MESON Chess Problem Database

Problem Display
PID: 262516 (B1bqR3/Nn6/Q7/b1pP1n1R/3kpB1r/3Np2p/2K5/8 w - - 0 1)

Hjelle, David

Europe Echecs, 1976

B1bqR3/Nn6/Q7/b1pP1n1R/3kpB1r/3Np2p/2K5/8

#2

9 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Sc6#
    • 1...Sfd6
      • 2.Sc6#
    • 1...Sh6
      • 2.Sc6#
    • 1...Sg7
      • 2.Sc6#
    • 1...Sbd6
      • 2.Be5#
    • 1...exd3+
      • 2.Qxd3#
  • Tries
    • 1.Rxe4+?
      • 1...Kxd5
        • 2.Qc4#
        • 2.Qc6#
      • 1...Kxe4!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Qc4#
      • 1...Kxd5
        • 2.Qc4#
      • 1...Qxd5
        • 2.Sb5#
      • 1...c4
        • 2.Qxc4#
      • 1...Sfd6
        • 2.Sc6#
      • 1...Sbd6
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • S(h);::S(G)
    • S(i);::B(C)
    • P(d);CHECK,OGATE,XS(B)::QAR1(F),XP(d)
  • Tries
    • Try
      • R(I);CHECK,XP(d)
      • Refutation
        • K(c);P-FLIGHT,XR(I)
  • Actual
    • S(B);
    • Threat
      • QAR1(F)
    • Vars
      • K(c);P-FLIGHT,P_SPINS(h),XP(D)::QAB1(F)
      • Q(k);SBLOCK,XP(D)::S(G)
      • P(g);::QAR1(F),XP(g)
      • S(h);::S(G)
      • S(i);::B(C)
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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).