MESON Chess Problem Database

Problem Display
PID: 6208 (3Q2nn/3B2p1/8/4kp2/4b2N/p3bPP1/1r3NK1/B2RR3 w - - 0 1)

Lebedev, Aleksandr N

5th Prize, 64 Shakhmatnoe obozrenie, 1928

3Q2nn/3B2p1/8/4kp2/4b2N/p3bPP1/1r3NK1/B2RR3

#2

10 + 9

3098 FIDE Album (1914-1944) (I) 1971
56 The Problemist 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.f4#
    • 1...Bc2
      • 2.f4#
    • 1...Bxf3+
      • 2.Sxf3#
    • 1...Sf6
      • 2.Qc7#
      • 2.Qe7#
      • 2.Qb8#
    • 1...Sh6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sg6
      • 2.Sxg6#
    • 1...Sf7
      • 2.Sg6#
  • Tries
    • 1.Qe8+?
      • 1...Se7
        • 2.Qxe7#
      • 1...Kf6!
  • Keys
    • 1.Bc8!
      • threat
        • 2.Qd6#
      • 1...Bxf3+
        • 2.Sxf3#
      • 1...Bd2
        • 2.Sd3#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bc5
        • 2.Rd5#
      • 1...Bd3
        • 2.f4#
      • 1...Bd5
        • 2.Rxd5#
      • 1...Sf7
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • B(d);N_PINP(F),P_SPINB(c)::P(F)
    • B(d);N_PINP(F),N_PINS(D),P_SPINB(c)::P(F)
    • B(d);CHECK,P_SPINB(c),XP(F)::S(H),XB(d)
    • S(h);N_GUARD::QAR2(J)
    • S(h);N_GUARD::QAR2(J),XS(h)
    • S(i);N_GUARD::S(H),XS(i)
    • S(i);N_GUARD::S(H)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAR2(J),XS(h)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • B(I);
    • Threat
      • QAB1(J)
    • Vars
      • B(d);CHECK,P_SPINB(c),XP(F)::S(H),XB(d)
      • B(c);N_PINS(D),P_SPINB(d)::S(D)
      • B(c);N_GUARD,N_SPINR(a),P_SPINB(d)::QAB1(J),XB(c)
      • B(c);P_SPINB(d)::R1(B)
      • B(d);N_PINP(F),P_SPINB(c)::P(F)
      • B(d);N_GUARD,P_SPINB(c)::R1(B),XB(d)
      • S(i);N_GUARD::S(H)
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