MESON Chess Problem Database

Problem Display
PID: 166027 (1K2b1Nb/3N2B1/3pkPP1/3nPp2/2Q3B1/8/8/8 w - - 0 1)

Karlstrom, Alfred Olaf

1st Prize, Problemisten, 1947/I

1K2b1Nb/3N2B1/3pkPP1/3nPp2/2Q3B1/8/8/8

#2

9 + 6

23 Die Schwalbe 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd7
      • 2.Qc8#
    • 1...fxg4
      • 2.Qxg4#
    • 1...dxe5
      • 2.Qc6#
  • Tries
    • 1.Se7?
      • threat
        • 2.Bxf5#
      • 1...Kxd7
        • 2.Qc8#
      • 1...Bxd7
        • 2.Qxd5#
      • 1...fxg4
        • 2.Qxg4#
      • 1...dxe5
        • 2.Qxd5#
        • 2.Qc6#
      • 1...Bxg6!
    • 1.Qxd5+?
      • 1...Kxd7
        • 2.Qxd6#
      • 1...Kxd5!
  • Keys
    • 1.f7!
      • threat
        • 2.Sf8#
        • 2.fxe8Q#
        • 2.f8S#
      • 1...Kxd7
        • 2.Qc8#
      • 1...Bxd7
        • 2.f8S#
      • 1...Bxf7
        • 2.Sf8#
      • 1...Bxg7
        • 2.fxe8Q#
      • 1...fxg4
        • 2.Qxg4#
      • 1...dxe5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINS(a),OGATEB,S_FLIGHT,XS(F)::QAB1(A)
    • P(b);N_SPINP(b),OGATE,XB(B)::QAB(A),XP(b)
    • P(c);OGATEB,XP(C)::QAR2(A)
  • Tries
    • Try
      • S(I);
      • Threat
        • B(B),XP(b)
      • Vars
        • K(d);N_SPINS(a),OGATEB,S_FLIGHT,XS(F)::QAB1(A)
        • B(e);SBLOCK,XS(F)::QAB1(A),XS(a)
        • P(b);N_SPINP(b),OGATE,XB(B)::QAB(A),XP(b)
      • Refutation
        • B(e);XP(E)
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • K(d);S_FLIGHT,XS(F)::QAR1(A),XP(c)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT,XQ(A)
  • Actual
    • P(D);
    • Threat
      • DUALS(3)
    • Vars
      • K(d);N_SPINS(a),OGATEB,S_FLIGHT,XS(F)::QAB1(A)
      • B(e);XS(F)::P=S
      • B(e);XP(D)::S(F)
      • B(f);XB(G)::PXB(e)=Q
      • P(b);N_SPINP(b),OGATE,XB(B)::QAB(A),XP(b)
      • P(c);OGATEB,XP(C)::QAR2(A)
HTML5 logo

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).