MESON Chess Problem Database

Problem Display
PID: 86539 (1n3N2/B1k2K2/8/2PQ4/8/8/8/8 w - - 0 1)

Archakov, Vladimir Mikhailovich

Melnichenko, Viktor Oleksandrovich

Sahs Baltija, 1990

1n3N2/B1k2K2/8/2PQ4/8/8/8/8

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa6
      • 2.Qd7#
    • 1...Sc6
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
  • Tries
    • 1.Ke6?
      • 1...Sc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
    • 1.Kf6?
      • 1...Sd7+
        • 2.Qxd7#
      • 1...Sc6
        • 2.Qd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
    • 1.Kg6?
      • 1...Sc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
    • 1.Kg7?
      • 1...Sc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
    • 1.Ke8?
      • 1...Sc6
        • 2.Qd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Kc8!
    • 1.Kg8?
      • 1...Sc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
    • 1.Qe6?
      • 1...Kd8
        • 2.Bb6#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Sc6
        • 2.Qd7#
      • 1...Kb7!
    • 1.Qb7+?
      • 1...Kd8
        • 2.Se6#
        • 2.Bb6#
        • 2.Qxb8#
      • 1...Kxb7!
    • 1.Qd6+?
      • 1...Kc8
        • 2.Qxb8#
      • 1...Kb7!
    • 1.c6?
      • 1...Sxc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa6
        • 2.Qd7#
      • 1...Kc8!
  • Keys
    • 1.Qa8!
      • 1...Kc8
        • 2.Qxb8#
      • 1...Kd8
        • 2.Qxb8#
      • 1...Sa6
        • 2.Bb6#
      • 1...Sc6
        • 2.Bb6#
      • 1...Sd7
        • 2.Se6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);S_FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);S_FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);S_FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::B(C)
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(A);
      • Vars
        • S(b);N_GUARD,XP(A)::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT,P_SPINS(b)::QAR1(B),XS(b)
      • K(a);P_SPINS(b),S_FLIGHT::QAR2(B),XS(b)
      • S(b);::B(C)
      • S(b);SBLOCK::S(E)
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