MESON Chess Problem Database

Problem Display
PID: 287245 (8/p7/kN6/2P5/2KQ4/8/8/8 w - - 0 1)

Chebanov, Nikolai V

Sp. HM., 64 Shakhmatnoe obozrenie, 1986

8/p7/kN6/2P5/2KQ4/8/8/8

#2

4 + 2

15601 Albrecht-Leiss-Degener Collection 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qa1#
  • Tries
    • 1.Sd5?
      • 1...Ka5
        • 2.Qa1#
      • 1...Kb7!
    • 1.Sd7?
      • 1...Ka5
        • 2.Qa1#
      • 1...Kb7!
    • 1.Sa8?
      • 1...Ka5
        • 2.Qa1#
      • 1...Kb7!
    • 1.Sc8?
      • 1...Ka5
        • 2.Qa1#
      • 1...Kb7!
    • 1.Qb2?
      • 1...Ka5
        • 2.Qa1#
        • 2.Qa3#
        • 2.Qa2#
        • 2.Qb5#
      • 1...axb6
        • 2.Qxb6#
      • 1...Kb7!
    • 1.Qf6?
      • 1...Ka5
        • 2.Qa1#
      • 1...axb6
        • 2.Qxb6#
      • 1...Kb7!
    • 1.Qg7?
      • 1...Ka5
        • 2.Qa1#
        • 2.Qxa7#
      • 1...axb6!
    • 1.Qe4?
      • 1...axb6
        • 2.Qa8#
      • 1...Ka5!
    • 1.Qd5?
      • 1...axb6
        • 2.Qa8#
      • 1...Ka5!
    • 1.Qd7?
      • 1...Ka5
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qxa7#
      • 1...axb6!
    • 1.Qd8?
      • 1...Kb7
        • 2.Qc8#
      • 1...axb6
        • 2.Qxb6#
        • 2.Qa8#
      • 1...Ka5!
    • 1.c6?
      • 1...axb6
        • 2.Qa1#
      • 1...Ka5!
  • Keys
    • 1.Qh8!
      • 1...Ka5
        • 2.Qa1#
      • 1...Kb7
        • 2.Qc8#
      • 1...axb6
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,P-FLIGHT::QAR(B)
  • Tries
    • Try
      • S(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • P(b);OGATE,XS(D)::QAR1(B),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR(B)
        • P(b);OGATE,P_SPINP(b),XS(D)::QAR1(B),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Refutation
        • P(b);XS(D)
    • Try
      • Q(B);
      • Vars
        • P(b);OGATEB,XS(D)::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • P(b);OGATEB,XS(D)::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Refutation
        • P(b);XS(D)
    • Try
      • Q(B);
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(C);
      • Vars
        • P(b);SBLOCK,XS(D)::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);N_GUARD,P-FLIGHT::QAR(B)
      • K(a);N_GUARD,S_FLIGHT::QAB1(B)
      • P(b);OGATEB,XS(D)::QAR2(B)
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