MESON Chess Problem Database

Problem Display
PID: 207255 (3n4/3K4/8/1Np1knB1/2p1Pp1p/1Q1Pb1P1/8/8 w - - 0 1)

Lemke, Carl Fredrik

Schachzeitung, 1869

3n4/3K4/8/1Np1knB1/2p1Pp1p/1Q1Pb1P1/8/8

#2

7 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.gxf4#
    • 1...Bf2
      • 2.gxf4#
    • 1...Bd4
      • 2.gxf4#
    • 1...cxd3
      • 2.Qd5#
    • 1...c3
      • 2.Qd5#
  • Tries
    • 1.Qc3+?
      • 1...Bd4
        • 2.gxf4#
      • 1...Sd4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sf3#
      • 1...Kxd4
        • 2.Bf6#
      • 1...Bxd4
        • 2.gxf4#
      • 1...Sxd4
        • 2.Qb8#
      • 1...cxd3
        • 2.Qd5#
      • 1...cxd4
        • 2.Qb5#
      • 1...f3
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::P(C),XP(c)
    • P(b);OGATE,XP(B)::QAR1(A)
    • P(b);OGATE::QAR1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • B(a);P_SPINB(a)::P(C),XP(c)
      • Refutation
        • S(g);P_SPINS(g)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(f);S_FLIGHT,XS(E)::B(F)
      • B(a);N_GUARD,SBLOCK,XS(E)::P(C),XP(c)
      • S(g);N_GUARD,SBLOCK,XS(E)::QAB(A)
      • P(b);OGATE,XP(B)::QAR1(A)
      • P(e);OGATEB,SBLOCK,XS(E)::QAR(A)
      • P(c);::S(E),XP(c)
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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).