MESON Chess Problem Database

Problem Display
PID: 18172 (4K3/pRR5/k3B1np/8/8/1N6/4r2r/4bQ1n w - - 0 1)

Sprague, Gordon

Time & Tide, 1953

4K3/pRR5/k3B1np/8/8/1N6/4r2r/4bQ1n

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bf2
      • 2.Qxe2#
    • 1...Ba5
      • 2.Sc5#
    • 1...Se7
      • 2.Bc4#
  • Tries
    • 1.Rb4?
      • threat
        • 2.Rc6#
      • 1...Bf2
        • 2.Qxe2#
      • 1...Se5
        • 2.Bc8#
      • 1...Se7
        • 2.Bc4#
      • 1...Bxb4!
  • Keys
    • 1.Rb8!
      • threat
        • 2.Rc6#
      • 1...Bf2
        • 2.Qxe2#
      • 1...Ba5
        • 2.Sc5#
      • 1...Se5
        • 2.Bc8#
      • 1...Se7
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(a);S_CUTR(d)::QAB(A),XR(c)
    • B(a);SBLOCK::S(B)
    • S(f);N_PINB(C)::B(C)
  • Tries
    • Try
      • R(D);
      • Threat
        • R(E)
      • Vars
        • B(a);S_CUTR(d)::QAB(A),XR(c)
        • S(f);N_PINB(C)::B(C)
      • Refutation
        • B(a);XR(D)
  • Actual
    • R(D);
    • Threat
      • R(E)
    • Vars
      • B(a);S_CUTR(d)::QAB(A),XR(c)
      • B(a);SBLOCK::S(B)
      • S(f);N_PINB(C)::B(C)
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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).