MESON Chess Problem Database

Problem Display
PID: 258264 (B1n5/5p2/7Q/4k3/1B5N/1n6/N7/3K4 w - - 0 1)

Anonymous

English Mechanic and World of Science, 1890

(First published on Fri Dec 12 1890)

B1n5/5p2/7Q/4k3/1B5N/1n6/N7/3K4

#2

6 + 4

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Bc3#
    • 1...Sc1
      • 2.Bc3#
    • 1...Sd2
      • 2.Bc3#
    • 1...Sa5
      • 2.Bc3#
    • 1...Sc5
      • 2.Bc3#
    • 1...Sb6
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sa7
      • 2.Qd6#
    • 1...Se7
      • 2.Qd6#
    • 1...f5
      • 2.Sf3#
    • 1...f6
      • 2.Qe3#
  • Tries
    • 1.Qf4+?
      • 1...Ke6
        • 2.Qf5#
      • 1...Kxf4!
  • Keys
    • 1.Sc1!
      • 1...Kd4
        • 2.Qf4#
      • 1...Sxc1
        • 2.Bc3#
      • 1...f6
        • 2.Qe3#
      • 1...Sa1
        • 2.Bc3#
      • 1...Sd2
        • 2.Bc3#
      • 1...Sd4
        • 2.Sd3#
      • 1...Sa5
        • 2.Bc3#
      • 1...Sc5
        • 2.Bc3#
      • 1...Sb6
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sa7
        • 2.Qd6#
      • 1...Se7
        • 2.Qd6#
      • 1...f5
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::B(C)
    • S(d);N_GUARD::QAB1(E)
    • S(d);N_GUARD::QAB1(E),XS(d)
    • P(c);SBLOCK::S(D)
    • P(c);SBLOCK::QAR2(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT,XQ(E)
  • Actual
    • S(B);
    • Vars
      • K(b);N_GUARD,S_FLIGHT::QAR2(E)
      • S(a);N_GUARD,XS(B)::B(C)
      • P(c);SBLOCK::QAR2(E)
      • S(a);N_GUARD::B(C)
      • S(a);SBLOCK::S(B)
      • S(d);N_GUARD::QAB1(E)
      • S(d);N_GUARD::QAB1(E),XS(d)
      • P(c);SBLOCK::S(D)
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