MESON Chess Problem Database

Problem Display
PID: 21825 (Bn1b4/3kPKQn/3N1P2/6p1/2N5/8/8/8 w - - 0 1)

Sheppard, Charles William

3rd Prize, Good Companions (March Meredith Ty.), 1921

Bn1b4/3kPKQn/3N1P2/6p1/2N5/8/8/8

#2

7 + 5

3132 The Good Companion Two-Mover 1922
5064 100 Years of the American Two-move Chess Problem 1962
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Bc7
      • 2.e8Q#
  • Tries
    • 1.Kg8?
      • threat
        • 2.e8Q#
      • 1...Ke6
        • 2.exd8S#
      • 1...Kc7
        • 2.e8S#
      • 1...Bxe7
        • 2.Qxe7#
      • 1...Ba5
        • 2.e8Q#
        • 2.e8R#
      • 1...Bb6
        • 2.e8Q#
        • 2.e8R#
      • 1...Bc7
        • 2.e8Q#
        • 2.e8R#
      • 1...Sxf6+!
  • Keys
    • 1.Kg6!
      • threat
        • 2.e8Q#
      • 1...Sf8+
        • 2.exf8S#
      • 1...Ke6
        • 2.exd8S#
      • 1...Kc7
        • 2.e8S#
      • 1...Bxe7
        • 2.Qxe7#
      • 1...Ba5
        • 2.e8Q#
        • 2.e8R#
      • 1...Bb6
        • 2.e8Q#
        • 2.e8R#
      • 1...Bc7
        • 2.e8Q#
        • 2.e8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(e);SBLOCK::P=Q
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • P=Q
      • Vars
        • K(b);S_FLIGHT::PXB(e)=S
        • K(b);P-FLIGHT::P=S
        • B(e);OGATE,P_SPINB(e),XP(D)::QAR1(F),XB(e)
        • B(e);::P=Q
        • B(e);SBLOCK::P=Q
      • Refutation
        • S(c);CHECK,XP(C)
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • P=Q
    • Vars
      • S(c);CHECK,OGATE::PXS(c)=S
      • K(b);S_FLIGHT::PXB(e)=S
      • K(b);P-FLIGHT::P=S
      • B(e);OGATE,P_SPINB(e),XP(D)::QAR1(F),XB(e)
      • B(e);::P=Q
      • B(e);SBLOCK::P=Q
HTML5 logo

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).