MESON Chess Problem Database

Problem Display
PID: 51285 (5N1K/Q1p2p2/1Nk4p/1pb2n1r/3p4/4nR2/q5B1/2R5 w - - 0 1)

Sumner, Christopher Richard Benson

Manchester Guardian, 1956

5N1K/Q1p2p2/1Nk4p/1pb2n1r/3p4/4nR2/q5B1/2R5

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Rf6#
    • 1...Sh4
      • 2.Rf6#
    • 1...Se7
      • 2.Rf6#
    • 1...Sg7
      • 2.Rf6#
    • 1...cxb6
      • 2.Qd7#
  • Tries
    • 1.Rxc5+?
      • 1...Kd6
        • 2.Sc8#
        • 2.Qxc7#
      • 1...Kxc5!
    • 1.Rxf5+?
      • 1...Kd6
        • 2.Sc8#
      • 1...Qd5
        • 2.Rf6#
      • 1...Qxg2
        • 2.Rf6#
      • 1...Sd5
        • 2.Rf6#
      • 1...Sxg2!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Rxc5#
      • 1...Kd5
        • 2.Rxf5#
      • 1...Qxa7
        • 2.Rxe3#
      • 1...Qc4
        • 2.Qa8#
      • 1...Qd5
        • 2.Qa6#
        • 2.Qa8#
      • 1...Qc2
        • 2.Qa8#
      • 1...Qa3
        • 2.Rxe3#
      • 1...Sc2
        • 2.Rb3#
      • 1...Sc4
        • 2.Rf2#
      • 1...Sg3
        • 2.Rf6#
      • 1...Sh4
        • 2.Rf6#
      • 1...Sd6
        • 2.Se7#
      • 1...Se7
        • 2.Rf6#
      • 1...Sg7
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • S(f);OGATE::B(B)+R(C),DCHECK
    • P(j);OGATE,SBLOCK,XS(D)::QAB1(E)
  • Tries
    • Try
      • R(A);CHECK,XB(e)
      • Refutation
        • K(h);P-FLIGHT,XR(A)
    • Try
      • R(C);CHECK,XS(f)
      • Vars
        • K(h);N_SPINB(e),P-FLIGHT::S(D)
        • Q(a);P_SPINQ(a)::R(C)
        • Q(a);XB(B)::R(C)
        • S(b);P_SPINS(b)::R(C)
      • Refutation
        • S(b);XB(B)
  • Actual
    • S(D);
    • Threat
      • R1(A),XB(e)
    • Vars
      • K(h);N_SPINB(e),S_FLIGHT::B(B)+R(C),DCHECK,XS(f)
      • Q(a);N_GUARD,XQ(E)::B(B)+R(C),XS(b)
      • Q(a);N_GUARD,N_SPINB(e)::QAB(E)
      • Q(a);N_GUARD::B(B)+R(C),XS(b)
      • S(b);N_SPINB(e),OGATE::B(B)+R(C)
      • S(b);N_GUARD,N_SPINB(e),S_CUTQ(a)::B(B)+R(C)
      • S(f);OGATE::B(B)+R(C),DCHECK
      • S(f);N_GUARD,SBLOCK::S(D)
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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).