MESON Chess Problem Database

Problem Display
PID: 180311 (6Q1/B6p/7p/4p1nP/4P3/5PkB/4PNN1/7K w - - 0 1)

Lider, Valentin Viktorovich

1st HM., Europe Echecs, 1990

6Q1/B6p/7p/4p1nP/4P3/5PkB/4PNN1/7K

#2

10 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Bg4?
      • 1...Sxf3
        • 2.Bxf3#
      • 1...Sxe4
        • 2.Sxe4#
      • 1...Sh3
        • 2.Bxh3#
      • 1...Se6
        • 2.Bxe6#
      • 1...Sf7!
    • 1.Qe6?
      • threat
        • 2.Qg4#
        • 2.Qxe5#
      • 1...Sxf3
        • 2.Qg4#
      • 1...Sxh3
        • 2.Qxh3#
        • 2.Qg4#
      • 1...Sf7
        • 2.Qg4#
      • 1...Sxe6!
    • 1.Qd8?
      • 1...Sxh3
        • 2.Qh4#
      • 1...Sxe4
        • 2.Qh4#
      • 1...Se6
        • 2.Qh4#
      • 1...Sf7
        • 2.Qh4#
      • 1...Sxf3!
  • Keys
    • 1.Qb3!
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Sxh3
        • 2.f4#
      • 1...Sxe4
        • 2.fxe4#
      • 1...Se6
        • 2.f4#
      • 1...Sf7
        • 2.f4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(F);N_PINS(c)
      • Vars
        • S(c);OGATE,XP(E)::QAR(J)+B(F),XS(c)
        • S(c);XP(G)::S(C),XS(c)
        • S(c);OGATEB::QAR(J)+B(F),XS(c)
      • Refutation
        • S(c);
    • Try
      • Q(J);N_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);XP(E)::QAR1(J)
        • S(c);::QAR1(J)
      • Refutation
        • S(c);XQ(J)
    • Try
      • Q(J);N_PINS(c)
      • Vars
        • S(c);OGATE,XB(F)::QAB1(J)
        • S(c);OGATE,XP(G)::QAB1(J)
        • S(c);OGATE::QAB1(J)
      • Refutation
        • S(c);XP(E)
  • Actual
    • Q(J);N_PINS(c)
    • Vars
      • S(c);OGATE,P_SPINS(c),XP(E)::QAR1(J),XS(c)
      • S(c);N_GUARD,XB(F)::QAR(J)+P(E)
      • S(c);OGATE,XP(G)::QAR(J)+P(E),XS(c)
      • S(c);N_GUARD::QAR(J)+P(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).