MESON Chess Problem Database

Problem Display
PID: 52472 (b1N5/3p1p2/3P1P2/q2knpP1/1PRNR1p1/pQB5/8/7K w - - 0 1)

Sydenham, Colin Peter

2nd HM., Het Belgisch Schaakbord (L'Echiquier Belge), 1985-1986

b1N5/3p1p2/3P1P2/q2knpP1/1PRNR1p1/pQB5/8/7K

#2

11 + 9

5110 Bekroonde Problemen 2002
56 The Problemist 2006
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...fxe4
      • 2.Rc5#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Rxe5#
      • 1...Ke6
        • 2.Rc5#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Sxc6
        • 2.Rcd4#
      • 1...fxe4
        • 2.Rc5#
      • 1...Sd3
        • 2.S6e7#
      • 1...Sf3
        • 2.S6e7#
      • 1...Sg6
        • 2.Qd1#
      • 1...Qc5!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Rxe5#
      • 1...Ke6
        • 2.Rc6#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...fxe4
        • 2.Rc5#
      • 1...Sd3
        • 2.Se7#
      • 1...Sf3
        • 2.Se7#
      • 1...Sc6
        • 2.Rcd4#
      • 1...Sg6
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(f);SBLOCK,XR(G)::QAB(B)+R(E),DCHECK
  • Tries
    • Try
      • S(F);
      • Threat
        • R1(G),XS(e)
      • Vars
        • K(d);P_SPINS(e),S_FLIGHT::QAB(B)+R(E)
        • S(e);OGATE,P_SPINS(e),XR(E)::QAB1(B),XS(e)
        • S(e);SBLOCK,XS(F)::QAB(B)+R(E),DCHECK
        • P(f);SBLOCK,XR(G)::QAB(B)+R(E),DCHECK
        • S(e);::S(F)
        • S(e);N_GUARD::QAR(B)
      • Refutation
        • Q(c);
  • Actual
    • S(F);
    • Threat
      • R1(G),XS(e)
    • Vars
      • K(d);P_PINR(G),P_SPINS(e),S_FLIGHT::QAB(B)+R(E)
      • S(e);OGATE,P_SPINS(e),XR(E)::QAB1(B),XS(e)
      • P(f);SBLOCK,XR(G)::QAB(B)+R(E),DCHECK
      • S(e);::S(K)
      • S(e);SBLOCK::QAB(B)+R(E),DCHECK
      • S(e);N_GUARD::QAR(B)
HTML5 logo

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).