MESON Chess Problem Database

Problem Display
PID: 83663 (2N3n1/3B4/1P1Bp2r/K2k4/1p1N3b/pP2PP2/2r1p3/1nR1q3 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Il Due Mosse, 1954

2N3n1/3B4/1P1Bp2r/K2k4/1p1N3b/pP2PP2/2r1p3/1nR1q3

#2

10 + 11

81 Chess 1960
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Bc6#
      • 2.Rc5#
    • 1...Rb2
      • 2.Bc6#
      • 2.Rc5#
    • 1...Rd2
      • 2.Bc6#
      • 2.Rc5#
    • 1...Rc4
      • 2.bxc4#
    • 1...Rc5+
      • 2.Rxc5#
    • 1...Rc6
      • 2.Bxc6#
    • 1...Rh5
      • 2.Bxe6#
    • 1...Rh7
      • 2.Bxe6#
    • 1...Rh8
      • 2.Bxe6#
    • 1...Bf6
      • 2.Bxe6#
    • 1...Sc3
      • 2.Bc6#
    • 1...Sf6
      • 2.Bxe6#
  • Tries
    • 1.Sxc2?
      • threat
        • 2.e4#
      • 1...Sd2
        • 2.Sxb4#
      • 1...Sc3
        • 2.Sxb4#
      • 1...Sf6!
    • 1.Sb5?
      • threat
        • 2.e4#
      • 1...Rc4
        • 2.bxc4#
      • 1...Sc3
        • 2.Sc7#
      • 1...Sf6
        • 2.Se7#
      • 1...Sd2!
    • 1.Rxc2?
      • threat
        • 2.Bc6#
        • 2.Rc5#
      • 1...Qc1
        • 2.Bc6#
      • 1...Sc3
        • 2.Bc6#
      • 1...Se7
        • 2.Rc5#
      • 1...Qc3!
  • Keys
    • 1.Sc6!
      • threat
        • 2.e4#
      • 1...Rc5+
        • 2.Rxc5#
      • 1...Rxc6
        • 2.Bxc6#
      • 1...Sd2
        • 2.Sxb4#
      • 1...Rc4
        • 2.bxc4#
      • 1...Sc3
        • 2.Sxb4#
      • 1...Sf6
        • 2.S6e7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(c);OGATE::P(B),XR(c)
    • R(c);CHECK,OGATE::R1(A),XR(c)
    • R(c);N_GUARD::B(I),XR(c)
    • R(j);N_GUARD::B(I),XP(i)
    • B(g);S_CUTR(j)::B(I),XP(i)
    • S(a);S_CUTR(c)::B(I)
    • S(k);S_CUTR(j)::B(I),XP(i)
  • Tries
    • Try
      • S(E);XR(c)
      • Threat
        • P(C)
      • Vars
        • S(a);S_CUTQ(b)::S(E),XP(f)
      • Refutation
        • S(k);
    • Try
      • S(E);
      • Threat
        • P(C)
      • Vars
        • R(c);OGATE::P(B),XR(c)
        • S(a);S_CUTR(c)::S(E)
        • S(k);N_GUARD,S_CUTB(g)::S(J)
      • Refutation
        • S(a);
    • Try
      • R(A);XR(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);::B(I)
        • S(a);::B(I)
        • S(k);::R1(A)
      • Refutation
        • Q(b);
  • Actual
    • S(E);
    • Threat
      • P(C)
    • Vars
      • R(c);CHECK,OGATE::R1(A),XR(c)
      • R(c);OGATE,XS(E)::B(I),XR(c)
      • S(a);S_CUTQ(b)::S(E),XP(f)
      • R(c);OGATE::P(B),XR(c)
      • S(k);N_GUARD,S_CUTB(g)::S(E)
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