MESON Chess Problem Database

Problem Display
PID: 158992 (qnN2b1B/5P1Q/4k1P1/p7/B2pb1K1/8/8/2R1R3 w - - 0 1)

Junker, Karl

1st Prize, Hamburger Problem-Nachrichten, 1948

qnN2b1B/5P1Q/4k1P1/p7/B2pb1K1/8/8/2R1R3

#2

9 + 7

15529 Karl Junker: Ausgewahlte Schachaufgaben 1978

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Bb3#
  • Tries
    • 1.Rxe4+?
      • 1...Kd5
        • 2.Re5#
      • 1...Qxe4+!
    • 1.Qh5?
      • threat
        • 2.Qe5#
        • 2.Qf5#
      • 1...Qc6
        • 2.Qf5#
      • 1...Bg7
        • 2.Qf5#
      • 1...Sc6
        • 2.Qf5#
      • 1...Bd6
        • 2.Qf5#
      • 1...Sd7
        • 2.Qf5#
      • 1...Qd5!
  • Keys
    • 1.g7!
      • threat
        • 2.Qf5#
      • 1...Kd5
        • 2.Qxe4#
      • 1...Ke5
        • 2.Qf5#
      • 1...Kf6
        • 2.gxf8S#
      • 1...Kxf7
        • 2.g8Q#
        • 2.g8B#
      • 1...Qd5
        • 2.gxf8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINB(b),S_FLIGHT::B(C)
  • Tries
    • Try
      • R(B);CHECK,XB(b)
      • Vars
        • K(d);S_FLIGHT::R1(B)
      • Refutation
        • Q(e);CHECK,XR(B)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);::QAB1(G)
        • B(g);::QAB1(G)
        • S(f);::QAB1(G)
      • Refutation
        • Q(e);
  • Actual
    • P(E);
    • Threat
      • QAB1(G)
    • Vars
      • K(d);N_SPINB(b),S_FLIGHT::QAB1(G),XB(b)
      • K(d);P-FLIGHT::QAR1(G)
      • K(d);N_SPINB(b),P-FLIGHT::PXB(g)=S
      • K(d);N_SPINB(b),S_FLIGHT,XP(F)::P=Q
      • Q(e);SBLOCK::PXB(g)=S
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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).