MESON Chess Problem Database

Problem Display
PID: 252104 (8/N1P1P3/1k6/2N5/8/Q3K3/8/8 w - - 0 1)

Chernikh, Vassily

Zadachi i Etyudi, 2004

8/N1P1P3/1k6/2N5/8/Q3K3/8/8

#2

6 + 1

3713 Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sd7+?
      • 1...Kb7
        • 2.c8Q#
      • 1...Kxc7!
    • 1.Qb2+?
      • 1...Ka5
        • 2.Sc6#
        • 2.Qb5#
      • 1...Kxc5
        • 2.Qd4#
      • 1...Kxa7
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kxc7!
    • 1.Qb4+?
      • 1...Kxa7
        • 2.Qa5#
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kxc7!
    • 1.Qa1?
      • 1...Kxc5
        • 2.Qd4#
      • 1...Kxc7!
    • 1.Qc3?
      • 1...Kxa7
        • 2.Qa5#
      • 1...Kxc7!
    • 1.Qa4?
      • 1...Kxc5
        • 2.Qd4#
      • 1...Kxc7!
  • Keys
    • 1.Qd3!
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxc5
        • 2.Qd4#
      • 1...Kxa7
        • 2.Qa6#
      • 1...Kxc7
        • 2.Qd8#

Anticipated by 249546(1985)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::P=Q
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(A);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(A);
      • Vars
        • K(a);N_GUARD,S_FLIGHT,XS(D)::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(A);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
  • Actual
    • Q(A);
    • Vars
      • K(a);N_GUARD,S_FLIGHT::QAR1(A)
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • K(a);N_GUARD,S_FLIGHT,XS(D)::QAR1(A)
      • K(a);OGATEB,S_FLIGHT,XP(E)::QAB1(A)
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