MESON Chess Problem Database

Problem Display
PID: 185760 (3r4/p7/2b1pR2/KpQ1pP2/1n2k1r1/1N4bN/4B1P1/1nB5 w - - 0 1)

Evans, TC

The Observer, 1931

(First published on Tue Aug 9 1932)

3r4/p7/2b1pR2/KpQ1pP2/1n2k1r1/1N4bN/4B1P1/1nB5

#2

9 + 11

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Sg5#
    • 1...Rh4
      • 2.Sg5#
    • 1...Rg5
      • 2.Sxg5#
    • 1...Rd5
      • 2.Qe3#
    • 1...Bf2
      • 2.Sxf2#
    • 1...Bh2
      • 2.Sf2#
    • 1...Bf4
      • 2.Sf2#
    • 1...Bd5
      • 2.Qe3#
    • 1...Sd3
      • 2.Bf3#
    • 1...Sd5
      • 2.Qc2#
  • Tries
    • 1.Qc4+?
      • 1...Rd4
        • 2.Sc5#
        • 2.Bf3#
      • 1...bxc4!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Qxe5#
      • 1...Rxf4
        • 2.Sg5#
      • 1...Bxf4
        • 2.Sf2#
      • 1...exf4
        • 2.Rxe6#
      • 1...Rd5
        • 2.Qe3#
      • 1...Bd5
        • 2.Qe3#
      • 1...Sd3
        • 2.Bf3#
      • 1...Sd5
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(e);N_GUARD::S(E)
    • R(e);N_GUARD::S(E),XR(e)
    • R(k);SBLOCK::QAR1(G)
    • B(b);N_GUARD::S(E),XB(b)
    • B(b);N_GUARD::S(E)
    • B(h);SBLOCK::QAR1(G)
    • S(c);SBLOCK::B(B)
    • S(c);N_GUARD,SBLOCK,S_CUTR(k)::QAB(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Refutation
        • P(f);XQ(G)
  • Actual
    • B(A);
    • Threat
      • QAR1(G),XP(g)
    • Vars
      • R(e);N_GUARD,SBLOCK,XB(A)::S(E)
      • B(b);N_GUARD,SBLOCK,XB(A)::S(E)
      • P(g);OGATEB,XB(A)::R(I),XP(i)
      • R(k);SBLOCK::QAR1(G)
      • B(h);SBLOCK::QAR1(G)
      • S(c);SBLOCK::B(B)
      • S(c);N_GUARD,SBLOCK,S_CUTR(k)::QAB(G)
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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).