MESON Chess Problem Database

Problem Display
PID: 21428 (n3B3/1K1RpNpQ/p3k3/1N1p2P1/8/r2rp3/5p2/bb3q2 w - - 0 1)

Blake, Percy Francis

2nd Prize, BCPJ (March), 1919

n3B3/1K1RpNpQ/p3k3/1N1p2P1/8/r2rp3/5p2/bb3q2

#2

7 + 13

756 Norsk Sjakkblad 1919

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Qxh3#
    • 1...Qc1
      • 2.Qh3#
    • 1...Qe1
      • 2.Qh3#
    • 1...Rac3
      • 2.Qg6#
    • 1...Rdc3
      • 2.Sd4#
    • 1...Be5
      • 2.Sd8#
    • 1...Sb6
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...d4
      • 2.Qe4#
      • 2.Qg6#
  • Tries
    • 1.Qe4+?
      • 1...Be5
        • 2.Sd8#
        • 2.Qg4#
        • 2.Qxe5#
      • 1...dxe4!
  • Keys
    • 1.Rc7!
      • threat
        • 2.Rc6#
      • 1...Sxc7
        • 2.Sxc7#
      • 1...d4
        • 2.Qe4#
      • 1...g6
        • 2.Bd7#
      • 1...Qc1
        • 2.Qh3#
      • 1...Rac3
        • 2.Qg6#
      • 1...Rdc3
        • 2.Sd4#
      • 1...Be5
        • 2.Sd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_GUARD::QAB(F),XQ(c)
    • Q(c);N_GUARD::QAB(F)
    • R(e);S_CUTB(a)::QAR2(F)
    • R(f);N_GUARD,S_CUTB(a)::S(A)
    • B(a);SBLOCK::S(E)
    • S(m);N_GUARD::S(A)
    • S(m);N_GUARD::S(A),XS(m)
  • Tries
    • Try
      • Q(F);CHECK
      • Refutation
        • P(h);XQ(F)
  • Actual
    • R(D);
    • Threat
      • R(D)
    • Vars
      • S(m);XR(D)::S(A),XS(m)
      • P(h);N_GUARD,S_CUTB(a)::QAR2(F)
      • P(l);::B(G)
      • Q(c);N_GUARD::QAB(F)
      • R(e);S_CUTB(a)::QAR2(F)
      • R(f);N_GUARD,S_CUTB(a)::S(A)
      • B(a);SBLOCK::S(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).