MESON Chess Problem Database

Problem Display
PID: 231073 (1Q6/1p3n2/1B6/1p6/k7/8/1K6/8 w - - 0 1)

Bostrom, Ernst

Allers Familje-Journal, 1927

1Q6/1p3n2/1B6/1p6/k7/8/1K6/8

#2

3 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kb4
      • 2.Qf4#
    • 1...b4
      • 2.Qe8#
  • Tries
    • 1.Kc3?
      • threat
        • 2.Qa7#
        • 2.Qa8#
      • 1...Ka3
        • 2.Qa7#
        • 2.Qa8#
      • 1...b4+!
    • 1.Bc5?
      • threat
        • 2.Qa7#
        • 2.Qa8#
      • 1...Ka5
        • 2.Qa7#
        • 2.Qa8#
      • 1...b4!
    • 1.Qg3?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...Kb4
        • 2.Qf4#
        • 2.Qh4#
        • 2.Qb3#
        • 2.Qg4#
      • 1...b4!
    • 1.Qd6?
      • threat
        • 2.Qa3#
      • 1...b4
        • 2.Qd7#
      • 1...Sxd6!
    • 1.Qf8?
      • threat
        • 2.Qa3#
      • 1...b4
        • 2.Qe8#
      • 1...Sd6!
  • Keys
    • 1.Qg8!
      • 1...Kb4
        • 2.Qg4#
      • 1...Se5
        • 2.Qb3#
      • 1...Sg5
        • 2.Qb3#
      • 1...Sd6
        • 2.Qb3#
      • 1...Sh6
        • 2.Qb3#
      • 1...Sd8
        • 2.Qb3#
      • 1...Sh8
        • 2.Qb3#
      • 1...b4
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR(C)
    • P(b);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);CHECK
    • Try
      • B(B);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • S(d);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • S(d);
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT::QAR(C)
      • S(d);OGATE::QAB1(C)
      • P(b);OGATEB,SBLOCK::QAB(C)
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