MESON Chess Problem Database

Problem Display
PID: 180050 (1qb5/1p4n1/5pQN/5p1p/5kp1/3P4/6K1/4R3 w - - 0 1)

Shire, David J

1st Prize, Problem Observer, 2012

1qb5/1p4n1/5pQN/5p1p/5kp1/3P4/6K1/4R3

#2

5 + 9

136 Problem Observer 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Qxf5#
    • 1...g3
      • 2.Qxg3#
  • Tries
    • 1.Sxg4?
      • threat
        • 2.Rf1#
      • 1...fxg4
        • 2.Re4#
      • 1...hxg4
        • 2.Qh6#
      • 1...Qa7!
    • 1.Sf7?
      • threat
        • 2.Qh6#
      • 1...g3
        • 2.Qxg3#
      • 1...Se6!
    • 1.Sg8?
      • threat
        • 2.Qh6#
      • 1...g3
        • 2.Qxg3#
      • 1...Se6!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Re4#
      • 1...Bxf5
        • 2.Qh6#
      • 1...Qe5
        • 2.Rf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(g);N_GUARD,S_CUTB(i)::QAR1(D),XP(c)
    • P(b);OGATE::QAB1(D),XP(b)
  • Tries
    • Try
      • S(E);XP(b)
      • Threat
        • R(A)
      • Vars
        • P(c);N_GUARD,XS(E)::R1(A)
        • P(d);SBLOCK,XS(E)::QAB(D)
      • Refutation
        • Q(h);
    • Try
      • S(E);
      • Threat
        • QAB(D)
      • Vars
        • P(b);OGATE::QAB1(D),XP(b)
      • Refutation
        • S(g);
    • Try
      • S(E);
      • Threat
        • QAB(D)
      • Vars
        • P(b);OGATE::QAB1(D),XP(b)
      • Refutation
        • S(g);
  • Actual
    • S(E);XP(c)
    • Threat
      • R1(A)
    • Vars
      • B(i);SBLOCK,XS(E)::QAB(D)
      • Q(h);SBLOCK::R(A)
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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).