MESON Chess Problem Database

Problem Display
PID: 15344 (8/1k6/2NQ4/8/2K5/1N6/8/8 w - - 0 1)

Chebanov, Nikolai V

Shakhmaty v SSSR, 1982

8/1k6/2NQ4/8/2K5/1N6/8/8

#2

4 + 1

3296 Shakhmatny zadachi miniaturi 1987

SOLUTION

  • SOUND
  • Sets
    • 1...Ka8
      • 2.Qb8#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Qb8#
      • 1...Ka8
        • 2.Qb8#
      • 1...Kc8!
    • 1.Sc5+?
      • 1...Ka8
        • 2.Qb8#
        • 2.Qf8#
        • 2.Qd8#
      • 1...Kc8
        • 2.Sa7#
        • 2.Se7#
        • 2.Qb8#
        • 2.Qd7#
        • 2.Qd8#
      • 1...Kb6!
    • 1.Qc7+?
      • 1...Ka6
        • 2.Sc5#
        • 2.Sb4#
        • 2.Sb8#
        • 2.Qa7#
      • 1...Ka8
        • 2.Qb8#
        • 2.Qa7#
        • 2.Qc8#
      • 1...Kxc7!
    • 1.Qb8+?
      • 1...Ka6
        • 2.Sc5#
        • 2.Sb4#
        • 2.Qa7#
        • 2.Qb5#
      • 1...Kxc6!
    • 1.Qd7+?
      • 1...Ka6
        • 2.Qa7#
      • 1...Ka8
        • 2.Qc8#
        • 2.Qa7#
      • 1...Kb6!
  • Keys
    • 1.Qd8!
      • 1...Ka6
        • 2.Sc5#
      • 1...Kxc6
        • 2.Sa5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAR1(D)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR1(D)
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(a);S_FLIGHT::S(A)
      • K(a);S_FLIGHT,XS(C)::S(A)
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