MESON Chess Problem Database

Problem Display
PID: 251306 (3Nb3/3n2pp/1R1N2kP/p5Pp/7P/1B6/K1Pq2R1/BQ3nr1 w - - 0 1)

Lebedev, Aleksandr N

British Chess Magazine, 1933

3Nb3/3n2pp/1R1N2kP/p5Pp/7P/1B6/K1Pq2R1/BQ3nr1

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.c4#
    • 1...Qxc2+
      • 2.Bxc2#
      • 2.Qxc2#
    • 1...Qxd6
      • 2.c3#
      • 2.c4#
    • 1...Bf7
      • 2.Bxf7#
  • Tries
    • 1.Sf5+?
      • 1...Qd6
        • 2.Se7#
      • 1...Sxb6
        • 2.Se7#
      • 1...Sf6
        • 2.Se7#
      • 1...Kxf5!
    • 1.Sc8+?
      • 1...Qd6
        • 2.Se7#
        • 2.c3#
        • 2.c4#
      • 1...Sxb6
        • 2.Se7#
      • 1...Sf6
        • 2.Se7#
      • 1...Kf5!
  • Keys
    • 1.S8f7!
      • threat
        • 2.Sh8#
      • 1...Qxc2+
        • 2.Bxc2#
        • 2.Qxc2#
      • 1...Qxg5
        • 2.c4#
      • 1...Qxd6
        • 2.c3#
      • 1...Bxf7
        • 2.Bxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_PINP(D)::QAB(B)+P(D)
    • B(j);N_GUARD,P_PINB(F)::B(F),XB(j)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • Q(c);N_PINP(D),P_SPINQ(c)::S(J)
        • S(g);XR(I)::S(J)
        • S(g);P_SPINS(g)::S(J)
      • Refutation
        • K(f);S_FLIGHT,XS(J)
    • Try
      • S(J);CHECK
      • Vars
        • S(g);XR(I)::S(J)
        • S(g);P_SPINS(g)::S(J)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • S(L);
    • Threat
      • S(L)
    • Vars
      • Q(c);N_PINP(D),P_SPINQ(c),XP(H)::QAB(B)+P(D)
      • Q(c);N_PINP(D),P_SPINQ(c),XS(J)::QAB(B)+P(D)
      • B(j);OGATE,P_PINB(F),XS(L)::B(F),XB(j)
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