MESON Chess Problem Database

Problem Display
PID: 50924 (1q3N2/2B1P3/3n3b/1B2k2N/2R1P2K/1pppp1R1/Q7/5b2 w - - 0 1)

Mochalkin, Oleksandr Viktorovich

1/2 Prize, Birnov MT, 1990

1q3N2/2B1P3/3n3b/1B2k2N/2R1P2K/1pppp1R1/Q7/5b2

#2

10 + 9

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.e8Q#
      • 2.e8R#
    • 1...Qb6
      • 2.e8Q#
      • 2.e8R#
    • 1...Qb7
      • 2.e8Q#
      • 2.e8R#
    • 1...Bg5+
      • 2.Rxg5#
    • 1...Bg7
      • 2.Rg5#
    • 1...c2
      • 2.Qb2#
  • Tries
    • 1.Rg6?
      • threat
        • 2.Sd7#
        • 2.Re6#
      • 1...Bg5+
        • 2.Rxg5#
      • 1...Qxc7
        • 2.Re6#
      • 1...Qxb5
        • 2.Bxd6#
        • 2.Re6#
      • 1...Qxf8
        • 2.Bxd6#
      • 1...Bxf8
        • 2.Qh2#
      • 1...Qc8
        • 2.Bxd6#
      • 1...Qd8
        • 2.Re6#
      • 1...Qe8
        • 2.Bxd6#
        • 2.Re6#
      • 1...Bh3!
    • 1.Qh2?
      • threat
        • 2.Rg5#
      • 1...Bg5+
        • 2.Rxg5#
      • 1...Bxf8
        • 2.Rg6#
      • 1...Qxf8!
    • 1.Qa3?
      • threat
        • 2.Qc5#
        • 2.Qxd6#
      • 1...Bg5+
        • 2.Rxg5#
      • 1...Qxb5
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...Qxf8
        • 2.Qxd6#
      • 1...Bxf8
        • 2.Qxd6#
      • 1...Qa7
        • 2.Bxd6#
        • 2.Qxd6#
        • 2.e8Q#
        • 2.e8R#
      • 1...Qb6
        • 2.e8Q#
        • 2.e8R#
      • 1...Qb7
        • 2.Bxd6#
        • 2.Qxd6#
        • 2.e8Q#
        • 2.e8R#
      • 1...Qa8
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...Qd8
        • 2.Qc5#
      • 1...Qxc7!
    • 1.Qa5?
      • threat
        • 2.Qxc3#
      • 1...Bg5+
        • 2.Rxg5#
      • 1...Qxf8
        • 2.Bd7#
      • 1...Qa7
        • 2.e8Q#
        • 2.e8R#
      • 1...Qb6
        • 2.e8Q#
        • 2.e8R#
      • 1...c2
        • 2.Qc3#
      • 1...Bxf8!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Sg6#
      • 1...Bg5+
        • 2.Rxg5#
      • 1...Qxf8
        • 2.Qa5#
      • 1...Bxf8
        • 2.Rg5#
      • 1...Qe8
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_GUARD::P=Q
    • B(h);CHECK,N_GUARD::R(B),XB(h)
    • B(h);N_GUARD::R(B)
    • P(c);OGATEB::QAB(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(h);CHECK,N_GUARD::R(B),XB(h)
        • Q(i);N_SPINS(g),XB(H)::R1(B)
        • Q(i);N_GUARD,XS(J)::B(H),XS(g)
        • B(h);N_GUARD,XS(J)::QAB(A)
        • Q(i);N_GUARD::B(H),XS(g)
        • Q(i);P_PINP(I)::R1(B)
      • Refutation
        • B(a);
    • Try
      • Q(A);
      • Threat
        • QAB(A)+R(B),DCHECK
      • Vars
        • B(h);CHECK::QAB(A)+R(B),DCHECK,XB(h)
        • B(h);N_GUARD,XS(J)::QAB(A)+R(B)
      • Refutation
        • Q(i);XS(J)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(h);CHECK,N_GUARD::R(B),XB(h)
        • Q(i);XS(J)::QAB1(A),XS(g)
        • B(h);XS(J)::QAB1(A),XS(g)
        • Q(i);N_GUARD::P=Q
        • Q(i);P_PINP(I)::QAR2(A)
      • Refutation
        • Q(i);N_SPINS(g),XB(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(c)
      • Vars
        • B(h);CHECK,N_GUARD::R(B),XB(h)
        • Q(i);N_GUARD,XS(J)::QAR(A)+B(F)
        • Q(i);N_GUARD::P=Q
        • P(c);::QAB(A)
      • Refutation
        • B(h);XS(J)
  • Actual
    • B(F);
    • Threat
      • S(J)
    • Vars
      • B(h);CHECK,N_GUARD::R(B),XB(h)
      • Q(i);N_GUARD,XS(J)::QAR(A)
      • B(h);N_GUARD,XS(J)::R(B)
      • Q(i);N_GUARD::QAR(A)
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