MESON Chess Problem Database

Problem Display
PID: 153215 (Q7/B7/N7/1k3B2/8/8/K7/8 w - - 0 1)

Murashev, Pavel Aleksandrovich

3rd Prize, StrateGems 02. Miniature Ty., 2011

Q7/B7/N7/1k3B2/8/8/K7/8

#2

5 + 1

5454 Near Snap 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qc6#
  • Tries
    • 1.Bc5?
      • 1...Ka4
        • 2.Sc7#
      • 1...Ka5
        • 2.Sc7#
      • 1...Kc4!
    • 1.Bb6?
      • 1...Ka4
        • 2.Bd7#
        • 2.Qc6#
        • 2.Qe8#
      • 1...Kc4
        • 2.Qc6#
      • 1...Kxb6!
    • 1.Qd5+?
      • 1...Ka4
        • 2.Bc2#
        • 2.Bd7#
      • 1...Kxa6!
    • 1.Qb7+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Kc4
        • 2.Qc6#
        • 2.Qb3#
      • 1...Ka5!
    • 1.Qb8+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Kc4
        • 2.Qb3#
      • 1...Kxa6
        • 2.Qb6#
      • 1...Kc6
        • 2.Sb4#
      • 1...Ka5!
  • Keys
    • 1.Qd8!
      • 1...Ka4
        • 2.Bd7#
      • 1...Kc4
        • 2.Qd3#
      • 1...Kxa6
        • 2.Qb6#
      • 1...Kc6
        • 2.Qd7#

Anticipated by 10692(1967), 219856(1974), 95064(1984), 124491(1998), 165525(1998), 168594(2005)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR2(E)
  • Tries
    • Try
      • B(D);
      • Vars
        • K(a);S_FLIGHT::QAR(E)+S(C)
        • K(a);P-FLIGHT::QAR(E)+S(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(D);
      • Vars
        • K(a);S_FLIGHT::QAR2(E)
      • Refutation
        • K(a);P-FLIGHT,XB(D)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
        • K(a);OGATE,S_FLIGHT::QAB1(E)
        • K(a);S_FLIGHT,XS(C)::QAR1(E)
        • K(a);S_FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::B(B)
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);S_FLIGHT,XS(C)::QAR1(E)
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