MESON Chess Problem Database

Problem Display
PID: 154152 (4N1Q1/7n/3BR3/1B3k1q/K2p2p1/8/3nP3/4bN1b w - - 0 1)

O'Keefe, John James

Extra Prize, Sydney Morning Herald, 1901

4N1Q1/7n/3BR3/1B3k1q/K2p2p1/8/3nP3/4bN1b

#2

8 + 8

119 Tidskrift for Schack 1909
3713 Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Qxg6#
    • 1...Qh2
      • 2.Qg6#
    • 1...Qh3
      • 2.Qg6#
    • 1...Qh4
      • 2.Qg6#
    • 1...Bg3
      • 2.Sxg3#
    • 1...Sf3
      • 2.Bd3#
    • 1...Sg5
      • 2.Sg7#
    • 1...d3
      • 2.Se3#
  • Tries
    • 1.Rf6+?
      • 1...Ke4
        • 2.Bd3#
        • 2.Rf4#
      • 1...Sxf6!
  • Keys
    • 1.Re4!
      • threat
        • 2.Rf4#
      • 1...Kxe4
        • 2.Bd3#
      • 1...Bxe4
        • 2.Bd7#
      • 1...Sxe4
        • 2.Bd7#
      • 1...Qg6
        • 2.Qd5#
      • 1...Qf7
        • 2.Qxg4#
      • 1...Qh2
        • 2.Qxg4#
      • 1...Qg5
        • 2.Qe6#
      • 1...Qh6
        • 2.Qxg4#
      • 1...Bg3
        • 2.Sxg3#

This anticipates 273567(1944)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::QAB1(H),XQ(g)
    • Q(g);N_GUARD::QAB1(H)
    • B(a);N_GUARD::S(A),XB(a)
    • S(c);N_GUARD,S_CUTB(b)::B(D)
    • S(h);SBLOCK::S(G)
    • P(d);N_GUARD::S(A)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • S(h);XR(F)
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • K(f);OGATEB,S_FLIGHT,XR(F)::B(D)
      • B(b);SBLOCK,XR(F)::B(D)
      • S(c);SBLOCK,XR(F)::B(D)
      • Q(g);SBLOCK::QAR2(H)
      • Q(g);N_GUARD::QAB1(H),XP(e)
      • Q(g);SBLOCK::QAB1(H)
      • B(a);N_GUARD::S(A),XB(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).