MESON Chess Problem Database

Problem Display
PID: 144260 (1b2q3/3NNp1p/pP1k4/n5B1/Qp1pR2K/4prp1/2P5/8 w - - 0 1)

O'Keefe, John James

1st Prize, Melbourne Leader, 1909

1b2q3/3NNp1p/pP1k4/n5B1/Qp1pR2K/4prp1/2P5/8

#2

8 + 12

119 Tidskrift for Schack 1909

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd7
      • 2.Qxb4#
    • 1...Rf4+
      • 2.Bxf4#
    • 1...Sb3
      • 2.Qc6#
    • 1...Sc4
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sb7
      • 2.Qc6#
    • 1...b3
      • 2.Qxd4#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qd5#
      • 1...Rf4+
        • 2.Bxf4#
      • 1...Qxe7
        • 2.Bxe7#
      • 1...Rf5
        • 2.Sxf5#
      • 1...axb5!
  • Keys
    • 1.c4!
      • threat
        • 2.c5#
      • 1...Rf4+
        • 2.Bxf4#
      • 1...Qxd7
        • 2.Qxb4#
      • 1...Qxe7
        • 2.Bxe7#
      • 1...Sxc4
        • 2.Qc6#
      • 1...bxc4 ep
        • 2.Qxd4#
      • 1...dxc4 ep
        • 2.Qd1#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Qc8
        • 2.Sxc8#
      • 1...Rf5
        • 2.Sxf5#
      • 1...Sb3
        • 2.Qc6#
      • 1...Sb7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(l);SBLOCK,XS(G)::QAB(B),XP(d)
    • R(b);CHECK,N_GUARD::B(E),XR(b)
    • S(f);N_GUARD::QAR1(B)
    • S(f);N_GUARD::QAR1(B),XS(f)
    • P(d);OGATE::QAR2(B),XP(e)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • R(b);CHECK,N_GUARD::B(E),XR(b)
        • Q(l);OGATE,P_PINB(E),XS(H)::B(E),XQ(l)
        • R(b);N_GUARD::S(H),XR(b)
      • Refutation
        • P(g);XQ(B)
  • Actual
    • P(A);
    • Threat
      • P(A)
    • Vars
      • R(b);CHECK,N_GUARD::B(E),XR(b)
      • Q(l);SBLOCK,XS(G)::QAB(B),XP(d)
      • Q(l);OGATE,P_PINB(E),XS(H)::B(E),XQ(l)
      • S(f);N_GUARD,XP(A)::QAR1(B)
      • P(d);EP,OGATE,XP(A)::QAR2(B),XP(e)
      • P(e);EP,OGATEB,XP(A)::QAR(B)
      • S(f);N_GUARD::QAR1(B),XS(f)
      • Q(l);N_GUARD::S(H),XQ(l)
      • R(b);N_GUARD::S(H),XR(b)
      • S(f);N_GUARD::QAR1(B)
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).