MESON Chess Problem Database

Problem Display
PID: 225587 (1K5Q/1bB3p1/4P3/pR4p1/N3k1pn/1R6/2Np1np1/3rr2q w - - 0 1)

Lebedev, Alexey Viktorovich

Praca, 1995

1K5Q/1bB3p1/4P3/pR4p1/N3k1pn/1R6/2Np1np1/3rr2q

#2

8 + 13

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Re3#
    • 1...Rg1
      • 2.Re3#
    • 1...Re3
      • 2.Rxe3#
    • 1...g6
      • 2.Qd4#
      • 2.Qe5#
  • Tries
    • 1.Qxg7?
      • threat
        • 2.Qd4#
        • 2.Qe5#
      • 1...Re3
        • 2.Rxe3#
      • 1...Bd5
        • 2.Qe5#
      • 1...Qh2
        • 2.Qd4#
      • 1...Sf3
        • 2.Qg6#
      • 1...Sf5
        • 2.Qe5#
      • 1...Sg6
        • 2.Qd4#
        • 2.Qxg6#
      • 1...Sd3!
    • 1.Qh7+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg6
        • 2.Qxg6#
      • 1...g6!
    • 1.Qf8?
      • threat
        • 2.Re5#
      • 1...Bd5
        • 2.Sc5#
      • 1...Sd3
        • 2.Sc3#
      • 1...Sf3
        • 2.Qf5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg6
        • 2.Qf5#
      • 1...Qh2!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qd4#
      • 1...Re3
        • 2.Rxe3#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sf3
        • 2.Sc3#
      • 1...Sf5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::R1(B)
    • R(b);N_GUARD::R1(B),XR(b)
  • Tries
    • Try
      • Q(H);XP(m)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_GUARD::R1(B),XR(b)
        • B(l);::QAR1(H)
        • Q(c);P_PINB(F)::QAR1(H)
        • S(i);N_GUARD::QAB(H)
        • S(i);::QAR1(H)
      • Refutation
        • S(e);
    • Try
      • Q(H);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAB1(H),XS(i)
        • S(i);N_GUARD,P_SPINS(i)::QAB(H),XS(i)
      • Refutation
        • P(m);P_SPINP(m)
    • Try
      • Q(H);
      • Threat
        • R1(D)
      • Vars
        • B(l);SBLOCK::S(C)
        • S(e);SBLOCK::S(C)
        • S(i);N_GUARD::QAB1(H)
        • S(i);N_GUARD::QAB1(H),XS(i)
      • Refutation
        • Q(c);P_PINB(F)
  • Actual
    • Q(H);
    • Threat
      • QAR1(H)
    • Vars
      • R(b);N_GUARD::R1(B),XR(b)
      • B(l);N_GUARD::QAB1(H),XB(l)
      • S(e);N_GUARD::QAB1(H),XS(e)
      • S(i);SBLOCK::S(C)
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