MESON Chess Problem Database

Problem Display
PID: 245085 (8/8/8/1BQ5/1p6/B7/n5K1/3k4 w - - 0 1)

Froberg, Johan Hilding Laurentius

Schackvarlden, 1942

8/8/8/1BQ5/1p6/B7/n5K1/3k4

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qxc1#
  • Tries
    • 1.Qd4+?
      • 1...Kc2
        • 2.Qd3#
      • 1...Ke1!
    • 1.Qd6+?
      • 1...Kc2
        • 2.Qd3#
      • 1...Ke1!
    • 1.Qc2+?
      • 1...Ke1
        • 2.Qe2#
      • 1...Kxc2!
    • 1.Qd5+?
      • 1...Kc2
        • 2.Qd3#
      • 1...Ke1!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qe2#
      • 1...Kc2
        • 2.Qd3#
      • 1...bxa3
        • 2.Ba4#
      • 1...Sc1
        • 2.Qxc1#
      • 1...Sc3
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(D),XS(b)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • K(a);S_FLIGHT::QAB1(D)
      • P(c);N_GUARD,XB(B)::B(C)
      • S(b);N_GUARD::QAR1(D),XS(b)
      • S(b);N_GUARD::QAR1(D)
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Developed and maintained by Brian Stephenson.
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