MESON Chess Problem Database

Problem Display
PID: 249635 (qN3rnn/2pb1Np1/R3pkrp/1pQp2p1/3R4/B3p2B/8/1K6 w - - 0 1)

Hjelle, David

Stella Polaris, 1969

qN3rnn/2pb1Np1/R3pkrp/1pQp2p1/3R4/B3p2B/8/1K6

#2

8 + 15

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf7
      • 2.Qxf8#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sxf7
      • 2.Sxd7#
    • 1...g4
      • 2.Rf4#
  • Tries
    • 1.Rxe6+?
      • 1...Kxf7
        • 2.Qxf8#
      • 1...Bxe6!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Rf1#
      • 1...Kxf7
        • 2.Qxf8#
      • 1...Rxf7
        • 2.Qd4#
      • 1...Sxf7
        • 2.Sxd7#
      • 1...Se7
        • 2.Qxe7#
      • 1...e2
        • 2.Qf2#
      • 1...d4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(f);N_SPINP(e),OGATEB,P-FLIGHT,XS(G)::QAR1(E),XR(m)
    • S(n);N_GUARD::QAB1(E),XS(n)
    • S(o);SBLOCK,XS(G)::S(H),XB(j)
    • P(d);N_GUARD::R(D)
  • Tries
    • Try
      • R(F);CHECK,XP(e)
      • Vars
        • K(f);P-FLIGHT,XS(G)::QAR1(E),XR(m)
      • Refutation
        • B(j);XR(F)
  • Actual
    • R(D);
    • Threat
      • R(D)
    • Vars
      • K(f);N_SPINP(e),OGATEB,P-FLIGHT,XS(G)::QAR1(E),XR(m)
      • R(m);SBLOCK,XS(G)::QAB(E)
      • S(o);SBLOCK,XS(G)::S(H),XB(j)
      • S(n);N_GUARD::QAB1(E),XS(n)
      • P(a);OGATE::QAR(E)
      • P(c);OGATE::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).