MESON Chess Problem Database

Problem Display
PID: 86898 (5Q2/3pp1K1/4k3/4p3/4B3/8/8/8 w - - 0 1)

Parkhomenko, Nikolai A

Problemas, 1975

5Q2/3pp1K1/4k3/4p3/4B3/8/8/8

#2

3 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d6
      • 2.Qf5#
      • 2.Qc8#
  • Tries
    • 1.Qf2?
      • 1...Kd6
        • 2.Qb6#
      • 1...d6
        • 2.Qf5#
      • 1...d5!
    • 1.Qa8?
      • threat
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
        • 2.Qc6#
      • 1...d6
        • 2.Qc8#
      • 1...Kd6!
    • 1.Qb8?
      • 1...d6
        • 2.Qc8#
      • 1...d5!
    • 1.Qe8?
      • threat
        • 2.Qg6#
      • 1...d5
        • 2.Qc6#
      • 1...d6
        • 2.Qc8#
      • 1...Kd6!
  • Keys
    • 1.Qd8!
      • 1...Kd6
        • 2.Qb6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#

Anticipated by 227818(1926)

This anticipates 247167(1998), 250761(1999)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
        • P(c);SBLOCK::QAB1(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);P_PINP(d)
      • Threat
        • QAR2(C)
      • Vars
        • P(c);OGATE::QAR2(C)
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(b);N_SPINP(d),P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C)
      • P(c);OGATE::QAB1(C),XP(c)
      • P(c);OGATEB,SBLOCK::QAB(C)
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