MESON Chess Problem Database

Problem Display
PID: 10562 (8/n5b1/1R4br/Ppk1p2r/6p1/P2Q2nq/1BP1p3/1KR1N3 w - - 0 1)

Whyatt, William Albert

The Problemist, 1965

8/n5b1/1R4br/Ppk1p2r/6p1/P2Q2nq/1BP1p3/1KR1N3

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Rxb5#
    • 1...Sc8
      • 2.Qxb5#
    • 1...b4
      • 2.axb4#
  • Tries
    • 1.Bc3?
      • threat
        • 2.Bb4#
      • 1...Sc6
        • 2.Rxb5#
      • 1...b4
        • 2.Bxb4#
        • 2.axb4#
      • 1...Bxd3!
  • Keys
    • 1.c4!
      • threat
        • 2.cxb5#
      • 1...Bxd3+
        • 2.Sxd3#
      • 1...bxc4
        • 2.Rxc4#
      • 1...Bf7
        • 2.Qe3#
      • 1...Se4
        • 2.Qd5#
      • 1...b4
        • 2.axb4#
      • 1...e4
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • S(k);N_GUARD,SBLOCK::R1(I),XP(e)
    • S(k);N_GUARD::QAR1(G),XP(e)
    • P(e);OGATE::P(F),XP(e)
  • Tries
    • Try
      • B(D);
      • Threat
        • B(D)
      • Vars
        • S(k);N_GUARD,SBLOCK::R1(I),XP(e)
      • Refutation
        • B(i);P_PINP(E),XQ(G)
  • Actual
    • P(E);P_SPINQ(G)
    • Threat
      • R(B)+P(E),XP(e)
    • Vars
      • B(i);CHECK,XQ(G)::S(C),XB(i)
      • P(e);OGATE,P_SPINP(e),XP(E)::R1(B),XP(e)
      • B(i);N_PINQ(G)::QAB(G)
      • S(b);N_PINQ(G)::QAR1(G)
      • P(e);OGATE::P(F),XP(e)
      • P(g);N_PINQ(G)::QAB1(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).