MESON Chess Problem Database

Problem Display
PID: 196971 (1Q6/3p4/2P5/2k2K2/1p3N2/1P6/4N3/8 w - - 0 1)

Keysor, William Ellis

Brisbane Courier, 1919

1Q6/3p4/2P5/2k2K2/1p3N2/1P6/4N3/8

#2

6 + 3

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.c7?
      • threat
        • 2.c8Q#
        • 2.c8R#
      • 1...Kc6
        • 2.c8Q#
        • 2.c8R#
      • 1...d5
        • 2.c8Q#
        • 2.c8R#
      • 1...d6
        • 2.c8Q#
        • 2.c8R#
      • 1...Kd6!
  • Keys
    • 1.Sd4!
      • 1...Kxd4
        • 2.Qe5#
      • 1...dxc6
        • 2.Sde6#
      • 1...d5
        • 2.Sfe6#
      • 1...d6
        • 2.Qa7#

Anticipated by 158390(1906-1907)

This anticipates 75104(1923)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • P(E);
      • Threat
        • P=Q
      • Vars
        • K(b);P-FLIGHT::P=Q
        • P(c);::P=Q
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(A);
    • Vars
      • K(b);S_FLIGHT,XS(A)::QAB1(F)
      • P(c);N_GUARD,SBLOCK,XP(E)::S(A)
      • P(c);N_GUARD,SBLOCK::S(C)
      • P(c);SBLOCK::QAB(F)
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