MESON Chess Problem Database

Problem Display
PID: 6446 (1N1b4/6nr/R5n1/2Ppk2r/K2p2qR/8/2N1PQ2/B6B w - - 0 1)

Barulin, Mikhail Mikhailovich

1st Prize, Shakhmatny Listok, 1929

1N1b4/6nr/R5n1/2Ppk2r/K2p2qR/8/2N1PQ2/B6B

#2

10 + 9

35 L'Italia Scacchistica 1930
3098 FIDE Album (1914-1944) (I) 1971
56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Sd7#
      • 2.Bxd4#
    • 1...Qh3
      • 2.Bxd4#
    • 1...Qf5
      • 2.Bxd4#
      • 2.Qxd4#
    • 1...Qe6
      • 2.Bxd4#
    • 1...Qd7+
      • 2.Sxd7#
    • 1...Qc8
      • 2.Bxd4#
    • 1...Qg1
      • 2.Sd7#
      • 2.Bxd4#
    • 1...Qg2
      • 2.Sd7#
      • 2.Bxd4#
    • 1...Qg3
      • 2.Sd7#
      • 2.Bxd4#
    • 1...Qe4
      • 2.Sd7#
    • 1...Qxh4
      • 2.Sd7#
    • 1...Qg5
      • 2.Sd7#
      • 2.Bxd4#
    • 1...Rf5
      • 2.Sd7#
    • 1...Ba5
      • 2.Qf6#
    • 1...Bf6
      • 2.Qxf6#
    • 1...Bc7
      • 2.Qf6#
    • 1...Se7
      • 2.Qf6#
    • 1...Se6
      • 2.Sc6#
  • Tries
    • 1.Re6+?
      • 1...Qxe6
        • 2.Bxd4#
      • 1...Sxe6
        • 2.Sc6#
      • 1...Kxe6!
    • 1.Qxd4+?
      • 1...Kf5
        • 2.Qxg4#
      • 1...Qxd4+!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Sc6#
      • 1...Qd7+
        • 2.Sxd7#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Qf3
        • 2.Sd7#
      • 1...Qf5
        • 2.Sf3#
      • 1...Qe6
        • 2.Sdc6#
      • 1...Qc8
        • 2.Qe3#
      • 1...Qf4
        • 2.Sd7#
      • 1...Rf5
        • 2.Sd7#
      • 1...Sf4
        • 2.Qe3#
      • 1...Se7
        • 2.Qf6#
      • 1...Sf5
        • 2.Re6#

There are these versions: 146385, 146386

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::B(A),XP(a)
    • Q(b);CHECK,N_GUARD::S(J),XQ(b)
    • Q(b);N_GUARD::S(J)
    • Q(b);N_GUARD,XR(G)::S(J)
    • R(e);S_CUTQ(b)::S(J)
    • B(i);N_GUARD::QAB1(E)
    • B(i);N_GUARD::QAB1(E),XB(i)
    • S(f);S_CUTB(i)::QAB1(E)
    • S(g);SBLOCK::S(J)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • Q(b);SBLOCK,XR(I)::B(A),XP(a)
        • S(g);SBLOCK,XR(I)::S(J)
      • Refutation
        • K(d);N_SPINP(a),P-FLIGHT,XR(I)
    • Try
      • Q(E);CHECK,P_SPINQ(E),XP(a)
      • Vars
        • K(d);P-FLIGHT::QAB1(E),XQ(b)
      • Refutation
        • Q(b);CHECK,P_SPINQ(b),XQ(E)
  • Actual
    • S(C);P_SPINS(C),XP(a)
    • Threat
      • S(J)
    • Vars
      • Q(b);CHECK,N_GUARD,N_PINS(C)::S(J),XQ(b)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
      • Q(b);N_GUARD,N_PINS(C)::S(J)
      • Q(b);N_PINS(C),SBLOCK::B(A)+S(C),DCHECK
      • Q(b);N_GUARD,N_PINS(C)::QAR2(E)
      • Q(b);N_GUARD::S(J)
      • R(e);S_CUTQ(b)::S(J)
      • S(f);N_PINS(C),S_CUTQ(b)::QAR2(E)
      • S(f);S_CUTB(i)::QAB1(E)
      • S(g);N_GUARD,S_CUTQ(b)::R1(I)
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