MESON Chess Problem Database

Problem Display
PID: 268506 (Q4RBR/4B3/1K2p1kP/6Np/b2n1p1p/1p6/1q6/4rr2 w - - 0 1)

Driver, John Edward

The Problemist, 1956

Q4RBR/4B3/1K2p1kP/6Np/b2n1p1p/1p6/1q6/4rr2

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Be8
      • 2.Qxe8#
    • 1...Se2
      • 2.Qe4#
    • 1...Sb5
      • 2.Qe8#
    • 1...Sf5
      • 2.Bf7#
    • 1...Sc6
      • 2.Qe8#
  • Tries
    • 1.Rxf4?
      • threat
        • 2.Bf7#
      • 1...Be8
        • 2.Qxe8#
      • 1...Rxf4!
    • 1.Qe4+?
      • 1...Sf5
        • 2.Bf7#
      • 1...Rxe4!
  • Keys
    • 1.Sh3!
      • threat
        • 2.Rf6#
      • 1...Sc2
        • 2.Qg2#
      • 1...Se2
        • 2.Qe4#
      • 1...Sf3
        • 2.Sxf4#
      • 1...Sb5
        • 2.Qe8#
      • 1...Sf5
        • 2.Bf7#
      • 1...Sc6
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(e);N_GUARD::QAB(E),XB(e)
    • S(f);N_GUARD,S_CUTR(a)::QAB(E)
    • S(f);S_CUTB(e)::QAB(E)
    • S(f);SBLOCK::B(G)
  • Tries
    • Try
      • R(F);XP(g)
      • Threat
        • B(G)
      • Vars
        • B(e);N_GUARD::QAB(E),XB(e)
      • Refutation
        • R(b);XR(F)
    • Try
      • Q(E);CHECK
      • Vars
        • S(f);P_SPINS(f)::B(G)
      • Refutation
        • R(a);XQ(E)
  • Actual
    • S(A);
    • Threat
      • R1(F)
    • Vars
      • S(f);S_CUTQ(c)::QAR(E)
      • S(f);N_GUARD,S_CUTR(a)::QAB(E)
      • S(f);S_CUTR(b)::S(A),XP(g)
      • S(f);S_CUTB(e)::QAB(E)
      • S(f);SBLOCK::B(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).