MESON Chess Problem Database

Problem Display
PID: 51444 (brk5/1NqN4/n4K2/B7/5P2/r6B/8/1QR5 w - - 0 1)

Baxter, FL

The Guardian, 1960

brk5/1NqN4/n4K2/B7/5P2/r6B/8/1QR5

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc1
      • 2.Sd6#
    • 1...Qc2
      • 2.Sd6#
    • 1...Qc3+
      • 2.Se5#
    • 1...Qc4
      • 2.Sd6#
    • 1...Qc5
      • 2.Sd6#
    • 1...Qc6+
      • 2.Sd6#
    • 1...Ra1
      • 2.Se5#
      • 2.Sf8#
    • 1...Ra2
      • 2.Se5#
      • 2.Sf8#
    • 1...Ra4
      • 2.Se5#
      • 2.Sf8#
    • 1...Rxa5
      • 2.Se5#
    • 1...Sb4
      • 2.Rxc7#
  • Tries
    • 1.Sdc5+?
      • 1...Qd7
        • 2.Sd6#
        • 2.Bxd7#
      • 1...Rxh3!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Sb6#
      • 1...Qc3+
        • 2.Se5#
      • 1...Qc6+
        • 2.Sd6#
      • 1...Qxc1
        • 2.Sd6#
      • 1...Rxb7
        • 2.Qe8#
      • 1...Bxb7
        • 2.Qe8#
      • 1...Qc2
        • 2.Sd6#
      • 1...Qc4
        • 2.Sd6#
      • 1...Qc5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_SPINQ(c),XR(B)::S(G)
    • Q(c);::S(G)
    • Q(c);CHECK,S_CUTR(a)::B(C)+S(H)
    • Q(c);CHECK::S(G)
    • R(a);N_GUARD,XB(E)::B(C)+S(H)
    • S(b);N_GUARD::R1(B),XQ(c)
  • Tries
    • Try
      • S(H);CHECK,N_PINQ(c)
      • Refutation
        • R(a);XB(C)
  • Actual
    • Q(A);
    • Threat
      • B(C)+S(H),DCHECK
    • Vars
      • Q(c);CHECK,S_CUTR(a)::B(C)+S(H)
      • Q(c);CHECK::S(G)
      • Q(c);N_SPINQ(c),XR(B)::S(G)
      • R(e);SBLOCK,XS(G)::QAR2(A)
      • B(d);SBLOCK,XS(G)::QAR2(A)
      • Q(c);::S(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).