MESON Chess Problem Database

Problem Display
PID: 178557 (K2bB1Q1/Rn2kN1p/p6r/r4PP1/1N2q3/3b4/8/4R3 w - - 0 1)

Ellerman, Arnoldo

2nd HM., Bulletin Ouvrier des Echecs, 1952

K2bB1Q1/Rn2kN1p/p6r/r4PP1/1N2q3/3b4/8/4R3

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6
      • 2.Sc6#
    • 1...Ra1
      • 2.Sd5#
    • 1...Ra2
      • 2.Sd5#
    • 1...Ra3
      • 2.Sd5#
    • 1...Ra4
      • 2.Sd5#
    • 1...Rd5
      • 2.Sxd5#
    • 1...Rh1
      • 2.Sc6#
    • 1...Rh2
      • 2.Sc6#
    • 1...Rh3
      • 2.Sc6#
    • 1...Rh4
      • 2.Sc6#
    • 1...Rh5
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Bb5
      • 2.Sd5#
  • Tries
    • 1.Rxe4+?
      • 1...Re5
        • 2.Sd5#
      • 1...Re6
        • 2.Sc6#
        • 2.Rxe6#
        • 2.f6#
      • 1...Bxe4!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Qe8#
      • 1...Sc5+
        • 2.Sd5#
      • 1...Sd6+
        • 2.Sc6#
      • 1...Kxd7
        • 2.Qxd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(b);S_CUTR(e)::S(B)
    • R(c);N_GUARD::S(B)
    • R(c);N_GUARD::S(B),XR(c)
    • R(e);N_GUARD::S(B)
    • R(e);N_GUARD::S(B),XR(e)
    • B(a);S_CUTR(c)::S(B)
  • Tries
    • Try
      • R(A);CHECK,XQ(b)
      • Vars
        • R(c);P_SPINR(c)::S(B)
      • Refutation
        • B(a);XR(A)
  • Actual
    • B(H);N_PINS(f)
    • Threat
      • QAR1(I)
    • Vars
      • S(f);CHECK,S_CUTR(c)::S(B)
      • S(f);CHECK,S_CUTR(e)::S(B)
      • K(g);N_SPINQ(b),P-FLIGHT,P_SPINS(f),XB(H)::QAR1(I),XB(i)
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