MESON Chess Problem Database

Problem Display
PID: 163372 (4k1b1/3p1nK1/8/8/7B/8/8/3Q4 w - - 0 1)

Parkhomenko, Nikolai A

Uralski Problemist, 1994

4k1b1/3p1nK1/8/8/7B/8/8/3Q4

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qa4#
    • 1...d6
      • 2.Qa4#
  • Tries
    • 1.Qb3?
      • 1...d5
        • 2.Qa4#
        • 2.Qb5#
      • 1...d6
        • 2.Qa4#
        • 2.Qe6#
        • 2.Qb5#
      • 1...Bh7
        • 2.Qxf7#
      • 1...Se5
        • 2.Qxg8#
        • 2.Qb8#
      • 1...Sd6
        • 2.Qxg8#
      • 1...Sh6
        • 2.Qb8#
      • 1...Sd8
        • 2.Qxg8#
      • 1...Sh8
        • 2.Qxg8#
        • 2.Qb8#
      • 1...Sg5!
    • 1.Qf3?
      • 1...Sg5
        • 2.Qf8#
      • 1...d6
        • 2.Qc6#
      • 1...Bh7
        • 2.Qxf7#
      • 1...Se5
        • 2.Qa8#
        • 2.Qf8#
      • 1...Sd6
        • 2.Qf8#
      • 1...Sh6
        • 2.Qa8#
        • 2.Qf8#
      • 1...Sd8
        • 2.Qf8#
      • 1...Sh8
        • 2.Qa8#
        • 2.Qf8#
      • 1...d5!
    • 1.Qh5?
      • 1...d6
        • 2.Qb5#
      • 1...Bh7
        • 2.Qxf7#
      • 1...d5!
    • 1.Qd5?
      • 1...d6
        • 2.Qc6#
        • 2.Qe6#
        • 2.Qb5#
      • 1...Bh7
        • 2.Qxf7#
      • 1...Se5
        • 2.Qa8#
        • 2.Qxg8#
      • 1...Sd6
        • 2.Qxg8#
      • 1...Sh6
        • 2.Qa8#
      • 1...Sd8
        • 2.Qxg8#
      • 1...Sh8
        • 2.Qa8#
        • 2.Qxg8#
      • 1...Sg5!
    • 1.Qd6?
      • threat
        • 2.Qe7#
        • 2.Qf8#
      • 1...Sg5
        • 2.Qf8#
      • 1...Sxd6!
  • Keys
    • 1.Qf1!
      • 1...Sg5
        • 2.Qf8#
      • 1...d5
        • 2.Qb5#
      • 1...d6
        • 2.Qb5#
      • 1...Bh7
        • 2.Qxf7#
      • 1...Se5
        • 2.Qf8#
      • 1...Sd6
        • 2.Qf8#
      • 1...Sh6
        • 2.Qf8#
      • 1...Sd8
        • 2.Qf8#
      • 1...Sh8
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Vars
        • B(d);N_GUARD::QAB1(A),XS(b)
        • S(b);OGATE::QAR2(A),XB(d)
        • S(b);N_GUARD::QAR(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Vars
        • S(b);OGATE::QAR1(A)
        • P(a);OGATEB::QAB(A)
        • B(d);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • P(a);
    • Try
      • Q(A);P_PINS(b)
      • Vars
        • P(a);OGATEB::QAB(A)
        • B(d);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • B(d);N_GUARD::QAB1(A),XS(b)
        • S(b);OGATE::QAR2(A),XB(d)
        • S(b);N_GUARD::QAR(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::QAR1(A)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • S(b);OGATE::QAR1(A)
      • P(a);OGATEB::QAB(A)
      • B(d);N_GUARD::QAB1(A),XS(b)
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