MESON Chess Problem Database

Problem Display
PID: 238024 (5NKn/q2pB3/2PPn1Bb/1r2k2r/2P3P1/1p5p/4N3/4Q3 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Shakhmaty v SSSR, 1977

5NKn/q2pB3/2PPn1Bb/1r2k2r/2P3P1/1p5p/4N3/4Q3

#2

10 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Sxd7#
    • 1...Qf2
      • 2.Sxd7#
    • 1...Qe3
      • 2.Sxd7#
    • 1...Qd4
      • 2.Sxd7#
    • 1...Qc5
      • 2.Sxd7#
    • 1...Qb6
      • 2.Sxd7#
    • 1...Qa1
      • 2.Sxd7#
    • 1...Qa2
      • 2.Sxd7#
    • 1...Qa3
      • 2.Sxd7#
    • 1...Qa4
      • 2.Sxd7#
    • 1...Qa5
      • 2.Sxd7#
    • 1...Qa6
      • 2.Sxd7#
    • 1...Sc5
      • 2.Qc3#
    • 1...Sg5
      • 2.Qg3#
  • Tries
    • 1.Qc3+?
      • 1...Qd4
        • 2.Sxd7#
      • 1...Sd4!
    • 1.Qh1?
      • threat
        • 2.Qe4#
      • 1...Sxg6
        • 2.Sxg6#
      • 1...Qe3
        • 2.Sxd7#
      • 1...Qd4
        • 2.Sxd7#
      • 1...Sc5
        • 2.Qd5#
      • 1...Sg5
        • 2.Qh2#
      • 1...Rf5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qe4#
      • 1...Sxg6
        • 2.Sxg6#
      • 1...Qe3
        • 2.Sxd7#
      • 1...Qd4
        • 2.Sxd7#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Sc5
        • 2.Qb2#
      • 1...Sg5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(h);N_GUARD::S(I),XP(i)
    • S(f);N_GUARD,S_CUTQ(h)::QAB(A)
    • S(f);N_GUARD,S_CUTB(g)::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(h);P_SPINQ(h)::S(I),XP(i)
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(j);XB(G)::S(I),XS(j)
        • Q(h);N_GUARD::S(I),XP(i)
        • S(f);S_CUTR(c)::QAR1(A)
        • S(f);N_GUARD,S_CUTB(g)::QAB(A)
      • Refutation
        • R(e);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • S(j);XB(G)::S(I),XS(j)
      • Q(h);N_GUARD::S(I),XP(i)
      • R(e);N_GUARD::QAR1(A),XR(e)
      • S(f);N_GUARD,S_CUTQ(h)::QAB(A)
      • S(f);S_CUTR(e)::QAR1(A)
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