MESON Chess Problem Database

Problem Display
PID: 147691 (4Q1b1/b2pN3/5R2/2p2PK1/4k1N1/p2pBp2/q4r2/1B2R3 w - - 0 1)

Lebedev, Aleksandr N

64 Shakhmatnoe obozrenie, 1929

4Q1b1/b2pN3/5R2/2p2PK1/4k1N1/p2pBp2/q4r2/1B2R3

#2

9 + 10

35 L'Italia Scacchistica 1930

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Bxf2#
    • 1...Qc4
      • 2.Bxf2#
    • 1...Qd5
      • 2.Bxf2#
    • 1...Qe6
      • 2.Bxf2#
    • 1...Qf7
      • 2.Bxf2#
    • 1...Qa1
      • 2.Bxf2#
    • 1...d5
      • 2.Sxg8#
  • Tries
    • 1.Sxf2+?
      • 1...Qxf2
        • 2.Bxf2#
      • 1...Ke5!
    • 1.Sd5+?
      • 1...Be6
        • 2.Sc3#
      • 1...Kxd5!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Bxd3#
      • 1...Qxb1
        • 2.Sxg8#
      • 1...Qe2
        • 2.Sxg8#
      • 1...Qb3
        • 2.Bxf2#
      • 1...Qc4
        • 2.Bxf2#
      • 1...Qd5
        • 2.Bxf2#
      • 1...Qc2
        • 2.Sxg8#
      • 1...Qd2
        • 2.Sxg8#
      • 1...Rc2
        • 2.Bd2#
      • 1...Rd2
        • 2.Bxd2#
      • 1...Bc4
        • 2.Sd5#
      • 1...Bd5
        • 2.Sxd5#
      • 1...c4
        • 2.Sxg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_GUARD::R(B)+B(C),XR(b)
    • Q(a);N_GUARD,P_PINP(E)::R(B)+B(C),XR(b)
    • P(i);SBLOCK,S_CUTQ(a)::QAR(I)+S(H),XB(j)
  • Tries
    • Try
      • S(D);CHECK,XR(b)
      • Vars
        • Q(a);OGATE,XS(D)::R(B)+B(C),XQ(a)
      • Refutation
        • K(f);N_SPINP(d),P-FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • B(j);P_SPINB(j)::S(H)
      • Refutation
        • K(f);N_SPINP(d),S_FLIGHT,XS(H)
  • Actual
    • R(G);
    • Threat
      • B(A),XP(d)
    • Vars
      • Q(a);N_GUARD,N_SPINP(d),XB(A)::QAR(I)+S(H),XB(j)
      • Q(a);N_GUARD::QAR(I)+S(H),XB(j)
      • Q(a);N_GUARD::R(B)+B(C),XR(b)
      • Q(a);N_GUARD,P_PINP(E)::R(B)+B(C),XR(b)
      • Q(a);N_GUARD,N_SPINP(d)::QAR(I)+S(H),XB(j)
      • Q(a);N_GUARD,P_PINB(C)::QAR(I)+S(H),XB(j)
      • R(b);N_GUARD,N_SPINP(d)::R(B)+B(C)
      • R(b);N_GUARD::R(B)+B(C),XR(b)
      • B(j);N_GUARD::QAR(I)+S(H)
      • B(j);N_GUARD::QAR(I)+S(H),XB(j)
      • P(g);S_CUTQ(a)::QAR(I)+S(H),XB(j)
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