MESON Chess Problem Database

Problem Display
PID: 42430 (8/Q1N1R2b/pnp5/5p1p/nPPk1b1r/6N1/1PP4P/2B2BK1 w - - 0 1)

Clark, Cecil Henry Douglas

4th Comm., BCF 033. Ty., 1939-1940

8/Q1N1R2b/pnp5/5p1p/nPPk1b1r/6N1/1PP4P/2B2BK1

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Be3+
      • 2.Bxe3#
    • 1...Bxg3
      • 2.Be3#
    • 1...Be5
      • 2.Se6#
    • 1...Bd6
      • 2.Be3#
    • 1...Bxc7
      • 2.Be3#
    • 1...Bg8
      • 2.Sxf5#
    • 1...Sxb2
      • 2.Bxb2#
    • 1...Sc5
      • 2.c3#
  • Tries
    • 1.Qxb6+?
      • 1...Sc5
        • 2.Qxc5#
        • 2.c3#
      • 1...Sxb6
        • 2.c3#
      • 1...c5!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Se6#
      • 1...Be3+
        • 2.Bxe3#
      • 1...Bxc1
        • 2.Qh8#
      • 1...Bxg3
        • 2.Be3#
      • 1...Bxc7
        • 2.Be3#
      • 1...Sxb2
        • 2.Bxb2#
      • 1...Sxc4
        • 2.Se2#
      • 1...Bd2
        • 2.Qh8#
      • 1...Bd6
        • 2.Be3#
      • 1...Bg8
        • 2.Sxf5#
      • 1...Sc5
        • 2.c3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(c);CHECK,N_GUARD::B(A),XB(c)
    • B(c);N_GUARD,XS(G)::B(A)
    • B(c);SBLOCK::S(K)
    • B(c);N_GUARD::B(A)
    • B(c);N_GUARD,XS(K)::B(A)
    • B(j);N_GUARD::S(G),XP(e)
    • S(a);OGATE,XP(D)::B(A),XS(a)
    • S(a);N_GUARD,N_SPINS(h)::P(E)
  • Tries
    • Try
      • Q(J);CHECK,XS(h)
      • Vars
        • S(a);XQ(J)::P(E)
      • Refutation
        • P(i);P_SPINP(i)
  • Actual
    • Q(J);N_PINS(h)
    • Threat
      • S(K)
    • Vars
      • B(c);CHECK,N_GUARD::B(A),XB(c)
      • B(c);N_GUARD,XB(A)::QAB(J)
      • B(c);N_GUARD,XS(G)::B(A)
      • B(c);N_GUARD,XS(K)::B(A)
      • S(a);OGATE,XP(D)::B(A),XS(a)
      • S(h);SBLOCK,XP(I)::S(G)
      • B(c);N_GUARD::QAB(J)
      • B(c);N_GUARD::B(A)
      • B(j);N_GUARD::S(G),XP(e)
      • S(a);N_GUARD::P(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).