MESON Chess Problem Database

Problem Display
PID: 164969 (r2k4/3p1p1K/3P1p2/R6p/4p3/6p1/8/Q1q5 w - - 0 1)

Borisenka, I

Sachmatija, 2008

r2k4/3p1p1K/3P1p2/R6p/4p3/6p1/8/Q1q5

#2

4 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Rxa8#
    • 1...Qe3
      • 2.Rxa8#
    • 1...Qf4
      • 2.Rxa8#
    • 1...Qg5
      • 2.Rxa8#
    • 1...Qd1
      • 2.Rxa8#
    • 1...Qe1
      • 2.Rxa8#
    • 1...Qf1
      • 2.Rxa8#
    • 1...Qg1
      • 2.Rxa8#
    • 1...Qh1
      • 2.Rxa8#
    • 1...f5
      • 2.Qh8#
  • Tries
    • 1.Qxf6+?
      • 1...Ke8
        • 2.Qe7#
        • 2.Qh8#
      • 1...Kc8!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Rg8#
      • 1...Kc8
        • 2.Qxa8#
      • 1...Ke8
        • 2.Rg8#
      • 1...Qxg5
        • 2.Qxa8#
      • 1...fxg5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::R(B),XR(h)
    • P(e);OGATE::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK,XP(e)
      • Refutation
        • K(i);P-FLIGHT
  • Actual
    • R(B);
    • Threat
      • R(B)
    • Vars
      • K(i);P-FLIGHT::QAR2(A),XR(h)
      • K(i);P-FLIGHT::R(B)
      • Q(a);N_GUARD,XR(B)::QAR(A),XR(h)
      • P(e);OGATE,XR(B)::QAR(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).