MESON Chess Problem Database

Problem Display
PID: 185833 (3R1R2/2p1p3/B2p4/1n1P3N/4k3/1Q2n1B1/4N3/1b5K w - - 0 1)

Driver, John Edward

Chess, 1957

3R1R2/2p1p3/B2p4/1n1P3N/4k3/1Q2n1B1/4N3/1b5K

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qf3#
    • 1...Sf1
      • 2.Qf3#
    • 1...Sc2
      • 2.Qf3#
    • 1...Sg2
      • 2.Qf3#
    • 1...Sc4
      • 2.Qf3#
    • 1...Sg4
      • 2.Qf3#
    • 1...Sxd5
      • 2.Qf3#
    • 1...Sd4
      • 2.Sc3#
  • Tries
    • 1.Qc4+?
      • 1...Sd4
        • 2.Sc3#
        • 2.Qxd4#
      • 1...Sxc4!
  • Keys
    • 1.Rde8!
      • threat
        • 2.Rxe7#
      • 1...Sxd5
        • 2.Qf3#
      • 1...Sc4
        • 2.Qf3#
      • 1...Sg4
        • 2.Qf3#
      • 1...Sf5
        • 2.Sf6#
      • 1...Sd4
        • 2.Sc3#
      • 1...e5
        • 2.Rf4#
      • 1...e6
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • S(b);OGATE::QAB1(C)
    • S(b);OGATE,SBLOCK,XP(E)::QAB1(C)
    • S(d);N_GUARD,SBLOCK::S(B)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • S(b);XQ(C)
  • Actual
    • R(H);P_PINP(g)
    • Threat
      • R(H),XP(g)
    • Vars
      • S(b);OGATE,SBLOCK,XP(E)::QAB1(C)
      • S(b);OGATE::QAB1(C)
      • S(b);SBLOCK::S(F)
      • S(d);N_GUARD,SBLOCK::S(B)
      • P(g);::R1(I)
      • P(g);OGATE::R(H),XP(g)
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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).