MESON Chess Problem Database

Problem Display
PID: 229602 (4Q1B1/8/p2R4/P1pb4/2k1N3/8/8/B3K3 w - - 0 1)

Townsend, Alonzo

English Mechanic and World of Science, 1879

(First published on Fri Jan 17 1879)

4Q1B1/8/p2R4/P1pb4/2k1N3/8/8/B3K3

#2

7 + 4

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be6
      • 2.Qa4#
    • 1...Bf7
      • 2.Qa4#
    • 1...Bxg8
      • 2.Qa4#
  • Tries
    • 1.Sd2+?
      • 1...Kd3
        • 2.Bh7#
        • 2.Qe4#
      • 1...Kb4!
    • 1.Qb8?
      • 1...Bxg8
        • 2.Sd2#
      • 1...Be6
        • 2.Sd2#
        • 2.Bxe6#
      • 1...Bf7
        • 2.Sd2#
        • 2.Bxf7#
      • 1...Kd3!
  • Keys
    • 1.Sc3!
      • 1...Kb3
        • 2.Qa4#
      • 1...Kd3
        • 2.Qe4#
      • 1...Kb4
        • 2.Qa4#
      • 1...Kd4
        • 2.Qe4#
      • 1...Bxg8
        • 2.Qa4#
      • 1...Be6
        • 2.Qa4#
      • 1...Bf7
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(c);::QAR2(F)
    • B(c);N_SPINB(c),XB(G)::QAR2(F)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);N_SPINB(c),P-FLIGHT
    • Try
      • Q(F);
      • Vars
        • B(c);N_SPINB(c),XB(G)::S(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT::QAB1(F)
      • K(a);N_SPINB(c),P-FLIGHT::QAR1(F)
      • K(a);P-FLIGHT::QAR1(F)
      • B(c);N_SPINB(c),XB(G)::QAR2(F)
      • B(c);::QAR2(F)
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