MESON Chess Problem Database

Problem Display
PID: 185744 (Q3n1K1/R1b2ppN/3pkpP1/1N6/8/8/b1B5/8 w - - 0 1)

Ling, John Francis

Chess, 1957

Q3n1K1/R1b2ppN/3pkpP1/1N6/8/8/b1B5/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qe4#
    • 1...Bd5
      • 2.Qxe8#
    • 1...Ba5
      • 2.Qe4#
    • 1...Bb6
      • 2.Qe4#
    • 1...Bb8
      • 2.Qe4#
    • 1...Bd8
      • 2.Qe4#
    • 1...d5
      • 2.Qxe8#
  • Tries
    • 1.Sxc7+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Kd7
        • 2.Qxe8#
      • 1...Ke7
        • 2.Qxe8#
      • 1...Sxc7!
    • 1.Sf8+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke7!
  • Keys
    • 1.gxf7!
      • threat
        • 2.fxe8Q#
      • 1...Ke5
        • 2.Qe4#
      • 1...Kd7
        • 2.Qxe8#
      • 1...Ke7
        • 2.Qxe8#
      • 1...Ba5
        • 2.Qe4#
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Bb6
        • 2.Qe4#
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Bb8
        • 2.Qe4#
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Bd8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(c);P-FLIGHT::QAR1(F)
    • B(a);SBLOCK::QAR2(F),XS(h)
    • B(e);::QAR2(F)
    • P(b);SBLOCK::QAR2(F),XS(h)
  • Tries
    • Try
      • S(B);CHECK,XB(e)
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
        • K(c);S_FLIGHT::QAB1(F),XS(h)
        • K(c);P-FLIGHT::QAR1(F),XS(h)
      • Refutation
        • S(h);XS(B)
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • K(c);P-FLIGHT,P_SPINB(e)
  • Actual
    • P(C);XP(f)
    • Threat
      • PXS(h)=Q
    • Vars
      • K(c);P-FLIGHT,P_PINP(C)::QAR1(F)
      • K(c);P_PINP(C),P_SPINB(e),S_FLIGHT::QAB1(F),XS(h)
      • K(c);P-FLIGHT,P_PINP(C),P_SPINB(e)::QAR1(F),XS(h)
      • B(e);::QAR2(F)
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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).