MESON Chess Problem Database

Problem Display
PID: 87156 (R3n3/4k3/4P3/4Q3/1K6/7B/8/8 w - - 0 1)

Kovalenko, Vitaly Semenovich

Amirov MT, 1998

R3n3/4k3/4P3/4Q3/1K6/7B/8/8

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Qg5#
    • 1...Sf6
      • 2.Qc5#
  • Tries
    • 1.Kc5?
      • 1...Sc7
        • 2.Qg7#
        • 2.Qg5#
      • 1...Sd6
        • 2.Qg5#
      • 1...Sf6
        • 2.Qd6#
      • 1...Sg7
        • 2.Qxg7#
        • 2.Qg5#
      • 1...Kf8!
    • 1.Ra7+?
      • 1...Kd8
        • 2.Qb8#
        • 2.e7#
      • 1...Kf8
        • 2.Qh8#
      • 1...Sc7!
    • 1.Rd8?
      • 1...Kxd8
        • 2.e7#
      • 1...Sc7
        • 2.Qg5#
      • 1...Sd6
        • 2.Qg5#
      • 1...Sf6
        • 2.Qd6#
      • 1...Sg7
        • 2.Qg5#
      • 1...Kf8!
    • 1.Qd4?
      • 1...Sc7
        • 2.Qd8#
      • 1...Sd6
        • 2.Qh4#
      • 1...Sf6
        • 2.Qc5#
        • 2.Qd8#
      • 1...Sg7
        • 2.Qd8#
      • 1...Kf8!
    • 1.Qf4?
      • 1...Sc7
        • 2.Qf8#
      • 1...Sd6
        • 2.Qg5#
        • 2.Qh4#
        • 2.Qf8#
      • 1...Sg7
        • 2.Qf8#
      • 1...Sf6!
    • 1.Qh8?
      • 1...Sg7
        • 2.Qd8#
        • 2.Qf8#
      • 1...Sc7
        • 2.Qd8#
        • 2.Qf8#
      • 1...Sd6
        • 2.Qh4#
        • 2.Qd8#
        • 2.Qf8#
      • 1...Sf6
        • 2.Qd8#
        • 2.Qf8#
      • 1...Kd6!
    • 1.Qc5+?
      • 1...Sd6
        • 2.Qg5#
      • 1...Kf6!
    • 1.Qg5+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Sf6
        • 2.Qc5#
      • 1...Kf8!
  • Keys
    • 1.Qf5!
      • 1...Kd6
        • 2.Qc5#
      • 1...Sc7
        • 2.Qf8#
      • 1...Sd6
        • 2.Qg5#
        • 2.Qf8#
      • 1...Sf6
        • 2.Qc5#
      • 1...Sg7
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD,SBLOCK::QAB(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(b);N_GUARD::QAB(C)
        • S(b);N_GUARD,SBLOCK::QAB1(C)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • R(E);
      • Vars
        • K(a);OGATE,S_FLIGHT,XR(E)::P(D)
        • S(b);N_GUARD::QAB(C)
        • S(b);N_GUARD,SBLOCK::QAB1(C)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(b);::QAB1(C)
        • S(b);N_GUARD,SBLOCK::QAB(C)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(b);::QAB1(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b),SBLOCK::QAB(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
        • S(b);N_GUARD,P_SPINS(b),SBLOCK::QAB(C)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • S(b);::QAB1(C)
      • S(b);N_GUARD,SBLOCK::QAB(C)
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