MESON Chess Problem Database

Problem Display
PID: 260944 (1b6/1p4nB/8/1KPpNr2/Q1pk2NR/2r1pRP1/4p3/B7 w - - 0 1)

Sydenham, Colin Peter

Neue Zurcher Zeitung, 1982

1b6/1p4nB/8/1KPpNr2/Q1pk2NR/2r1pRP1/4p3/B7

#2

10 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Rf4#
    • 1...Rxf3
      • 2.Sxf3#
    • 1...Rf4
      • 2.Rxf4#
    • 1...Rg5
      • 2.Rf4#
    • 1...Rh5
      • 2.Rf4#
  • Tries
    • 1.Bxc3+?
      • 1...Ke4
        • 2.Sf2#
        • 2.Sh2#
        • 2.Sxe3#
        • 2.Sf6#
        • 2.Sh6#
        • 2.Rxe3#
        • 2.Rf4#
        • 2.Qc2#
      • 1...Kxc3!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.Sce5#
      • 1...Kd3
        • 2.Sf2#
      • 1...Ke4
        • 2.Sge5#
      • 1...dxc4
        • 2.Qxc4#
      • 1...Re5
        • 2.Sd2#
        • 2.Sa3#
        • 2.Scxe3#
        • 2.Sa5#
        • 2.Scxe5#
        • 2.Sb6#
        • 2.Sd6#
        • 2.Sgxe5#
      • 1...Be5
        • 2.Scxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • K(e);N_SPINR(b),P-FLIGHT,P_SPINR(g)::R1(B)
    • R(g);XR(B)::S(I),XR(g)
    • R(g);N_GUARD::R(B),XR(g)
    • R(g);N_GUARD::R(B)
  • Tries
    • Try
      • B(A);CHECK,XR(b)
      • Refutation
        • K(e);N_SPINP(d),P_SPINP(c),S_FLIGHT,XB(A)
  • Actual
    • S(I);XP(d)
    • Threat
      • QAR(D)+S(I)
    • Vars
      • K(e);N_SPINR(b),P-FLIGHT,P_SPINP(c),P_SPINR(g),S_CUTB(j)::S(E)
      • K(e);N_SPINR(b),P-FLIGHT,P_SPINR(g)::R(F)+S(E)
      • P(f);OGATE,P_PINP(H),P_SPINP(f),XS(I)::QAR1(D),XP(f)
      • B(j);::QAR(D)+S(I),XB(j)
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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).