MESON Chess Problem Database

Problem Display
PID: 245268 (BQ6/5pN1/2q5/2Pn3r/b2Nk2n/6R1/2PR1PP1/2K5 w - - 0 1)

Feoktistov, Aleksandr Fedorovich

64 Shakhmatnoe obozrenie, 1973

BQ6/5pN1/2q5/2Pn3r/b2Nk2n/6R1/2PR1PP1/2K5

#2

11 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Re3#
      • 2.Rg4#
    • 1...Qd7
      • 2.Re3#
    • 1...Qe8
      • 2.Re3#
      • 2.Rg4#
    • 1...Qxc5
      • 2.Re3#
      • 2.Rg4#
    • 1...Qa6
      • 2.Re3#
      • 2.Rg4#
    • 1...Qb6
      • 2.Re3#
      • 2.Rg4#
    • 1...Qe6
      • 2.Re3#
    • 1...Qf6
      • 2.Re3#
    • 1...Qg6
      • 2.Re3#
    • 1...Qc8
      • 2.Re3#
    • 1...Sf3
      • 2.gxf3#
  • Tries
    • 1.Se2?
      • threat
        • 2.Rd4#
      • 1...Qxc5
        • 2.Rg4#
        • 2.Qf4#
      • 1...Qd6
        • 2.Re3#
      • 1...Qc7
        • 2.Re3#
      • 1...Sc7
        • 2.Re3#
      • 1...Qf6
        • 2.Re3#
      • 1...Qh6
        • 2.Sc3#
      • 1...Sf3
        • 2.gxf3#
      • 1...Sf5!
    • 1.Sxc6?
      • threat
        • 2.Rd4#
      • 1...Sf3
        • 2.gxf3#
      • 1...Sf5
        • 2.Qe5#
      • 1...Bxc6!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Rd4#
      • 1...Qxc5
        • 2.Rg4#
      • 1...Sxf3
        • 2.gxf3#
      • 1...Qf6
        • 2.Re2#
      • 1...Qh6
        • 2.Qb4#
      • 1...Sf5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(f);P_SPINS(d)::R1(F)
    • S(c);OGATE::P(E),XS(c)
  • Tries
    • Try
      • S(G);
      • Threat
        • R1(C)
      • Vars
        • Q(f);P_SPINS(d)::R1(F)
        • S(d);N_GUARD,P_SPINQ(f)::R1(F)
        • Q(f);P_PINR(C),P_SPINS(d)::S(G)
        • S(c);OGATE::P(E),XS(c)
      • Refutation
        • S(c);
    • Try
      • S(G);XQ(f)
      • Threat
        • R1(C)
      • Vars
        • S(c);OGATE::P(E),XS(c)
        • S(c);S_CUTR(e)::QAR1(K)
      • Refutation
        • B(a);XS(G)
  • Actual
    • S(G);
    • Threat
      • R1(C)
    • Vars
      • Q(f);P_PINP(B),P_SPINS(d),XP(H)::R(F)
      • S(c);OGATE,XS(G)::P(E),XS(c)
      • Q(f);P_SPINS(d)::R(C)
      • Q(f);P_PINR(C),P_SPINS(d)::QAR(K)
      • S(c);S_CUTR(e)::QAR1(K)
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