MESON Chess Problem Database

Problem Display
PID: 260862 (4K3/8/4N3/3k4/2N3P1/8/7Q/3B4 w - - 0 1)

Dikusarov, Andrey Nikolayovich

Neue Zurcher Zeitung, 2009

4K3/8/4N3/3k4/2N3P1/8/7Q/3B4

#2

6 + 1

5454 Near Snap 2022
6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.Qe5#
      • 2.Qd6#
  • Tries
    • 1.Be2?
      • 1...Ke4
        • 2.Qe5#
        • 2.Qh1#
        • 2.Qg2#
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
      • 1...Kc6!
    • 1.Bf3+?
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qh6#
      • 1...Kxc4!
    • 1.Qg3?
      • 1...Kxc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
      • 1...Kc6!
    • 1.Qf4?
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qf5#
        • 2.Qf7#
      • 1...Kc6!
    • 1.Qe5+?
      • 1...Kc6
        • 2.Sd8#
        • 2.Bf3#
      • 1...Kxc4!
    • 1.Qd6+?
      • 1...Ke4
        • 2.Sc5#
        • 2.Sg5#
        • 2.Qd4#
      • 1...Kxc4!
    • 1.Qc7?
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qc6#
        • 2.Qf7#
      • 1...Ke4!
    • 1.Qb8?
      • 1...Kxc4
        • 2.Qb3#
      • 1...Kc6
        • 2.Bf3#
      • 1...Kxe6
        • 2.Qe5#
        • 2.Qd6#
      • 1...Ke4!
    • 1.Qh1+?
      • 1...Kxe6
        • 2.Qc6#
      • 1...Kxc4!
    • 1.Qc2?
      • 1...Kxe6
        • 2.Qf5#
      • 1...Kc6!
    • 1.Qd2+?
      • 1...Ke4
        • 2.Sc5#
        • 2.Sg5#
        • 2.Qd4#
      • 1...Kc6
        • 2.Qd7#
      • 1...Kxe6
        • 2.Qd6#
      • 1...Kxc4!
    • 1.Qg2+?
      • 1...Kxe6
        • 2.Qc6#
      • 1...Kxc4!
    • 1.Qh5+?
      • 1...Ke4
        • 2.Qf5#
      • 1...Kc6
        • 2.Bf3#
      • 1...Kxe6
        • 2.Qf7#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Kxc4!
    • 1.Qh7?
      • 1...Kc6
        • 2.Qd7#
      • 1...Kxe6
        • 2.Qf5#
        • 2.Qf7#
      • 1...Kxc4!
  • Keys
    • 1.Qb2!
      • 1...Kxc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kc6
        • 2.Bf3#
      • 1...Kxe6
        • 2.Qe5#

Anticipated by 255905(1984)

FEATURES

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