MESON Chess Problem Database

Problem Display
PID: 262375 (2n5/1R6/2N5/1N1p4/k7/2B5/nK6/8 w - - 0 1)

Sydenham, Colin Peter

Europe Echecs, 1977

2n5/1R6/2N5/1N1p4/k7/2B5/nK6/8

#2

5 + 4

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc3
      • 2.Sxc3#
  • Tries
    • 1.Sa3?
      • 1...Sxc3
        • 2.Rb4#
      • 1...Sc1
        • 2.Rb4#
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sb6
        • 2.Ra7#
      • 1...Sd6
        • 2.Ra7#
      • 1...Sa7
        • 2.Rxa7#
      • 1...Se7
        • 2.Ra7#
      • 1...d4!
    • 1.Sc7?
      • 1...Sxc3
        • 2.Rb4#
      • 1...Sc1
        • 2.Rb4#
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sb6
        • 2.Ra7#
      • 1...Sd6
        • 2.Ra7#
      • 1...Sa7
        • 2.Rxa7#
      • 1...Se7
        • 2.Ra7#
      • 1...d4!
  • Keys
    • 1.Sbd4!
      • 1...Sxc3
        • 2.Rb4#
      • 1...Sc1
        • 2.Rb4#
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sb6
        • 2.Ra7#
      • 1...Sd6
        • 2.Ra7#
      • 1...Sa7
        • 2.Rxa7#
      • 1...Se7
        • 2.Ra7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);XB(B)::S(C),XS(a)
  • Tries
    • Try
      • S(C);
      • Vars
        • S(a);N_GUARD,XB(B)::R1(E)
        • S(a);N_GUARD::R1(E)
        • S(a);N_GUARD::R1(E),XS(a)
        • S(d);N_GUARD::R(E)
        • S(d);N_GUARD::R(E),XS(d)
      • Refutation
        • P(c);
    • Try
      • S(C);
      • Vars
        • S(a);N_GUARD,XB(B)::R1(E)
        • S(a);N_GUARD::R1(E)
        • S(a);N_GUARD::R1(E),XS(a)
        • S(d);N_GUARD::R(E)
        • S(d);N_GUARD::R(E),XS(d)
      • Refutation
        • P(c);
  • Actual
    • S(C);
    • Vars
      • S(a);N_GUARD,XB(B)::R1(E)
      • S(a);N_GUARD::R1(E)
      • S(a);N_GUARD::R1(E),XS(a)
      • S(d);N_GUARD::R(E)
      • S(d);N_GUARD::R(E),XS(d)
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