MESON Chess Problem Database

Problem Display
PID: 121017 (5n2/3PbNpP/2BPk1p1/4P3/6K1/8/4pQ2/8 w - - 0 1)

Bergson, Gudmund

Checkmate, 1904

5n2/3PbNpP/2BPk1p1/4P3/6K1/8/4pQ2/8

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...e1Q
      • 2.Qa2#
    • 1...e1S
      • 2.Qa2#
    • 1...e1B
      • 2.Qa2#
    • 1...e1R
      • 2.Qa2#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Sg5+?
      • 1...Kxe5
        • 2.Qf4#
      • 1...Bxg5!
    • 1.Sd8+?
      • 1...Kxe5
        • 2.Qf4#
      • 1...Bxd8!
    • 1.dxe7?
      • threat
        • 2.e8Q#
        • 2.e8R#
      • 1...Sxd7
        • 2.e8Q#
        • 2.e8R#
      • 1...Sxh7
        • 2.e8Q#
        • 2.e8R#
      • 1...e1Q
        • 2.e8Q#
        • 2.e8R#
      • 1...e1S
        • 2.e8Q#
        • 2.e8R#
      • 1...e1B
        • 2.e8Q#
        • 2.e8R#
      • 1...e1R
        • 2.e8Q#
        • 2.e8R#
      • 1...g5
        • 2.e8Q#
        • 2.e8R#
      • 1...Kxe7!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qa2#
      • 1...Kxf7
        • 2.d8S#
      • 1...Bxd6
        • 2.d8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • P(a);OGATE::QAB(A)
    • P(c);N_GUARD::QAB1(A)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(C)::QAB1(A)
      • Refutation
        • B(d);XS(G)
    • Try
      • S(G);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(C)::QAB1(A)
      • Refutation
        • B(d);XS(G)
    • Try
      • P(E);XB(d)
      • Threat
        • P=Q
      • Vars
        • S(f);XP(F)::P=Q
        • S(f);XP(H)::P=Q
        • P(a);::P=Q
        • P(c);::P=Q
      • Refutation
        • K(b);P-FLIGHT,XP(E)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • K(b);S_FLIGHT,XS(G)::P=S
      • B(d);N_GUARD,XP(E)::P=S
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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).