MESON Chess Problem Database

Problem Display
PID: 144262 (8/bb1N1p2/4nrn1/4B3/1p1pk1B1/1Q4Pp/KPPR3q/5N1r w - - 0 1)

O'Keefe, John James

Melbourne Leader, 1909

8/bb1N1p2/4nrn1/4B3/1p1pk1B1/1Q4Pp/KPPR3q/5N1r

#2

10 + 12

119 Tidskrift for Schack 1909

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3
      • 2.Sxg3#
    • 1...Qxd2
      • 2.Sxd2#
    • 1...Qe2
      • 2.Rxe2#
    • 1...Rf3
      • 2.Qxf3#
    • 1...Sef4
      • 2.Qf3#
    • 1...Sc5
      • 2.Rxd4#
    • 1...Sgf4
      • 2.Qf3#
    • 1...Sxe5
      • 2.Sxf6#
    • 1...d3
      • 2.Qxd3#
      • 2.cxd3#
  • Keys
    • 1.c4!
      • threat
        • 2.Qd3#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...Qxd2
        • 2.Sxd2#
      • 1...Sxe5
        • 2.Sxf6#
      • 1...bxc4 ep
        • 2.Qxb7#
      • 1...dxc4 ep
        • 2.Qc2#
      • 1...Qe2
        • 2.Rxe2#
      • 1...Rf3
        • 2.Qxf3#
      • 1...Sef4
        • 2.Qf3#
      • 1...Sc5
        • 2.Rxd4#
      • 1...Sgf4
        • 2.Qf3#
      • 1...d3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(b);XP(G)::S(A),XQ(b)
    • Q(b);XR(E)::S(A),XQ(b)
    • Q(b);N_GUARD::R(E),XQ(b)
    • R(h);N_GUARD::QAB1(F),XR(h)
    • S(g);S_CUTR(h)::QAB1(F)
    • S(g);N_GUARD,S_CUTB(j)::R1(E),XP(e)
    • S(i);S_CUTR(h)::QAB1(F)
    • S(i);SBLOCK,XB(I)::S(J),XR(h)
  • Actual
    • P(D);
    • Threat
      • QAB1(F)
    • Vars
      • Q(b);XP(G)::S(A),XQ(b)
      • Q(b);P_PINP(C),XR(E)::S(A),XQ(b)
      • S(i);SBLOCK,XB(I)::S(J),XR(h)
      • P(d);EP,OGATE,XP(D)::QAB(F),XB(k)
      • P(e);EP,N_GUARD,XP(D)::QAB(F)
      • Q(b);N_GUARD::R(E),XQ(b)
      • R(h);N_GUARD::QAB1(F),XR(h)
      • S(g);S_CUTR(h)::QAB1(F)
      • S(g);N_GUARD,S_CUTB(j)::R1(E),XP(e)
      • S(i);S_CUTR(h)::QAB1(F)
      • P(e);::QAB1(F),XP(e)
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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).