MESON Chess Problem Database

Problem Display
PID: 47582 (8/2p1Q3/5p1b/4nP2/2bp4/2n1kPP1/2R2N1N/4B2K w - - 0 1)

Postnikov, Oleksandr Borisovich

1st Prize, 64 Shakhmatnoe obozrenie, 1991

8/2p1Q3/5p1b/4nP2/2bp4/2n1kPP1/2R2N1N/4B2K

#2

9 + 8

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.Sfg4#
    • 1...d3
      • 2.Qc5#
  • Tries
    • 1.Kg2?
      • threat
        • 2.Shg4#
      • 1...Bf1+
        • 2.Sxf1#
      • 1...d3
        • 2.Qc5#
      • 1...Be6
        • 2.Sf1#
      • 1...Se4!
    • 1.Rd2?
      • threat
        • 2.Sfg4#
      • 1...d3
        • 2.Qc5#
      • 1...Se4
        • 2.Sd1#
      • 1...Be6!
    • 1.Qxe5+?
      • 1...Se4
        • 2.Qxe4#
      • 1...fxe5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qc1#
      • 1...Sxf3
        • 2.Shg4#
      • 1...d3
        • 2.Qc5#
      • 1...Sd3
        • 2.Sfg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(c);SBLOCK::S(D)
    • P(d);OGATEB::QAB(I)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • S(E)
      • Vars
        • B(c);CHECK,N_GUARD::S(E),XB(c)
        • P(d);OGATEB::QAB(I)
        • B(c);N_GUARD,N_SPINS(e)::S(E)
      • Refutation
        • S(a);N_SPINS(e)
    • Try
      • R(C);
      • Threat
        • S(D)
      • Vars
        • P(d);OGATEB::QAB(I)
        • S(a);N_GUARD,N_SPINS(e)::S(D)
      • Refutation
        • B(c);N_SPINS(e)
    • Try
      • Q(I);CHECK,XS(e)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(I),XS(a)
      • Refutation
        • P(f);XQ(I)
  • Actual
    • Q(I);N_PINS(e),P_PINS(a)
    • Threat
      • QAB(I)
    • Vars
      • S(e);N_GUARD,SBLOCK,XP(F)::S(E)
      • P(d);N_SPINS(a),OGATEB::QAB(I)
      • S(e);N_GUARD,N_SPINS(a),SBLOCK::S(D)
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