MESON Chess Problem Database

Problem Display
PID: 226397 (K7/1NpkPP2/Rp1b1n1R/3n1p2/7B/1B6/2Q5/8 w - - 0 1)

Barclay, William L

US Problem Bulletin, 1981

K7/1NpkPP2/Rp1b1n1R/3n1p2/7B/1B6/2Q5/8

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.e8Q#
    • 1...Sg4
      • 2.e8Q#
    • 1...Sh5
      • 2.e8Q#
    • 1...Sh7
      • 2.e8Q#
    • 1...Sg8
      • 2.e8Q#
  • Tries
    • 1.Qxf5+?
      • 1...Kc6
        • 2.Ba4#
      • 1...Kxe7!
  • Keys
    • 1.Qc6+!
      • 1...Kxc6
        • 2.Ba4#
      • 1...Ke6
        • 2.e8Q#
      • 1...Kxe7
        • 2.Qe8#
      • 1...Kc8
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(e);N_GUARD::P=Q
  • Tries
    • Try
      • Q(A);CHECK,XP(b)
      • Vars
        • K(g);P_SPINP(c),S_FLIGHT::B(B)
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(e),XP(G)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(g);P_SPINP(c),S_FLIGHT,XQ(A)::B(B)
      • K(g);P_SPINB(d),P_SPINS(a),S_FLIGHT::P=Q
      • K(g);OGATE,P-FLIGHT,P_SPINS(e),XP(G)::QAR1(A)
      • K(g);P_SPINP(f),S_FLIGHT::S(F),XB(d)
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).