MESON Chess Problem Database

Problem Display
PID: 224461 (2Q5/3n4/4R3/3p4/3P1kNK/1p3N2/1Pn2P2/1B6 w - - 0 1)

Perry, William E

Philadelphia Times, 1887

2Q5/3n4/4R3/3p4/3P1kNK/1p3N2/1Pn2P2/1B6

#2

9 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qf8#
    • 1...Sb6
      • 2.Qf8#
    • 1...Sb8
      • 2.Qf8#
    • 1...Sf8
      • 2.Qxf8#
  • Tries
    • 1.Qf8+?
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sxf8!
  • Keys
    • 1.Sg5!
      • 1...Kf5
        • 2.Rf6#
      • 1...Sxd4
        • 2.Qc1#
      • 1...Sa1
        • 2.Qc1#
      • 1...Se1
        • 2.Qc1#
      • 1...Sa3
        • 2.Qc1#
      • 1...Se3
        • 2.fxe3#
      • 1...Sb4
        • 2.Qc1#
      • 1...Sc5
        • 2.Rf6#
        • 2.Qf8#
      • 1...Se5
        • 2.Rf6#
      • 1...Sb6
        • 2.Rf6#
        • 2.Qf8#
      • 1...Sf6
        • 2.Rxf6#
      • 1...Sb8
        • 2.Rf6#
        • 2.Qf8#
      • 1...Sf8
        • 2.Rf6#
        • 2.Qxf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 4
  • Sets
    • S(e);N_GUARD::QAR(I)
    • S(e);N_GUARD::QAR(I),XS(e)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR2(I),XS(e)
      • Refutation
        • S(e);XQ(I)
  • Actual
    • S(D);
    • Vars
      • K(c);P-FLIGHT,P_SPINS(a)::R1(H)
      • S(a);OGATE,XP(E)::QAB(I)
      • S(a);OGATE::QAB(I)
      • S(a);OGATE::P(C),XS(a)
      • S(e);N_GUARD::R(H)
      • S(e);N_GUARD::R(H),XS(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).