MESON Chess Problem Database

Problem Display
PID: 157367 (6K1/1B6/1B1p4/4pk2/1N4pQ/6p1/6P1/8 w - - 0 1)

Lukashev, Viktor Sergeevich

Best Problems, 2008

6K1/1B6/1B1p4/4pk2/1N4pQ/6p1/6P1/8

#2

6 + 5

5454 Near Snap 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qf6#
    • 1...Ke6
      • 2.Bc8#
    • 1...Kg6
      • 2.Be4#
  • Tries
    • 1.Kf7?
      • threat
        • 2.Qf6#
      • 1...Kf4
        • 2.Qf6#
      • 1...d5!
    • 1.Kg7?
      • threat
        • 2.Qf6#
      • 1...Kf4
        • 2.Qf6#
      • 1...Ke6
        • 2.Bc8#
      • 1...d5!
    • 1.Bd8?
      • threat
        • 2.Qf6#
      • 1...Kf4
        • 2.Qg5#
      • 1...Ke6
        • 2.Bc8#
        • 2.Qxg4#
      • 1...Kg6
        • 2.Be4#
        • 2.Qg5#
        • 2.Qh7#
      • 1...d5!
    • 1.Bd5?
      • 1...Kf4
        • 2.Qf6#
      • 1...Kg6
        • 2.Be4#
      • 1...e4!
    • 1.Bc8+?
      • 1...Ke4
        • 2.Qxg4#
      • 1...Kf4
        • 2.Qxg4#
      • 1...Kg6!
    • 1.Qg5+?
      • 1...Ke6
        • 2.Bc8#
      • 1...Kxg5!
    • 1.Qxg4+?
      • 1...Kf6
        • 2.Sd5#
        • 2.Bd8#
      • 1...Kxg4!
    • 1.Qh5+?
      • 1...Kf4
        • 2.Sd3#
      • 1...Ke6
        • 2.Qf7#
      • 1...Kf6!
  • Keys
    • 1.Sd5!
      • 1...Ke4
        • 2.Qh7#
      • 1...Ke6
        • 2.Qxg4#
      • 1...Kg6
        • 2.Se7#
      • 1...e4
        • 2.Qf6#

Anticipated by 104465(1974), 177804(1985)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(d);P-FLIGHT,P_SPINP(b)::QAR2(C)
    • K(d);S_FLIGHT::B(E)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAR1(C)
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAR2(C)
      • Refutation
        • P(e);
    • Try
      • K(F);P-FLIGHT
      • Threat
        • QAR1(C)
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAR2(C)
        • K(d);S_FLIGHT::B(E)
      • Refutation
        • P(e);
    • Try
      • B(D);
      • Threat
        • QAR1(C)
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAB1(C)
      • Refutation
        • P(e);
    • Try
      • B(E);
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAR2(C)
        • K(d);S_FLIGHT::B(E)
      • Refutation
        • P(c);
    • Try
      • B(E);CHECK
      • Vars
        • K(d);P_SPINP(b),S_FLIGHT::QAR2(C),XP(b)
        • K(d);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT::B(E)
      • Refutation
        • K(d);P-FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,XP(b)
      • Refutation
        • K(d);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P-FLIGHT::S(B)
        • K(d);S_FLIGHT::QAB1(C)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • S(B);
    • Vars
      • K(d);P_SPINP(b),S_FLIGHT::QAB(C)
      • K(d);S_FLIGHT::QAB(C),XP(b)
      • K(d);S_FLIGHT::S(B)
      • P(c);SBLOCK::QAR1(C)
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