MESON Chess Problem Database

Problem Display
PID: 262525 (1B1Qn3/N2bp3/R3Nb2/K1pkp1pR/1p4P1/1p1B1P2/1P6/8 w - - 0 1)

Hjelle, David

Europe Echecs, 1971

1B1Qn3/N2bp3/R3Nb2/K1pkp1pR/1p4P1/1p1B1P2/1P6/8

#2

11 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sc7
      • 2.Qxd7#
    • 1...Sg7
      • 2.Qxd7#
    • 1...c4
      • 2.Be4#
    • 1...e4
      • 2.fxe4#
  • Tries
    • 1.Sc7+?
      • 1...Sxc7
        • 2.Qxd7#
      • 1...Kd4!
    • 1.Sc8?
      • 1...Bg7
        • 2.Sxe7#
      • 1...Bh8
        • 2.Sxe7#
      • 1...Sc7
        • 2.Qxd7#
      • 1...Sg7
        • 2.Qxd7#
      • 1...c4
        • 2.Be4#
      • 1...e4
        • 2.fxe4#
      • 1...Sd6!
  • Keys
    • 1.Sc6!
      • 1...Kxe6
        • 2.Bc4#
      • 1...Sc7
        • 2.Qxd7#
      • 1...Bg7
        • 2.Sxe7#
      • 1...Bh8
        • 2.Sxe7#
      • 1...Sd6
        • 2.Sc7#
      • 1...Sg7
        • 2.Qxd7#
      • 1...c4
        • 2.Sxb4#
      • 1...e4
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(j);N_GUARD::QAR2(K),XB(h)
    • P(c);SBLOCK::B(B)
    • P(e);OGATE,P_SPINP(f)::P(C),XP(e)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • S(j);XS(H)::QAR2(K),XB(h)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • S(I);
      • Vars
        • B(g);N_GUARD::S(I),XP(i)
        • S(j);N_GUARD::QAR2(K),XB(h)
        • P(c);SBLOCK::B(B)
        • P(e);OGATE,P_SPINP(f)::P(C),XP(e)
      • Refutation
        • S(j);N_SPINB(h)
  • Actual
    • S(I);
    • Vars
      • K(d);N_GUARD,N_SPINB(h),S_FLIGHT,XS(H)::B(B)
      • S(j);N_GUARD::QAR2(K),XB(h)
      • B(g);N_GUARD::S(I),XP(i)
      • S(j);N_GUARD,N_SPINB(h),SBLOCK::S(H)
      • P(c);N_GUARD::S(I),XP(b)
      • P(e);N_GUARD,P_SPINP(f)::S(H)
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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).