MESON Chess Problem Database

Problem Display
PID: 49152 (1qBN4/1p6/1Np4b/6pQ/R2Pk3/6P1/2K2P1n/2n5 w - - 0 1)

Duverge, Josef FA

Op de Hoogte, 1907

1qBN4/1p6/1Np4b/6pQ/R2Pk3/6P1/2K2P1n/2n5

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qe2#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sb3
      • 2.Qe2#
    • 1...Sd3
      • 2.Qe2#
    • 1...Sf1
      • 2.Qh1#
    • 1...Sf3
      • 2.Qg6#
    • 1...Sg4
      • 2.Qh1#
    • 1...g4
      • 2.Qf5#
  • Tries
    • 1.Qg4+?
      • 1...Qf4
        • 2.Bf5#
      • 1...Sxg4!
  • Keys
    • 1.Sf7!
      • threat
        • 2.d5#
      • 1...Qxc8
        • 2.Sd6#
      • 1...Sg4
        • 2.Qh1#
      • 1...g4
        • 2.Qf5#
      • 1...Qe5
        • 2.dxe5#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qa7
        • 2.Sd6#
      • 1...Qa8
        • 2.Sd6#
      • 1...Bg7
        • 2.Sxg5#
      • 1...Bf8
        • 2.Sxg5#
      • 1...Sa2
        • 2.Qe2#
      • 1...Se2
        • 2.Qxe2#
      • 1...Sb3
        • 2.Qe2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sf3
        • 2.Qg6#
      • 1...c5
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR2(F)
    • S(a);N_GUARD::QAR2(F),XS(a)
    • S(b);OGATE::QAB(F)
    • S(b);SBLOCK::QAB(F)
    • P(d);OGATE::QAB1(F)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • Q(h);P_SPINQ(h)::B(H)
      • Refutation
        • S(b);XQ(F)
  • Actual
    • S(I);
    • Threat
      • R(D)+P(E)
    • Vars
      • Q(h);N_GUARD,XB(H)::S(I)
      • S(b);OGATE::QAB(F)
      • P(d);OGATE::QAB1(F)
      • Q(h);OGATE::R(D)+P(E),XQ(h)
      • Q(h);N_GUARD::S(I),XQ(h)
      • Q(h);N_GUARD::S(I)
      • B(f);N_GUARD::S(I),XP(d)
      • S(a);N_GUARD::QAR2(F)
      • S(a);N_GUARD::QAR2(F),XS(a)
      • S(b);SBLOCK::QAB(F)
      • P(e);OGATE::R(D)+P(E),XP(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).