MESON Chess Problem Database

Problem Display
PID: 250761 (7Q/pp6/k7/8/1K6/8/8/8 w - - 0 1)

Zimmer, Eligiusz

Schweizerische Schachzeitung, 1999

7Q/pp6/k7/8/1K6/8/8/8

#2

2 + 3

5454 Near Snap 2021
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...b6
      • 2.Qc8#
  • Tries
    • 1.Qc3?
      • 1...b5
        • 2.Qc6#
      • 1...b6
        • 2.Qc8#
      • 1...Kb6!
    • 1.Qe5?
      • threat
        • 2.Qa5#
        • 2.Qb5#
      • 1...Kb6
        • 2.Qd6#
      • 1...b5
        • 2.Qxb5#
      • 1...b6!
    • 1.Qa8?
      • 1...b6
        • 2.Qc8#
      • 1...b5
        • 2.Qc6#
      • 1...Kb6!
    • 1.Qd8?
      • threat
        • 2.Qa5#
      • 1...b6
        • 2.Qc8#
      • 1...b5!
    • 1.Qe8?
      • threat
        • 2.Qb5#
      • 1...b5
        • 2.Qxb5#
        • 2.Qc6#
      • 1...b6
        • 2.Qc8#
      • 1...Kb6!
    • 1.Qf8?
      • 1...Kb6
        • 2.Qd6#
      • 1...b6
        • 2.Qc8#
      • 1...b5!
  • Keys
    • 1.Qb8!
      • 1...Kb6
        • 2.Qd6#
      • 1...b6
        • 2.Qc8#
      • 1...b5
        • 2.Qxb5#

Anticipated by 227818(1926), 86898(1975), 247167(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,SBLOCK::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • P(c);N_GUARD::QAR2(B)
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,S_CUTP(c)::QAR2(B)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(B);P_PINP(b)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(B)
        • P(c);OGATE::QAR2(B)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT,S_CUTP(c)::QAR2(B)
        • P(c);OGATEB,SBLOCK::QAB(B)
      • Refutation
        • P(c);
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT,P_SPINP(c)::QAR2(B)
      • P(c);OGATEB,SBLOCK::QAB(B)
      • P(c);OGATE::QAB1(B),XP(c)
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