MESON Chess Problem Database

Problem Display
PID: 258273 (8/5p2/5R2/3Pkn2/4N3/B7/3K2Q1/8 w - - 0 1)

Anonymous

English Mechanic and World of Science, 1890

(First published on Fri Dec 19 1890)

8/5p2/5R2/3Pkn2/4N3/B7/3K2Q1/8

#2

6 + 3

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Bd6#
  • Tries
    • 1.Sf2?
      • 1...Kd4
        • 2.Qe4#
      • 1...Kf4
        • 2.Sd3#
        • 2.Bd6#
      • 1...Se3
        • 2.Bb2#
      • 1...Sg3
        • 2.Bb2#
      • 1...Sd4
        • 2.Sg4#
      • 1...Sh4
        • 2.Bb2#
      • 1...Sd6
        • 2.Bb2#
      • 1...Sh6
        • 2.Bb2#
      • 1...Se7
        • 2.Bb2#
      • 1...Sg7
        • 2.Bb2#
      • 1...Kxf6!
  • Keys
    • 1.Sc5!
      • 1...Kd4
        • 2.Qe4#
      • 1...Kf4
        • 2.Sd3#
      • 1...Kxf6
        • 2.Sd7#
      • 1...Se3
        • 2.Bb2#
      • 1...Sg3
        • 2.Bb2#
      • 1...Sd4
        • 2.Sd7#
      • 1...Sh4
        • 2.Bb2#
      • 1...Sd6
        • 2.Bb2#
      • 1...Sh6
        • 2.Bb2#
      • 1...Se7
        • 2.Bb2#
      • 1...Sg7
        • 2.Bb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,P_SPINS(b),S_FLIGHT::B(C)
  • Tries
    • Try
      • S(D);
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAR1(B)
        • S(b);N_GUARD::B(C)
        • S(b);SBLOCK::S(D)
      • Refutation
        • K(a);S_FLIGHT,XR(F)
  • Actual
    • S(D);
    • Vars
      • K(a);N_GUARD,S_FLIGHT::QAR1(B)
      • K(a);N_GUARD,P_SPINS(b),S_FLIGHT::S(D)
      • K(a);N_GUARD,S_FLIGHT,XR(F)::S(D)
      • S(b);N_GUARD::B(C)
      • S(b);SBLOCK::S(D)
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