MESON Chess Problem Database

Problem Display
PID: 234445 (8/8/8/p1K5/k2N4/2R5/r7/1B6 w - - 0 1)

Lincoln, Robert A

ChessStar, 2012

8/8/8/p1K5/k2N4/2R5/r7/1B6

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Bc2#
    • 1...Rc2
      • 2.Bxc2#
    • 1...Ra3
      • 2.Rc4#
  • Tries
    • 1.Sc2?
      • 1...Rxc2
        • 2.Bxc2#
      • 1...Rb2
        • 2.Ra3#
      • 1...Ra3
        • 2.Rxa3#
      • 1...Ra1!
  • Keys
    • 1.Sb5!
      • 1...Ra1
        • 2.Bc2#
      • 1...Rb2
        • 2.Ra3#
      • 1...Rc2
        • 2.Bxc2#
      • 1...Rd2
        • 2.Ra3#
      • 1...Re2
        • 2.Ra3#
      • 1...Rf2
        • 2.Ra3#
      • 1...Rg2
        • 2.Ra3#
      • 1...Rh2
        • 2.Ra3#
      • 1...Ra3
        • 2.Rxa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::B(A)
    • R(a);N_GUARD,P_PINR(B)::B(A),XR(a)
    • R(a);SBLOCK::R(B)
  • Tries
    • Try
      • S(C);
      • Vars
        • R(a);OGATE,P_PINR(B),XS(C)::B(A),XR(a)
        • R(a);N_GUARD::R1(B)
        • R(a);N_GUARD::R1(B),XR(a)
      • Refutation
        • R(a);
  • Actual
    • S(C);
    • Vars
      • R(a);N_GUARD::B(A)
      • R(a);N_GUARD::R1(B)
      • R(a);N_GUARD,P_PINR(B)::B(A),XR(a)
      • R(a);N_GUARD,SBLOCK::R1(B)
      • R(a);N_GUARD::R1(B),XR(a)
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