MESON Chess Problem Database

Problem Display
PID: 195052 (Qb6/8/5P2/3R3q/4N1N1/4Bk2/5P2/K4B2 w - - 0 1)

Richmond, OH

Pittsburgh Sun, 1918

Qb6/8/5P2/3R3q/4N1N1/4Bk2/5P2/K4B2

#2

9 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Bg2#
      • 2.Re5#
      • 2.Rg5#
      • 2.Rxh5#
    • 1...Qxg4
      • 2.Sd2#
  • Tries
    • 1.Sg5+?
      • 1...Qxg5
        • 2.Rxg5#
      • 1...Kxg4!
    • 1.Rg5?
      • threat
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sd6#
      • 1...Be5+
        • 2.Sc3#
        • 2.Sxe5#
      • 1...Qxg4
        • 2.Sd2#
      • 1...Qg6
        • 2.Sd2#
      • 1...Qf7
        • 2.Sd2#
      • 1...Qe8
        • 2.Sd2#
      • 1...Qh7
        • 2.Sd2#
      • 1...Bg3
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sxg3#
        • 2.Sc5#
        • 2.Sd6#
      • 1...Bd6
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sxd6#
      • 1...Qxg5!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Rg5#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...Kxg4
        • 2.Rd4#
      • 1...Qxg4
        • 2.Rf5#
      • 1...Qxd5
        • 2.Sh2#
        • 2.Se5#
      • 1...Qg6
        • 2.Sh2#
        • 2.Se5#
      • 1...Qf7
        • 2.Sh2#
        • 2.Se5#
      • 1...Qe8
        • 2.Sh2#
      • 1...Qf5
        • 2.Sh2#
      • 1...Qg5
        • 2.Sh2#
        • 2.Rxg5#
      • 1...Qh7
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(b);SBLOCK,XS(F)::S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(b);OGATE,XS(E)::QAB(I)+R(G),XQ(b)
      • Refutation
        • K(a);S_FLIGHT,XS(F)
    • Try
      • R(G);
      • Threat
        • DUALS(5)
      • Vars
        • Q(b);XS(F)::QAB(I)+S(E),DCHECK
        • Q(b);::QAB(I)+S(E),DCHECK
      • Refutation
        • Q(b);XR(G)
  • Actual
    • S(E);
    • Threat
      • QAB(I)+R(G)
    • Vars
      • Q(b);CHECK,N_GUARD::S(F),XQ(b)
      • K(a);S_FLIGHT,XS(F)::R(G)
      • Q(b);SBLOCK,XS(F)::QAB(I)+R(G),DCHECK
      • Q(b);N_GUARD::S(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).