MESON Chess Problem Database

Problem Display
PID: 230671 (2n5/1nQ1p3/N3B3/8/3kp2p/4p2P/3pP3/3K4 w - - 0 1)

Fisher, JB

English Mechanic and World of Science, 1879

(First published on Fri Aug 1 1879)

2n5/1nQ1p3/N3B3/8/3kp2p/4p2P/3pP3/3K4

#2

6 + 8

5454 Near Snap 2021
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sbd6
      • 2.Qc5#
    • 1...Sd8
      • 2.Qc5#
  • Tries
    • 1.Qg3?
      • threat
        • 2.Qg7#
      • 1...Kc3
        • 2.Qe5#
        • 2.Qg7#
      • 1...hxg3!
    • 1.Qxc8?
      • threat
        • 2.Qh8#
      • 1...Sd8
        • 2.Qc5#
      • 1...Ke5!
  • Keys
    • 1.Qb8!
      • 1...Kc3
        • 2.Qe5#
      • 1...Sbd6
        • 2.Qb2#
      • 1...Scd6
        • 2.Qh8#
      • 1...Sb6
        • 2.Qh8#
      • 1...Sa5
        • 2.Qb2#
      • 1...Sc5
        • 2.Qb2#
      • 1...Sd8
        • 2.Qb2#
      • 1...Sa7
        • 2.Qh8#

Anticipated by 4500(1871), 4501(1871)

This anticipates 102776(1909), 140872(1953)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD::QAB1(F)
    • S(f);N_GUARD::QAB1(F),XS(f)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAB(F)
      • Refutation
        • P(e);XQ(F)
    • Try
      • Q(F);XS(h)
      • Threat
        • QAB(F)
      • Vars
        • S(f);N_GUARD::QAB1(F)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(F);
    • Vars
      • K(c);S_FLIGHT::QAB(F)
      • S(f);OGATE::QAB(F)
      • S(h);OGATE::QAB(F)
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