MESON Chess Problem Database

Problem Display
PID: 72373 (1B1N1R1b/4P1r1/b1Nnpn1q/R2p1k1P/rQ5P/p3P3/8/K2B4 w - - 0 1)

Ellerman, Arnoldo

Chess, 1953

1B1N1R1b/4P1r1/b1Nnpn1q/R2p1k1P/rQ5P/p3P3/8/K2B4

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.Bxg4#
    • 1...Rxe7
      • 2.Bg4#
    • 1...Rh7
      • 2.Bg4#
    • 1...Sc4
      • 2.Qb1#
    • 1...Se4
      • 2.Sd4#
    • 1...Sb5
      • 2.Bc2#
    • 1...Sb7
      • 2.e4#
    • 1...Sc8
      • 2.e4#
    • 1...Se8
      • 2.e4#
  • Tries
    • 1.Rxd5+?
      • 1...e5
        • 2.Rxe5#
      • 1...exd5!
    • 1.e4+?
      • 1...Sxe4
        • 2.Sd4#
      • 1...Kf4!
  • Keys
    • 1.e8S!
      • threat
        • 2.Sxd6#
      • 1...Qxh5
        • 2.Rxf6#
      • 1...Sxe8
        • 2.e4#
      • 1...Sc4
        • 2.Qb1#
      • 1...Qf4
        • 2.Rxf6#
      • 1...Rd7
        • 2.Bg4#
      • 1...Se4
        • 2.Sd4#
      • 1...Sb5
        • 2.Bc2#
      • 1...Sb7
        • 2.e4#
      • 1...Sf7
        • 2.Se7#
      • 1...Sc8
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(j);N_GUARD::B(B),XR(j)
    • R(j);N_GUARD,XP(I)::B(B)
    • R(j);N_GUARD::B(B)
    • S(f);N_GUARD,S_CUTB(e),S_CUTR(b)::QAB(D)
    • S(f);SBLOCK::S(H)
    • S(f);N_GUARD,N_SPINP(c),S_CUTB(e)::B(B)
    • S(f);N_GUARD::P(C)
  • Tries
    • Try
      • R(F);CHECK,XP(c)
      • Vars
        • P(g);P_SPINP(g)::R1(F),XP(g)
      • Refutation
        • P(g);XR(F)
    • Try
      • P(C);CHECK
      • Vars
        • S(f);SBLOCK,XP(C)::S(H)
      • Refutation
        • K(d);N_SPINP(c),N_SPINS(h),P-FLIGHT,P_SPINS(f)
  • Actual
    • P(I);
    • Threat
      • S(I),XS(f)
    • Vars
      • Q(i);N_GUARD,XP(G)::R1(L),XS(h)
      • S(f);N_GUARD,XS(I)::P(C)
      • S(f);N_GUARD,S_CUTB(e),S_CUTR(b)::QAB(D)
      • Q(i);N_GUARD::R1(L),XS(h)
      • R(j);N_GUARD::B(B)
      • S(f);SBLOCK::S(H)
      • S(f);N_GUARD,N_SPINP(c),S_CUTB(e)::B(B)
      • S(f);N_GUARD::P(C)
      • S(f);N_SPINS(h),S_CUTR(j)::S(H)
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