MESON Chess Problem Database

Problem Display
PID: 137441 (3Q2K1/1p4pP/1Nqpk3/4B1P1/4BP1n/b2P4/8/4R3 w - - 0 1)

Lyubashevsky, Leonid Abramovic

Problemista, 1972

3Q2K1/1p4pP/1Nqpk3/4B1P1/4BP1n/b2P4/8/4R3

#2

10 + 7

6490 yacpdb 0000

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qd7#
    • 1...Qd5
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qd7
      • 2.Qxd7#
    • 1...Qe8+
      • 2.Qxe8#
    • 1...Qc1
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qc2
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qc3
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qc4
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qc5
      • 2.Qd7#
      • 2.Qe8#
    • 1...Qxb6
      • 2.Qe8#
    • 1...g6
      • 2.Qf6#
  • Tries
    • 1.Bd5+?
      • 1...Qxd5
        • 2.Qd7#
      • 1...Kf5!
    • 1.Bxc6?
      • threat
        • 2.Bd7#
        • 2.Qd7#
      • 1...dxe5
        • 2.Rxe5#
        • 2.Qd7#
      • 1...bxc6
        • 2.Qd7#
      • 1...Kf5!
    • 1.Bxg7?
      • threat
        • 2.Qf6#
      • 1...Qe8+
        • 2.Qxe8#
      • 1...Qxb6
        • 2.Qe8#
      • 1...Qc3
        • 2.Qd7#
        • 2.Qe8#
      • 1...Qc8
        • 2.Bg6#
      • 1...Bb2!
    • 1.Qf8?
      • threat
        • 2.Qf7#
      • 1...Qd7
        • 2.Bd5#
      • 1...Qe8
        • 2.Bd5#
        • 2.Qxe8#
      • 1...Qc7
        • 2.Bd5#
      • 1...Qc8
        • 2.Bd5#
      • 1...dxe5!
  • Keys
    • 1.Bf6!
      • threat
        • 2.Qe7#
      • 1...Qe8+
        • 2.Qxe8#
      • 1...Qxe4
        • 2.Qd7#
        • 2.Qc8#
      • 1...gxf6
        • 2.Qxf6#
      • 1...Qd7
        • 2.Bg6#
        • 2.Qxd7#
      • 1...Qc7
        • 2.Bg6#
      • 1...Qc8
        • 2.Bg6#
        • 2.Qxc8#
      • 1...Sf5
        • 2.Bd5#
      • 1...Sg6
        • 2.f5#
      • 1...d5
        • 2.Bg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD,XB(C)::QAB1(I)
    • Q(c);N_GUARD::QAB1(I),XQ(c)
    • Q(c);CHECK,N_GUARD::QAR2(I),XQ(c)
    • Q(c);N_GUARD,XS(G)::QAR2(I)
    • P(g);N_GUARD::QAR1(I)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • Q(c);XB(C)::QAB1(I)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(C);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);XB(C)::QAB1(I)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(E);XP(g)
      • Threat
        • QAR1(I)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR2(I),XQ(c)
        • Q(c);N_GUARD,XS(G)::QAR2(I)
        • Q(c);N_GUARD,P_PINQ(I)::R(A)+B(C)
      • Refutation
        • B(a);
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • Q(c);N_GUARD::B(C)
        • Q(c);N_GUARD,P_PINQ(I)::B(C)
      • Refutation
        • P(d);XB(E)
  • Actual
    • B(E);
    • Threat
      • QAR1(I)
    • Vars
      • Q(c);CHECK,N_GUARD::QAR2(I),XQ(c)
      • P(g);OGATE,XB(E)::QAR1(I),XP(g)
      • Q(c);N_GUARD::R(A)+B(C)
      • S(b);SBLOCK::R(A)+B(C),DCHECK
      • S(b);N_GUARD::P(D)
      • P(d);S_CUTQ(c)::R(A)+B(C)
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