      • 1...Ba3
        • 2.dxe5#
      • 1...Bd7
        • 2.Bxd7#
      • 1...Sc4
        • 2.Bxc4#
      • 1...Sd5
        • 2.Bxd5#
        • 2.Bd7#
        • 2.Bc8#
      • 1...Sd7
        • 2.Ba2#
        • 2.Bb3#
        • 2.Bc4#
        • 2.Bd5#
        • 2.Bxd7#
      • 1...Sc8
        • 2.Bxc8#
      • 1...f4
        • 2.Bxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • R(h);CHECK,OGATE,XS(E)::PXR(h)=S
    • B(j);OGATE::P=S
  • Actual
    • Q(D);
    • Threat
      • DUALS(6)
    • Vars
      • R(h);CHECK,OGATE,XS(E)::QAR(D)+B(B)
      • Q(b);XP(A)::QAR(D)+B(B)
      • R(h);SBLOCK,XP(C)::QAB1(D),XP(c)
      • B(a);N_GUARD::P(A),XP(c)
      • B(j);::QAR(D)+B(B),XB(j)
      • S(f);::QAR(D)+B(B),XS(f)
      • P(d);OGATE::QAR(D)+B(B),XQ(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).