MESON Chess Problem Database

Problem Display
PID: 203240 (4k3/1NQ4N/8/8/4n3/8/8/4K3 w - - 0 1)

Lester, William Edward

Chess Amateur (The), 1924

4k3/1NQ4N/8/8/4n3/8/8/4K3

#2

4 + 2

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Sd6#
    • 1...Sf2
      • 2.Sd6#
    • 1...Sc3
      • 2.Sd6#
    • 1...Sg3
      • 2.Sd6#
    • 1...Sc5
      • 2.Sd6#
    • 1...Sg5
      • 2.Sd6#
    • 1...Sd6
      • 2.Sxd6#
    • 1...Sf6
      • 2.Sd6#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Qd8#
        • 2.Qf7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Sd6
        • 2.Qd8#
      • 1...Sxg5!
  • Keys
    • 1.Qg7!
      • 1...Sd2
        • 2.Sf6#
      • 1...Sf2
        • 2.Sf6#
      • 1...Sc3
        • 2.Sf6#
      • 1...Sg3
        • 2.Sf6#
      • 1...Sc5
        • 2.Sf6#
      • 1...Sg5
        • 2.Sf6#
      • 1...Sd6
        • 2.Sf6#
      • 1...Sf6
        • 2.Sxf6#

This anticipates 6850(1934)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 8
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::S(B)
    • S(a);N_GUARD::S(B),XS(a)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
        • S(a);::QAR1(C)
      • Refutation
        • S(a);XS(D)
  • Actual
    • Q(C);
    • Vars
      • S(a);N_GUARD::S(D)
      • S(a);N_GUARD::S(D),XS(a)
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Developed and maintained by Brian Stephenson.
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