MESON Chess Problem Database

Problem Display
PID: 83637 (N1k5/P2R1n1K/2P3p1/2R3b1/7p/nq5B/b7/8 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1936

N1k5/P2R1n1K/2P3p1/2R3b1/7p/nq5B/b7/8

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sb6#
    • 1...Qc2
      • 2.Sb6#
    • 1...Qa4
      • 2.Sb6#
    • 1...Qc4
      • 2.Sb6#
    • 1...Qd5
      • 2.Sb6#
      • 2.Rdxd5#
    • 1...Qe6
      • 2.Sb6#
    • 1...Qb2
      • 2.Rdd5#
    • 1...Qc3
      • 2.Sb6#
    • 1...Qd3
      • 2.Sb6#
    • 1...Qe3
      • 2.Sb6#
    • 1...Qf3
      • 2.Sb6#
    • 1...Qg3
      • 2.Sb6#
    • 1...Qxh3
      • 2.Sb6#
    • 1...Qb5
      • 2.Rdd5#
    • 1...Qb6
      • 2.Sxb6#
      • 2.Rdd5#
    • 1...Qb7
      • 2.cxb7#
    • 1...Qb8
      • 2.Rdd5#
    • 1...Be3
      • 2.Rdd5#
    • 1...Bd8
      • 2.Rc7#
    • 1...Sc4
      • 2.Rd3#
    • 1...Sb5
      • 2.Sb6#
    • 1...Sd8
      • 2.Rc7#
  • Tries
    • 1.Rcd5?
      • threat
        • 2.Rc7#
        • 2.Rd8#
      • 1...Qxd5
        • 2.Sb6#
        • 2.Rxd5#
      • 1...Qxh3
        • 2.Sb6#
        • 2.Rc7#
      • 1...Bd8
        • 2.Rc7#
        • 2.Rxd8#
      • 1...Sd8
        • 2.Rc7#
        • 2.Rxd8#
      • 1...Sd6!
    • 1.Rb7+?
      • 1...Qe6
        • 2.Rb8#
      • 1...Qxh3
        • 2.Rb8#
      • 1...Kd8!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Sb6#
      • 1...Qxb5
        • 2.Rd5#
      • 1...Qe3
        • 2.Rb8#
      • 1...Be3
        • 2.Rdd5#
      • 1...Bd8
        • 2.Rc7#
      • 1...Sc4
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 15
  • Sets
    • Q(c);N_GUARD::S(G)
    • Q(c);N_GUARD::B(A)+R(E)
    • Q(c);N_GUARD,XB(A)::S(G)
    • Q(c);OGATE::R(B)+P(C)DCHECK,XQ(c)
    • B(e);S_CUTQ(c)::B(A)+R(E)
    • B(e);SBLOCK::B(A)+R(E),DCHECK
    • S(b);S_CUTQ(c)::B(A)+R(E)
    • S(b);S_CUTQ(c)::S(G)
    • S(g);SBLOCK::B(A)+R(E),DCHECK
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Refutation
        • S(g);
    • Try
      • R(E);CHECK
      • Vars
        • Q(c);P_SPINQ(c)::R1(E)
        • Q(c);XB(A)::R1(E)
      • Refutation
        • K(h);P-FLIGHT
  • Actual
    • R(B);
    • Threat
      • S(G)
    • Vars
      • Q(c);N_GUARD,XR(B)::B(A)+R(E)
      • Q(c);N_GUARD::R1(B)
      • B(e);S_CUTQ(c)::B(A)+R(E)
      • B(e);SBLOCK::B(A)+R(E),DCHECK
      • S(b);S_CUTQ(c)::B(A)+R(E)
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