MESON Chess Problem Database

Problem Display
PID: 136983 (b3K3/r2PQ3/r1P3pn/bk3NR1/5pq1/6p1/1P2NB2/2R2Bn1 w - - 0 1)

Barulin, Mikhail Mikhailovich

3rd Prize, Byelorussky SPK, 1934

b3K3/r2PQ3/r1P3pn/bk3NR1/5pq1/6p1/1P2NB2/2R2Bn1

#2

11 + 11

133 The Problemist Supplement 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc6
      • 2.Sc3#
    • 1...Bxc6
      • 2.Sc3#
  • Tries
    • 1.Sxg1+?
      • 1...Ka4
        • 2.Qa3#
      • 1...Qe2!
    • 1.Sed4+?
      • 1...Ka4
        • 2.Bb5#
        • 2.Ra1#
        • 2.Qa3#
        • 2.b3#
      • 1...Kb6!
    • 1.Sfd4+?
      • 1...Ka4
        • 2.Ra1#
        • 2.Qa3#
        • 2.b3#
      • 1...Kb6!
  • Keys
    • 1.b3!
      • threat
        • 2.Qc5#
      • 1...Qxe2
        • 2.Sxh6#
      • 1...Qxf5
        • 2.Sxg1#
      • 1...Rxc6
        • 2.Sc3#
      • 1...Rb6
        • 2.Sed4#
      • 1...Bb4
        • 2.Sd6#
      • 1...Bb6
        • 2.Sfd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(g);SBLOCK,XP(H)::B(B)+S(D),DCHECK
    • B(k);P_PINP(I),SBLOCK,XP(H)::B(B)+S(D),DCHECK
  • Tries
    • Try
      • S(D);CHECK,XS(a)
      • Vars
        • K(f);S_FLIGHT::QAR1(J)
      • Refutation
        • Q(d);P_PINQ(J),P_SPINQ(d)
    • Try
      • S(D);CHECK
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • P(C);
    • Threat
      • QAR1(J)
    • Vars
      • Q(d);N_GUARD,P_PINQ(J),P_SPINQ(d),XS(D)::R(G)+S(F),XS(i)
      • Q(d);N_GUARD,P_SPINQ(d),XS(F)::B(B)+S(D),XS(a)
      • R(g);SBLOCK,XP(H)::B(B)+S(D),DCHECK
      • R(g);SBLOCK::B(B)+S(D),DCHECK
      • B(e);SBLOCK::R(G)+S(F),DCHECK
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