MESON Chess Problem Database

Problem Display
PID: 27937 (8/8/3p3r/Bp1Q4/kPp1p3/p7/P1N1K2p/8 w - - 0 1)

Shanahan, Ian

The Problemist, 2001

8/8/3p3r/Bp1Q4/kPp1p3/p7/P1N1K2p/8

#2

6 + 8

56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qb3#
  • Tries
    • 1.Se1?
      • threat
        • 2.Qd1#
      • 1...c3
        • 2.Qb3#
      • 1...Rh3!
    • 1.Qd1?
      • threat
        • 2.Sa1#
        • 2.Se1#
        • 2.Se3#
        • 2.Sd4#
      • 1...h1Q
        • 2.Se1#
      • 1...h1R
        • 2.Se1#
      • 1...Rh3
        • 2.Se3#
      • 1...e3
        • 2.Sa1#
        • 2.Se1#
        • 2.Sxe3#
        • 2.Sd4#
      • 1...c3!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Bb6#
        • 2.Bc7#
        • 2.Bd8#
      • 1...Rh7
        • 2.Bc7#
      • 1...Rh8
        • 2.Bd8#
      • 1...d5
        • 2.Bb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(d);OGATE::QAB1(F)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB(F)
      • Vars
        • P(d);OGATE::QAB1(F)
      • Refutation
        • R(h);
    • Try
      • Q(F);
      • Threat
        • DUALS(4)
      • Vars
        • P(a);::QAB(F)+S(B)
        • R(h);SBLOCK::QAB(F)+S(B)
      • Refutation
        • P(d);
  • Actual
    • Q(F);
    • Threat
      • DUALS(3)
    • Vars
      • R(h);::QAR(F)+B(E)
      • P(g);::QAR(F)+B(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).