MESON Chess Problem Database

Problem Display
PID: 18231 (1K6/1R1p4/2k5/4Q3/8/8/p7/7b w - - 0 1)

Hermanson, Halvar

Norsk Vanforetidsskrift, 1954

1K6/1R1p4/2k5/4Q3/8/8/p7/7b

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Qc7#
    • 1...d5
      • 2.Qc7#
    • 1...d6
      • 2.Qb5#
  • Tries
    • 1.Rb5?
      • threat
        • 2.Qc5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...d6
        • 2.Qe8#
      • 1...d5!
    • 1.Qa5?
      • threat
        • 2.Rb6#
      • 1...d5
        • 2.Qb6#
        • 2.Qc7#
      • 1...d6
        • 2.Rc7#
        • 2.Qb5#
      • 1...Kd6!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Rb6#
      • 1...d5
        • 2.Qb6#
      • 1...d6
        • 2.Qc4#

This anticipates 18862(1958), 71066(1975)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::QAR1(A)
    • P(d);SBLOCK::QAR1(A)
    • P(d);SBLOCK::QAB1(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);N_GUARD::QAB1(A),XB(a)
        • P(d);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);
      • Threat
        • R1(B)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • R1(B)
    • Vars
      • P(d);SBLOCK::QAR1(A)
      • P(d);SBLOCK::QAR2(A)
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