MESON Chess Problem Database

Problem Display
PID: 70226 (1qnR4/1b3p2/B2p4/2Pp2N1/2Pkpp1R/3N3Q/3K3b/8 w - - 0 1)

White, Alain Campbell

Good Companions (July), 1920

1qnR4/1b3p2/B2p4/2Pp2N1/2Pkpp1R/3N3Q/3K3b/8

#2

9 + 10

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...exd3
      • 2.Qe3#
    • 1...e3+
      • 2.Qxe3#
    • 1...f3
      • 2.Sxf3#
    • 1...f5
      • 2.Se6#
    • 1...f6
      • 2.Se6#
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qf6#
      • 1...e3+
        • 2.Qxe3#
      • 1...Bxa6
        • 2.Qxd5#
      • 1...exd3
        • 2.Qe3#
      • 1...dxc4
        • 2.Qxc4#
        • 2.Qe5#
      • 1...dxc5
        • 2.Qxe4#
      • 1...fxe6
        • 2.Sxe6#
      • 1...f3
        • 2.Sxf3#
      • 1...f6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(c);P_SPINP(d),XS(B)::QAB1(C)
    • P(c);CHECK,P_SPINP(d)::QAB1(C),XP(c)
    • P(d);P_SPINP(c)::S(G),XP(d)
    • P(h);N_GUARD::S(G)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)
    • Vars
      • P(c);CHECK,OGATE,P_SPINP(d)::QAB1(C),XP(c)
      • B(g);N_GUARD,XB(H)::QAR1(C),XP(e)
      • P(c);OGATE,P_SPINP(d),XS(B)::QAB1(C)
      • P(f);P_SPINP(e),XP(F)::QAR1(C),XP(c)
      • P(h);XQ(C)::S(G),XP(h)
      • P(d);P_SPINP(c)::S(G),XP(d)
      • P(h);::QAB(C),XP(h)
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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).