MESON Chess Problem Database

Problem Display
PID: 246644 (8/7B/8/8/8/3N1Q2/1p5K/k7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Magadanskaya Pravda, 1998

8/7B/8/8/8/3N1Q2/1p5K/k7

#2

4 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...b1R
      • 2.Qa8#
  • Tries
    • 1.Qg2?
      • threat
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#
      • 1...b1S
        • 2.Qb2#
      • 1...b1B
        • 2.Qb2#
      • 1...b1R
        • 2.Qa8#
      • 1...b1Q!
    • 1.Qb7?
      • threat
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#
      • 1...b1S
        • 2.Qb2#
      • 1...b1B
        • 2.Qb2#
      • 1...b1R
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qa7#
      • 1...b1Q!
    • 1.Qf2?
      • threat
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#
      • 1...b1S
        • 2.Qb2#
      • 1...b1B
        • 2.Qb2#
      • 1...b1R
        • 2.Qa7#
      • 1...b1Q!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);SBLOCK::QAB(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(C),XP(b)
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
        • P(b);::QAB1(C)
        • P(b);SBLOCK::QAB(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
        • K(a);P-FLIGHT::QAR1(C),XP(b)
        • P(b);::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(C),XP(b)
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
        • P(b);::QAB1(C)
        • P(b);SBLOCK::QAR(C)
      • Refutation
        • P(b);
  • Actual
    • Q(C);P_PINP(b)
    • Threat
      • QAB1(C),XP(b)
    • Vars
      • K(a);N_SPINP(b),P-FLIGHT::QAR1(C),XP(b)
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