MESON Chess Problem Database

Problem Display
PID: 108307 (3B4/8/8/3Q4/1k6/8/1Pp5/K7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Stella Polaris, 1969

3B4/8/8/3Q4/1k6/8/1Pp5/K7

#2

4 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qc4#
  • Tries
    • 1.Qa5+?
      • 1...Kb3
        • 2.Qb5#
      • 1...Kc4!
    • 1.Qc5+?
      • 1...Kb3
        • 2.Qb5#
      • 1...Ka4
        • 2.Qc4#
      • 1...Kxc5!
  • Keys
    • 1.Be7+!
      • 1...Ka4
        • 2.b3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • B(D);CHECK
    • Vars
      • K(b);P-FLIGHT::P(B)
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