MESON Chess Problem Database

Problem Display
PID: 10523 (4N3/b7/b4P1K/6Rp/R1nqk3/3NP1P1/4BPP1/B2r4 w - - 0 1)

Grossman, Itzhak

Hirschenson, Aaron

Probleemblad, 1965

4N3/b7/b4P1K/6Rp/R1nqk3/3NP1P1/4BPP1/B2r4

#2

12 + 7

5862 An ABC of Chess Problems 1970
4640 Chess Wizardry: The New ABC of Chess Problems 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa1
      • 2.Sd6#
    • 1...Qb2
      • 2.Sd6#
    • 1...Qc3
      • 2.Sd6#
    • 1...Qxe3
      • 2.Sd6#
    • 1...Qe5
      • 2.Rxe5#
    • 1...Qb6
      • 2.Re5#
    • 1...Qxf6+
      • 2.Sxf6#
    • 1...Qxd3
      • 2.Bf3#
      • 2.Re5#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qd7
      • 2.Re5#
    • 1...Qd8
      • 2.Re5#
    • 1...Rxd3
      • 2.Bf3#
    • 1...Sb2
      • 2.Sd6#
      • 2.Re5#
    • 1...Sd2
      • 2.Sd6#
      • 2.Re5#
    • 1...Sa3
      • 2.Sd6#
      • 2.Re5#
    • 1...Sxe3
      • 2.Sd6#
      • 2.Re5#
      • 2.f3#
    • 1...Sa5
      • 2.Sd6#
      • 2.Re5#
    • 1...Se5
      • 2.Rxe5#
    • 1...Sb6
      • 2.Sc5#
      • 2.Sd6#
      • 2.Rxd4#
      • 2.Re5#
    • 1...Sd6
      • 2.Sxd6#
      • 2.Re5#
  • Tries
    • 1.Sd6+?
      • 1...Sxd6
        • 2.Re5#
      • 1...Qxd6!
    • 1.Rxc4?
      • threat
        • 2.Sd6#
        • 2.Re5#
      • 1...Rxd3
        • 2.Sd6#
        • 2.Bf3#
      • 1...Bc5
        • 2.Sxc5#
        • 2.Re5#
      • 1...Bb8
        • 2.Sc5#
        • 2.Rxd4#
      • 1...Bxc4!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Bf3#
      • 1...Qxf6+
        • 2.Sxf6#
      • 1...Qxe3
        • 2.Re5#
      • 1...Sd2
        • 2.Sd6#
      • 1...Se5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD,P_SPINS(b),XB(A)::S(L)
    • Q(c);N_GUARD,P_SPINS(b)::S(L)
    • Q(c);N_GUARD,P_PINR(I),P_SPINS(b),XP(F)::S(L)
    • Q(c);N_GUARD,P_SPINS(b)::R1(I),XQ(c)
    • Q(c);N_GUARD,P_PINP(J),P_SPINS(b)::R1(I)
    • Q(c);CHECK,P_SPINS(b),XP(J)::S(L),XQ(c)
    • Q(c);N_GUARD,P_PINP(J),P_SPINS(b)::S(L),XQ(c)
    • Q(c);N_GUARD,P_SPINS(b)::R1(I)
    • R(a);SBLOCK,XS(E)::B(B)
    • S(b);N_GUARD,P_SPINQ(c)::R1(I),XS(b)
  • Tries
    • Try
      • S(L);CHECK
      • Vars
        • S(b);P_SPINQ(c),XS(L)::R1(I)
      • Refutation
        • Q(c);P_PINP(J),P_SPINS(b),XS(L)
    • Try
      • R(H);P_PINQ(c),XS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • B(f);N_SPINQ(c),XR(H)
  • Actual
    • S(E);
    • Threat
      • B(B)
    • Vars
      • Q(c);CHECK,P_SPINS(b),XP(J)::S(L),XQ(c)
      • Q(c);N_GUARD,P_SPINS(b),XP(F)::R1(I)
      • S(b);N_GUARD,P_SPINQ(c)::S(L)
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