MESON Chess Problem Database

Problem Display
PID: 215694 (1Q6/8/8/3k4/3N4/8/K7/5BB1 w - - 0 1)

Barrier, ?

La Strategie, 1881

1Q6/8/8/3k4/3N4/8/K7/5BB1

#2

5 + 1

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qg3?
      • 1...Ke4
        • 2.Bg2#
      • 1...Kc5!
    • 1.Qb5+?
      • 1...Ke4
        • 2.Qf5#
      • 1...Kd6!
    • 1.Qf8?
      • 1...Ke4
        • 2.Qf5#
      • 1...Ke5!
  • Keys
    • 1.Bh2!
      • threat
        • 2.Qe5#
      • 1...Kxd4
        • 2.Qe5#
      • 1...Ke4
        • 2.Qe5#
      • 1...Kc5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::B(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(B);
    • Threat
      • QAR1(E)
    • Vars
      • K(a);P-FLIGHT,XS(D)::QAB1(E)
      • K(a);S_FLIGHT::QAR1(E)
      • K(a);P-FLIGHT::QAB1(E)
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