MESON Chess Problem Database

Problem Display
PID: 106873 (1Kn2k2/2pR1Pp1/7b/Q7/8/4pr2/8/8 w - - 0 1)

Perry, William E

New York Clipper, 1887

1Kn2k2/2pR1Pp1/7b/Q7/8/4pr2/8/8

#2

4 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qc5#
    • 1...Sa7
      • 2.Qc5#
    • 1...c5
      • 2.Qd8#
    • 1...c6
      • 2.Qd8#
  • Tries
    • 1.Qc5+?
      • 1...Se7
        • 2.Qxe7#
      • 1...Sd6!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qe8#
      • 1...Rxf7
        • 2.Rd8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sd6
        • 2.Qe7#
      • 1...g5
        • 2.Qh8#
      • 1...g6
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • S(f);N_GUARD::QAB(A)
    • P(d);OGATE::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(A),XS(f)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(b);SBLOCK,XP(C)::R(B)
      • S(f);N_GUARD::QAB1(A),XS(f)
      • S(f);N_GUARD::QAB1(A)
      • P(e);OGATE::QAR2(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).