MESON Chess Problem Database

Problem Display
PID: 51261 (B5n1/5p2/Rp3P2/1p2k3/1B2N1Qp/8/8/1n5K w - - 0 1)

Lawton, Howard

Manchester Guardian, 1955

B5n1/5p2/Rp3P2/1p2k3/1B2N1Qp/8/8/1n5K

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Bc3#
    • 1...Sa3
      • 2.Bc3#
    • 1...Sc3
      • 2.Bxc3#
  • Tries
    • 1.Qf4+?
      • 1...Kd4
        • 2.Sf2#
        • 2.Sc5#
      • 1...Ke6
        • 2.Sc5#
      • 1...Kxf4!
    • 1.Qg5+?
      • 1...Ke6
        • 2.Qd5#
      • 1...Kd4!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sd7#
      • 1...Kd6
        • 2.Qf4#
      • 1...Kxf6
        • 2.Sd7#
      • 1...Sxf6
        • 2.Sd3#
      • 1...bxc5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::B(B)
    • S(a);N_GUARD::B(B),XS(a)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINP(e)::S(C)
      • Refutation
        • K(d);S_FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT,P_SPINP(e)::QAB1(D)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(d);P_SPINP(e),S_FLIGHT::QAB(D)
      • K(d);P_SPINP(e),S_FLIGHT,XP(F)::S(C)
      • S(g);SBLOCK,XP(F)::S(C)
      • P(e);XS(C)::QAR1(D)
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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).