MESON Chess Problem Database

Problem Display
PID: 6915 (8/Q2p1B2/2k5/4pN2/K7/8/8/8 w - - 0 1)

Lebedev, Aleksandr N

The Problemist, 1934

8/Q2p1B2/2k5/4pN2/K7/8/8/8

#2

4 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Be8#
    • 1...d6
      • 2.Se7#
  • Tries
    • 1.Kb4?
      • 1...d5
        • 2.Be8#
      • 1...d6
        • 2.Se7#
      • 1...e4!
    • 1.Bc4?
      • 1...d5
        • 2.Bb5#
      • 1...d6
        • 2.Se7#
      • 1...e4!
    • 1.Qa6+?
      • 1...Kc5
        • 2.Qb5#
        • 2.Qd6#
      • 1...Kc7!
    • 1.Qb7+?
      • 1...Kc5
        • 2.Qb5#
        • 2.Qc7#
      • 1...Kxb7!
  • Keys
    • 1.Ka5!
      • threat
        • 2.Qb6#
      • 1...d5
        • 2.Be8#
      • 1...d6
        • 2.Se7#

This anticipates 17576(1947)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,SBLOCK::B(D)
    • P(c);SBLOCK::S(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);OGATEB,SBLOCK::B(D)
        • P(c);SBLOCK::S(B)
      • Refutation
        • P(a);
    • Try
      • B(D);
      • Vars
        • P(c);SBLOCK::B(D)
        • P(c);SBLOCK::S(B)
      • Refutation
        • P(a);
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • K(A);P-FLIGHT
    • Threat
      • QAR1(C)
    • Vars
      • P(c);OGATEB,SBLOCK::B(D)
      • P(c);SBLOCK::S(B)
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