MESON Chess Problem Database

Problem Display
PID: 143521 (5K2/7b/5Q1p/4N1pp/4p2k/4p2P/4Br1P/4B1Nn w - - 0 1)

Keeney, Palmer Gunkel

American Chess Problemist, 1949

5K2/7b/5Q1p/4N1pp/4p2k/4p2P/4Br1P/4B1Nn

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bg6
      • 2.Sxg6#
    • 1...Bg8
      • 2.Sg6#
  • Tries
    • 1.Qf4+?
      • 1...g4
        • 2.Qf6#
      • 1...gxf4!
    • 1.Qf7?
      • 1...g4
        • 2.Qf6#
      • 1...Bf5
        • 2.Qxh5#
      • 1...Bg6
        • 2.Sxg6#
      • 1...Bg8
        • 2.Sg6#
      • 1...Sg3!
  • Keys
    • 1.Qf3!
      • 1...exf3
        • 2.Sexf3#
      • 1...g4
        • 2.Qf6#
      • 1...Bf5
        • 2.Qxh5#
      • 1...Bg6
        • 2.Sxg6#
      • 1...Bg8
        • 2.Sg6#
      • 1...Sg3
        • 2.hxg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(i);N_GUARD::S(F),XB(i)
    • B(i);N_GUARD::S(F)
  • Tries
    • Try
      • Q(G);CHECK,N_PINP(f)
      • Vars
        • P(f);P_SPINP(f)::QAB(G)
      • Refutation
        • P(f);XQ(G)
    • Try
      • Q(G);N_PINP(f)
      • Vars
        • P(f);::QAB(G)
        • B(i);N_PINQ(G)::QAR1(G),XP(g)
        • B(i);N_GUARD::S(F),XB(i)
        • B(i);N_GUARD::S(F)
      • Refutation
        • S(a);N_SPINR(b)
  • Actual
    • Q(G);N_PINP(f)
    • Vars
      • P(d);XQ(G)::S(F),XP(d)
      • P(f);::QAB(G)
      • B(i);N_PINQ(G)::QAR1(G),XP(g)
      • B(i);N_GUARD::S(F),XB(i)
      • B(i);N_GUARD::S(F)
      • S(a);N_SPINR(b),OGATE::P(D),XS(a)
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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).