MESON Chess Problem Database

Problem Display
PID: 4672 (1R6/8/8/n1k5/8/8/K7/1R1Q4 w - - 0 1)

Carpenter, George Edward

International Chess Magazine, 1886

1R6/8/8/n1k5/8/8/K7/1R1Q4

#2

4 + 2

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Rc1#
    • 1...Kc6
      • 2.Rc8#
    • 1...Sc4
      • 2.Rc8#
    • 1...Sc6
      • 2.Rc1#
    • 1...Sb7
      • 2.Rc8#
  • Tries
    • 1.Ka1?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kc6
        • 2.Rc8#
      • 1...Sc4
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc1#
      • 1...Sb7
        • 2.Rc8#
      • 1...Sb3+!
    • 1.Rd8?
      • threat
        • 2.Qd5#
      • 1...Kc4
        • 2.Qc2#
        • 2.Qc1#
        • 2.Qd4#
      • 1...Kc6
        • 2.Rc8#
        • 2.Qd6#
      • 1...Sb3!
    • 1.Qd2?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kc6
        • 2.Rc8#
      • 1...Sc4
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc1#
      • 1...Sb7
        • 2.Rc8#
      • 1...Sb3!
    • 1.Qd3?
      • 1...Kc6
        • 2.Rc8#
      • 1...Sc4
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc1#
        • 2.R1b5#
        • 2.R8b5#
      • 1...Sb7
        • 2.Rc8#
      • 1...Sb3!
    • 1.Qd4+?
      • 1...Kc6
        • 2.Rc8#
      • 1...Kxd4!
    • 1.Qd6+?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kxd6!
    • 1.Qd7?
      • 1...Kc4
        • 2.Rc1#
      • 1...Sc4
        • 2.R1b5#
        • 2.R8b5#
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc1#
      • 1...Sb7
        • 2.Rc8#
      • 1...Sb3!
    • 1.Qd8?
      • 1...Kc4
        • 2.Rc1#
      • 1...Kc6
        • 2.Rc8#
      • 1...Sc4
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc1#
      • 1...Sb7
        • 2.Rc8#
      • 1...Sb3!
  • Keys
    • 1.R1b2!
      • 1...Kc4
        • 2.Rc2#
      • 1...Kc6
        • 2.Rc8#
      • 1...Sb3
        • 2.Rc2#
      • 1...Sc4
        • 2.Rc8#
      • 1...Sc6
        • 2.Rc2#
      • 1...Sb7
        • 2.Rc8#

Anticipated by 2075(1350)

This anticipates 132734(1958), 11700(1971), 176200(1976), 152675(2011)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::R(A)
    • K(b);P-FLIGHT::R(D)
    • S(a);N_GUARD,SBLOCK::R(D)
    • S(a);N_GUARD,SBLOCK::R(A)
    • S(a);N_GUARD::R(D)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(b);P-FLIGHT::R(A)
        • K(b);P-FLIGHT::R(D)
        • S(a);N_GUARD,SBLOCK::R(D)
        • S(a);N_GUARD,SBLOCK::R(A)
        • S(a);N_GUARD::R(D)
      • Refutation
        • S(a);CHECK
    • Try
      • R(D);
      • Threat
        • QAR1(B)
      • Refutation
        • S(a);
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::R(A)
        • K(b);P-FLIGHT::R(D)
        • S(a);N_GUARD,SBLOCK::R(D)
        • S(a);N_GUARD,SBLOCK::R(A)
        • S(a);N_GUARD::R(D)
      • Refutation
        • S(a);
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::R(D)
        • S(a);N_GUARD::R(D)
      • Refutation
        • S(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::R(A)
        • S(a);N_GUARD::R(A)
        • S(a);N_GUARD::R(D)
      • Refutation
        • S(a);
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::R(A)
        • K(b);P-FLIGHT::R(D)
        • S(a);N_GUARD,SBLOCK::R(D)
        • S(a);N_GUARD,SBLOCK::R(A)
        • S(a);N_GUARD::R(D)
      • Refutation
        • S(a);
  • Actual
    • R(A);
    • Vars
      • K(b);P-FLIGHT::R(A)
      • K(b);P-FLIGHT::R(D)
      • S(a);N_GUARD::R(A)
      • S(a);N_GUARD,SBLOCK::R(D)
      • S(a);N_GUARD,SBLOCK::R(A)
      • S(a);N_GUARD::R(D)
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