MESON Chess Problem Database

Problem Display
PID: 187686 (1Q4B1/p7/P7/1n2R2K/2Nk1p1p/P4n2/1bP2NRr/2r3B1 w - - 0 1)

Lyon, II

HM., Jamaican Daily Telegraph, 1909

1Q4B1/p7/P7/1n2R2K/2Nk1p1p/P4n2/1bP2NRr/2r3B1

#2

11 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Se4#
    • 1...Se1
      • 2.Sd1#
      • 2.Se4#
    • 1...Sd2
      • 2.Sd1#
    • 1...Sxe5
      • 2.Qxe5#
    • 1...Sg5
      • 2.Sd1#
    • 1...Sxa3
      • 2.Qxb2#
    • 1...Sc3
      • 2.Qxa7#
    • 1...Sd6
      • 2.Qxb2#
    • 1...Sc7
      • 2.Qxb2#
  • Tries
    • 1.Qd6+?
      • 1...Kc3
        • 2.Se4#
        • 2.Qd3#
      • 1...Sxd6!
    • 1.Qxa7+?
      • 1...Kc3
        • 2.Se4#
      • 1...Sxa7!
    • 1.Qb6+?
      • 1...Kc3
        • 2.Se4#
      • 1...axb6!
    • 1.Qd8+?
      • 1...Kc3
        • 2.Se4#
        • 2.Qd3#
      • 1...Sd6!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Sxb5#
      • 1...Kc3
        • 2.Sfe4#
      • 1...Kxe5
        • 2.Sg4#
      • 1...Sxe5
        • 2.Sd1#
      • 1...Sxa3
        • 2.Qxb2#
      • 1...Sxd6
        • 2.Qxb2#
      • 1...Sc3
        • 2.Sf5#
      • 1...Sc7
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(e);S_FLIGHT::S(C)
    • S(d);N_GUARD::B(A)+S(C)
    • S(d);OGATE,XR(G)::QAB1(J),XS(d)
    • S(h);OGATE,XP(E)::QAB(J),XB(b)
    • S(h);N_GUARD,SBLOCK::QAB(J),XP(i)
    • S(h);OGATE::QAB(J),XB(b)
  • Tries
    • Try
      • Q(J);CHECK
      • Refutation
        • S(h);XQ(J)
    • Try
      • Q(J);CHECK,XP(i)
      • Vars
        • K(e);S_FLIGHT::S(C)
      • Refutation
        • S(h);XQ(J)
    • Try
      • Q(J);CHECK
      • Vars
        • K(e);S_FLIGHT::S(C)
      • Refutation
        • P(i);XQ(J)
    • Try
      • Q(J);CHECK
      • Refutation
        • S(h);P_SPINS(h)
  • Actual
    • S(F);
    • Threat
      • S(F),XS(h)
    • Vars
      • K(e);S_FLIGHT::S(C)
      • K(e);S_FLIGHT,XR(G)::S(C)
      • S(d);N_GUARD,SBLOCK,XR(G)::B(A)+S(C)
      • S(h);OGATE,XP(E)::QAB(J),XB(b)
      • S(h);OGATE,XS(F)::QAB(J),XB(b)
      • S(h);SBLOCK::S(F)
      • S(h);OGATE::QAB(J),XB(b)
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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).