MESON Chess Problem Database

Problem Display
PID: 218851 (8/8/8/8/4N3/6Kn/6RP/7k w - - 0 1)

Lewis, Robert Tony

The Problemist, 1987

8/8/8/8/4N3/6Kn/6RP/7k

#2

4 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg1
      • 2.Sf2#
    • 1...Sf2
      • 2.Sxf2#
    • 1...Sf4
      • 2.Sf2#
    • 1...Sg5
      • 2.Sf2#
  • Tries
    • 1.Rg1+?
      • 1...Sxg1
        • 2.Sf2#
      • 1...Kxg1!
    • 1.Ra2?
      • 1...Kg1
        • 2.Ra1#
      • 1...Sg1
        • 2.Sf2#
      • 1...Sf4
        • 2.Ra1#
      • 1...Sg5
        • 2.Ra1#
      • 1...Sf2!
    • 1.Rb2?
      • 1...Kg1
        • 2.Rb1#
      • 1...Sg1
        • 2.Sf2#
      • 1...Sf4
        • 2.Rb1#
      • 1...Sg5
        • 2.Rb1#
      • 1...Sf2!
    • 1.Rc2?
      • 1...Kg1
        • 2.Rc1#
      • 1...Sg1
        • 2.Sf2#
      • 1...Sf4
        • 2.Rc1#
      • 1...Sg5
        • 2.Rc1#
      • 1...Sf2!
    • 1.Rd2?
      • 1...Kg1
        • 2.Rd1#
      • 1...Sg1
        • 2.Sf2#
      • 1...Sf4
        • 2.Rd1#
      • 1...Sg5
        • 2.Rd1#
      • 1...Sf2!
  • Keys
    • 1.Re2!
      • 1...Kg1
        • 2.Re1#
      • 1...Sf2
        • 2.Re1#
      • 1...Sg1
        • 2.Sf2#
      • 1...Sf4
        • 2.Re1#
      • 1...Sg5
        • 2.Re1#

Anticipated by 28294(0000), 159748(1926)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::S(D)
    • S(b);N_GUARD::S(D),XS(b)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • S(b);SBLOCK,XR(A)::S(D)
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • R(A);
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(A)
      • Refutation
        • S(b);
    • Try
      • R(A);
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(A)
      • Refutation
        • S(b);
    • Try
      • R(A);
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(A)
      • Refutation
        • S(b);
    • Try
      • R(A);
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(A)
      • Refutation
        • S(b);
  • Actual
    • R(A);
    • Vars
      • K(a);P-FLIGHT::R(A)
      • S(b);N_GUARD::R(A)
      • S(b);N_GUARD,SBLOCK::S(D)
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