MESON Chess Problem Database

Problem Display
PID: 5982 (4N1QB/1K2k1P1/4N3/8/8/8/8/8 w - - 0 1)

Lazard, Frederic

Bulletin de la FFE, 1926

4N1QB/1K2k1P1/4N3/8/8/8/8/8

#2

6 + 1

6315 Mes problemes et etudes d'echecs (Lazard) 1929
3295 Einfuhrung in die Welt des Schachproblem 1984
2786 More Fun with Chess Miniatures 2000
5454 Near Snap 2013
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd7
      • 2.Qf7#
  • Tries
    • 1.Qf8+?
      • 1...Kd7
        • 2.Qf7#
      • 1...Kxe6!
  • Keys
    • 1.Qh7!
      • threat
        • 2.g8Q#
      • 1...Kxe6
        • 2.g8Q#
        • 2.g8B#
      • 1...Kd7
        • 2.g8Q#
      • 1...Kf7
        • 2.g8Q#
      • 1...Kxe8
        • 2.g8Q#
        • 2.g8R#

This anticipates 231145(1927), 17760(1949)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR2(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);P-FLIGHT,XS(A)
  • Actual
    • Q(E);
    • Threat
      • P=Q
    • Vars
      • K(a);P-FLIGHT,XS(A)::P=Q
      • K(a);P-FLIGHT::P=Q
      • K(a);P-FLIGHT,XS(D)::P=Q
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