MESON Chess Problem Database

Problem Display
PID: 79546 (1b2K3/3p4/4k3/2Q5/6P1/8/1B6/8 w - - 0 1)

Davidenko, Fedor Vasilevich

Sachove umeni (Ceskoslovensky sach), 1977

1b2K3/3p4/4k3/2Q5/6P1/8/1B6/8

#2

4 + 3

5454 Near Snap 2010
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qxe5#
    • 1...Bd6
      • 2.Qc4#
      • 2.Qf5#
    • 1...Ba7
      • 2.Qe5#
    • 1...d5
      • 2.Qe7#
    • 1...d6
      • 2.Qf5#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qxd7#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bd6
        • 2.Qc4#
        • 2.Qb3#
        • 2.Qf5#
      • 1...d5
        • 2.Qd7#
      • 1...d6
        • 2.Qf5#
      • 1...Kd6!
    • 1.Qc6+?
      • 1...Bd6
        • 2.Qc4#
      • 1...d6
        • 2.Qe4#
      • 1...dxc6!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qxd7#
      • 1...Be5
        • 2.Qxe5#
      • 1...d5
        • 2.Qf6#
      • 1...Bd6
        • 2.Qc4#
      • 1...d6
        • 2.Qe4#

Anticipated by 21170(1917)

This anticipates 266203(1978)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::QAR1(C),XB(c)
    • B(c);N_GUARD::QAR1(C)
    • P(b);SBLOCK::QAR1(C)
    • P(b);SBLOCK::QAB1(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • B(c);N_GUARD::QAR1(C),XB(c)
        • P(b);::QAB1(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • B(c);P_SPINB(c),SBLOCK,S_CUTP(b)::QAB(C)
        • P(b);P_SPINP(b),SBLOCK,S_CUTB(c)::QAR2(C)
      • Refutation
        • P(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XP(b)
    • Vars
      • B(c);N_GUARD::QAR1(C),XB(c)
      • P(b);SBLOCK::QAR1(C)
      • B(c);SBLOCK,S_CUTP(b)::QAB(C)
      • P(b);SBLOCK,S_CUTB(c)::QAR2(C)
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