MESON Chess Problem Database

Problem Display
PID: 102158 (q3b2r/1p1PQ3/prkN2p1/pR6/p7/3K1p2/8/8 w - - 0 1)

Scheel, Johan

Hvar a Dag, 1915

q3b2r/1p1PQ3/prkN2p1/pR6/p7/3K1p2/8/8

#2

5 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc7
      • 2.dxe8Q#
    • 1...Qa7
      • 2.d8S#
    • 1...Qc8
      • 2.dxc8Q#
      • 2.dxc8R#
  • Tries
    • 1.Se4?
      • threat
        • 2.Rc5#
      • 1...Kxb5
        • 2.Qc5#
      • 1...Kc7
        • 2.dxe8Q#
      • 1...Rxb5
        • 2.Qd6#
      • 1...axb5
        • 2.Qd6#
      • 1...Rh5!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Rc5#
      • 1...Kxb5
        • 2.Sd4#
      • 1...Kc7
        • 2.dxe8Q#
      • 1...Rxb5
        • 2.Qd6#
      • 1...axb5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(f);P-FLIGHT::PXB(j)=Q
    • Q(i);N_GUARD::P=S
    • Q(i);OGATE::PXQ(i)=Q
  • Tries
    • Try
      • S(C);
      • Threat
        • R1(B)
      • Vars
        • K(f);S_FLIGHT,XR(B)::QAR1(E)
        • K(f);P-FLIGHT::PXB(j)=Q
        • R(e);SBLOCK,XR(B)::QAR1(E)
        • P(d);SBLOCK,XR(B)::QAR1(E)
      • Refutation
        • R(k);
  • Actual
    • S(C);
    • Threat
      • R1(B)
    • Vars
      • K(f);S_FLIGHT,XR(B)::S(C)
      • K(f);P-FLIGHT::PXB(j)=Q
      • R(e);SBLOCK,XR(B)::QAR1(E)
      • P(d);SBLOCK,XR(B)::QAR1(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).