MESON Chess Problem Database

Problem Display
PID: 227648 (1K1B4/3p4/2k5/4Qn2/P7/8/8/8 w - - 0 1)

Harder, Karl

Frankische Arbeiter Schachzeitung, 1926

1K1B4/3p4/2k5/4Qn2/P7/8/8/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qc7#
    • 1...d6
      • 2.Qb5#
  • Tries
    • 1.Bc7?
      • threat
        • 2.Qb5#
      • 1...Sd4
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...d5!
    • 1.Be7?
      • threat
        • 2.Qb5#
        • 2.Qc5#
      • 1...Kb6
        • 2.Qb5#
      • 1...d5
        • 2.Qc7#
      • 1...d6
        • 2.Qb5#
      • 1...Sd4
        • 2.Qd6#
        • 2.Qc5#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sxe7!
  • Keys
    • 1.Bb6!
      • threat
        • 2.Qc5#
      • 1...Kxb6
        • 2.Qb5#
      • 1...d5
        • 2.Qc7#
      • 1...d6
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::QAR1(B)
    • P(c);SBLOCK::QAB1(B)
  • Tries
    • Try
      • B(D);
      • Threat
        • QAB1(B)
      • Vars
        • S(a);N_GUARD::QAR1(B)
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • P(c);
    • Try
      • B(D);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::QAR1(B)
        • P(c);::QAB1(B)
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • S(a);XB(D)
  • Actual
    • B(D);
    • Threat
      • QAR1(B)
    • Vars
      • K(b);P-FLIGHT,XB(D)::QAR1(B)
      • P(c);SBLOCK::QAR1(B)
      • P(c);SBLOCK::QAB1(B)
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