MESON Chess Problem Database

Problem Display
PID: 241402 (5B2/2q5/2rn2N1/1p1kpB1R/2prN3/2b5/3p1QK1/8 w - - 0 1)

Hjelle, David

Arbejder-Skak, 1949

5B2/2q5/2rn2N1/1p1kpB1R/2prN3/2b5/3p1QK1/8

#2

7 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Se7#
    • 1...Qb6
      • 2.Se7#
    • 1...Qb8
      • 2.Se7#
    • 1...Qe7
      • 2.Sxe7#
    • 1...Qc8
      • 2.Se7#
    • 1...Rd3
      • 2.Sf6#
    • 1...Sb7
      • 2.Sxc3#
    • 1...Sf7
      • 2.Sxc3#
    • 1...Sc8
      • 2.Sxc3#
    • 1...Se8
      • 2.Sxc3#
  • Tries
    • 1.Be6+?
      • 1...Kxe4
        • 2.Qe2#
        • 2.Qf3#
      • 1...Kxe6!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Rxe5#
      • 1...Kxe4
        • 2.Qf3#
      • 1...Rxe4
        • 2.Se7#
      • 1...Sxe4
        • 2.Sf4#
      • 1...Rd3
        • 2.Sf6#
      • 1...Sf5
        • 2.Sxc3#
      • 1...Sb7
        • 2.Sxc3#
      • 1...Sf7
        • 2.Sxc3#
      • 1...Sc8
        • 2.Sxc3#
      • 1...Se8
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(j);N_GUARD::S(F)
    • Q(j);N_GUARD::S(F),XQ(j)
    • R(d);::S(C)
    • S(i);::S(C),XB(b)
  • Tries
    • Try
      • B(D);CHECK,P_PINP(g)
      • Refutation
        • K(f);N_SPINP(g),S_FLIGHT,XB(D)
  • Actual
    • B(D);P_PINP(g)
    • Threat
      • R1(E),XP(g)
    • Vars
      • K(f);N_SPINP(g),OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • R(d);SBLOCK,XS(C)::S(F)
      • S(i);SBLOCK,XS(C)::S(F)
      • R(d);::S(C)
      • S(i);N_SPINP(g)::S(C),XB(b)
      • S(i);::S(C),XB(b)
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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).