MESON Chess Problem Database

Problem Display
PID: 180229 (2Q5/q7/Bk2N3/8/1P6/4K3/8/8 w - - 0 1)

Lider, Valentin Viktorovich

Comm., Buletin Problemistic, 1987

2Q5/q7/Bk2N3/8/1P6/4K3/8/8

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Qxb7#
  • Tries
    • 1.Bf1?
      • 1...Qb8
        • 2.Qa6#
      • 1...Qa1
        • 2.Qc7#
      • 1...Qa2
        • 2.Qc7#
      • 1...Qa4
        • 2.Qc7#
      • 1...Qa5
        • 2.Qc7#
      • 1...Qa6
        • 2.Qxa6#
        • 2.Qc7#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qc7
        • 2.Qa6#
        • 2.Qxc7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qe7
        • 2.Qa6#
      • 1...Qf7
        • 2.Qa6#
      • 1...Qg7
        • 2.Qa6#
      • 1...Qh7
        • 2.Qa6#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qa3+!
    • 1.Be2?
      • 1...Qb8
        • 2.Qa6#
      • 1...Qa1
        • 2.Qc7#
      • 1...Qa2
        • 2.Qc7#
      • 1...Qa4
        • 2.Qc7#
      • 1...Qa5
        • 2.Qc7#
      • 1...Qa6
        • 2.Qxa6#
        • 2.Qc7#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qc7
        • 2.Qa6#
        • 2.Qxc7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qe7
        • 2.Qa6#
      • 1...Qf7
        • 2.Qa6#
      • 1...Qg7
        • 2.Qa6#
      • 1...Qh7
        • 2.Qa6#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qa3+!
    • 1.Bc4?
      • 1...Qb8
        • 2.Qa6#
      • 1...Qa1
        • 2.Qc7#
      • 1...Qa2
        • 2.Qc7#
      • 1...Qa4
        • 2.Qc7#
      • 1...Qa5
        • 2.Qc7#
      • 1...Qa6
        • 2.Qxa6#
        • 2.Qc7#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qc7
        • 2.Qa6#
        • 2.Qxc7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qe7
        • 2.Qa6#
      • 1...Qf7
        • 2.Qa6#
      • 1...Qg7
        • 2.Qa6#
      • 1...Qh7
        • 2.Qa6#
      • 1...Qa8
        • 2.Qc7#
      • 1...Qa3+!
  • Keys
    • 1.Bd3!
      • 1...Qb8
        • 2.Qa6#
      • 1...Qa1
        • 2.Qc7#
      • 1...Qa2
        • 2.Qc7#
      • 1...Qa3
        • 2.Qc7#
      • 1...Qa4
        • 2.Qc7#
      • 1...Qa5
        • 2.Qc7#
      • 1...Qa6
        • 2.Qxa6#
        • 2.Qc7#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qc7
        • 2.Qa6#
        • 2.Qxc7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qe7
        • 2.Qa6#
      • 1...Qf7
        • 2.Qa6#
      • 1...Qg7
        • 2.Qa6#
      • 1...Qh7
        • 2.Qa6#
      • 1...Qa8
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD::QAR1(E),XQ(b)
  • Tries
    • Try
      • B(C);
      • Vars
        • Q(b);N_GUARD::QAR1(E)
        • Q(b);N_GUARD::QAB1(E)
        • Q(b);SBLOCK::QAB1(E)
        • Q(b);N_GUARD,P_PINS(D)::QAR1(E)
      • Refutation
        • Q(b);CHECK
    • Try
      • B(C);
      • Vars
        • Q(b);N_GUARD::QAR1(E)
        • Q(b);N_GUARD::QAB1(E)
        • Q(b);SBLOCK::QAB1(E)
        • Q(b);N_GUARD,P_PINS(D)::QAR1(E)
      • Refutation
        • Q(b);CHECK
    • Try
      • B(C);
      • Vars
        • Q(b);N_GUARD::QAR1(E)
        • Q(b);N_GUARD::QAB1(E)
        • Q(b);SBLOCK::QAB1(E)
        • Q(b);N_GUARD,P_PINS(D)::QAR1(E)
      • Refutation
        • Q(b);CHECK
  • Actual
    • B(C);
    • Vars
      • Q(b);N_GUARD::QAR1(E)
      • Q(b);N_GUARD::QAB1(E)
      • Q(b);N_GUARD,P_PINB(C)::QAB1(E)
      • Q(b);SBLOCK::QAB1(E)
      • Q(b);N_GUARD,P_PINS(D)::QAR1(E)
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