MESON Chess Problem Database

Problem Display
PID: 66171 (8/3p4/2pB4/2p1n2K/2PkP3/rQNPp3/4p3/3bN1R1 w - - 0 1)

le Grand, Henk

le Grand, Piet

Jaarboek, 1958

8/3p4/2pB4/2p1n2K/2PkP3/rQNPp3/4p3/3bN1R1

#2

9 + 9

702 Phenix 1989

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Sxe2#
    • 1...Bxb3
      • 2.Sxe2#
    • 1...Sxd3
      • 2.Sf3#
    • 1...Sxc4
      • 2.Qxc4#
  • Tries
    • 1.Sc2+?
      • 1...Bxc2
        • 2.Sxe2#
      • 1...Kxd3!
    • 1.Sa4?
      • threat
        • 2.Bxc5#
      • 1...Rxa4
        • 2.Qb2#
      • 1...Sxc4
        • 2.Sf3#
        • 2.Qxc4#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sg4
        • 2.Sf3#
      • 1...Sg6
        • 2.Sf3#
      • 1...Sf7
        • 2.Sf3#
      • 1...Sxd3!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Bxe5#
      • 1...Sxd3
        • 2.Sf3#
      • 1...Sxc4
        • 2.Bxc5#
        • 2.Qxc4#
      • 1...Sf3
        • 2.Bxc5#
      • 1...Sg4
        • 2.Bxc5#
      • 1...Sg6
        • 2.Bxc5#
      • 1...Sf7
        • 2.Bxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::S(D),XP(b)
    • B(a);N_GUARD,XQ(C)::S(D),XP(b)
    • S(g);N_GUARD,SBLOCK,XP(E)::S(A)
    • S(g);OGATE,XP(F)::QAR1(C),XS(g)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • B(a);XS(A)::S(D),XP(b)
      • Refutation
        • K(e);P-FLIGHT,XP(E)
    • Try
      • S(D);
      • Threat
        • B(I),XP(f)
      • Vars
        • R(c);N_GUARD,XS(D)::QAB(C)
        • S(g);N_GUARD::S(A),XS(g)
        • S(g);N_GUARD::S(A)
      • Refutation
        • S(g);XP(E)
  • Actual
    • R(B);
    • Threat
      • B(I),XS(g)
    • Vars
      • S(g);N_GUARD,SBLOCK,XP(E)::S(A)
      • S(g);::B(I),XP(f)
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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).