MESON Chess Problem Database

Problem Display
PID: 86859 (3Q4/3p1p2/4k2N/7K/2PP4/3P4/8/8 w - - 0 1)

Chernenko, Aleksandr

Pfeiffer MT, 1980

3Q4/3p1p2/4k2N/7K/2PP4/3P4/8/8

#2

6 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.cxd5#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Qf6#
      • 1...f6+
        • 2.Qxf6#
      • 1...d5
        • 2.cxd5#
      • 1...d6
        • 2.Qe8#
      • 1...Kd6!
    • 1.Qxd7+?
      • 1...Kf6
        • 2.Qxf7#
      • 1...Kxd7!
    • 1.Qe8+?
      • 1...Kf6
        • 2.Qxf7#
        • 2.Qe5#
      • 1...Kd6!
  • Keys
    • 1.Sg8!
      • threat
        • 2.Qf6#
      • 1...Kf5
        • 2.Qf6#
      • 1...Kd6
        • 2.Qb6#
      • 1...f6
        • 2.Qxf6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE::P(B),XP(b)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAR1(F)
      • Vars
        • P(c);CHECK::QAR1(F),XP(c)
        • P(b);OGATE::P(B),XP(b)
        • P(b);SBLOCK::QAR2(F)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • Q(F);CHECK,XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(F),XP(c)
      • Refutation
        • K(a);S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(E);
    • Threat
      • QAR1(F)
    • Vars
      • K(a);S_FLIGHT::QAR1(F)
      • K(a);P-FLIGHT,P_SPINP(b)::QAR2(F)
      • P(c);::QAR1(F),XP(c)
      • P(b);OGATE::QAB1(F),XP(b)
      • P(b);OGATEB,SBLOCK::QAB(F)
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