MESON Chess Problem Database

Problem Display
PID: 18033 (Kb5R/8/8/7Q/5p2/5PB1/2Nn2k1/2R2Nr1 w - - 0 1)

Ling, John Francis

Time & Tide, 1952

Kb5R/8/8/7Q/5p2/5PB1/2Nn2k1/2R2Nr1

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Qxh1#
    • 1...Sxf3
      • 2.Qh3#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Qh2#
        • 2.Qh3#
      • 1...Rxf1
        • 2.Qh2#
      • 1...Sxf1
        • 2.Qh3#
      • 1...Sxf3
        • 2.Qxf3#
        • 2.Qh3#
      • 1...Rh1
        • 2.Qxh1#
      • 1...fxg3!
    • 1.Be1?
      • threat
        • 2.Qh3#
      • 1...Rxf1
        • 2.Rg8#
        • 2.Qg4#
      • 1...Rh1
        • 2.Qxh1#
      • 1...Kxf1!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Rh2#
      • 1...Rxf1
        • 2.Be1#
      • 1...Sxf1
        • 2.Se1#
      • 1...Sxf3
        • 2.Qh3#
      • 1...Rh1
        • 2.Bh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::QAB1(F),XR(a)
    • S(b);SBLOCK,XP(D)::QAB1(F)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XS(B)::QAR1(F)
        • S(b);XS(B)::QAB1(F)
        • R(a);N_GUARD::QAB1(F),XR(a)
      • Refutation
        • P(d);XB(E)
    • Try
      • B(E);
      • Threat
        • QAB1(F)
      • Vars
        • R(a);N_GUARD::QAB1(F),XR(a)
      • Refutation
        • K(c);S_FLIGHT,XS(B)
  • Actual
    • Q(F);
    • Threat
      • R1(H)
    • Vars
      • R(a);SBLOCK,XS(B)::QAR(F)+B(E)
      • S(b);SBLOCK,XS(B)::S(C)
      • S(b);SBLOCK,XP(D)::QAB1(F)
      • R(a);SBLOCK::QAR(F)+B(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).