MESON Chess Problem Database

Problem Display
PID: 101151 (7N/r1Pp2np/1q2k2r/1N1pB2p/3p1PPQ/8/2B5/1b5K w - - 0 1)

Nield, Joshua

Good Companions, 1919

7N/r1Pp2np/1q2k2r/1N1pB2p/3p1PPQ/8/2B5/1b5K

#2

9 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Sxd4#
    • 1...Qxc7
      • 2.Sxd4#
    • 1...Qa6
      • 2.Sxd4#
    • 1...Qc6
      • 2.Sxd4#
    • 1...Qd6
      • 2.Sxd4#
    • 1...Qb7
      • 2.Sxd4#
    • 1...Qb8
      • 2.Sxd4#
    • 1...Rf6
      • 2.Qxf6#
    • 1...Sf5
      • 2.gxf5#
  • Tries
    • 1.c8Q?
      • threat
        • 2.Qg8#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Qd8
        • 2.Sxd4#
      • 1...Qb8
        • 2.Sxd4#
      • 1...Se8
        • 2.Qxe8#
      • 1...Ra8!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Qe7#
      • 1...Qxd6
        • 2.Sxd4#
      • 1...hxg4
        • 2.Qxh6#
      • 1...Rf6
        • 2.Qe1#
      • 1...Sf5
        • 2.gxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(e);N_GUARD::S(F),XP(b)
    • Q(e);N_GUARD,XP(H)::S(F),XP(b)
    • R(g);N_GUARD::QAR1(E),XR(g)
    • S(j);OGATE::P(D),XS(j)
  • Tries
    • Try
      • P(H);P_PINP(i)
      • Threat
        • QAB(H)
      • Vars
        • R(g);N_GUARD::QAR1(E),XR(g)
        • Q(e);N_GUARD::S(F),XP(b)
        • S(j);N_GUARD::QAR2(H),XS(j)
      • Refutation
        • R(h);
  • Actual
    • B(G);
    • Threat
      • QAR1(E)
    • Vars
      • Q(e);N_GUARD,SBLOCK,XB(G)::S(F),XP(b)
      • P(d);OGATE,P_PINQ(E),XP(D)::QAR(E),XR(g)
      • R(g);SBLOCK::QAR(E)
      • S(j);OGATE::P(D),XS(j)
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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).