MESON Chess Problem Database

Problem Display
PID: 209317 (7K/5R2/5npk/8/5P2/6N1/8/8 w - - 0 1)

Lewis, Robert Tony

The Problemist, 1984

7K/5R2/5npk/8/5P2/6N1/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Rh7#
    • 1...Sg4
      • 2.Rh7#
    • 1...Sd5
      • 2.Rh7#
    • 1...Sh5
      • 2.Rh7#
    • 1...Sd7
      • 2.Rh7#
    • 1...Sh7
      • 2.Rxh7#
    • 1...Se8
      • 2.Rh7#
    • 1...Sg8
      • 2.Rh7#
    • 1...g5
      • 2.Rxf6#
  • Tries
    • 1.Re7?
      • 1...Sd7
        • 2.Rh7#
      • 1...Se4
        • 2.Rh7#
      • 1...Sg4
        • 2.Rh7#
      • 1...Sd5
        • 2.Rh7#
      • 1...Sh5
        • 2.Rh7#
      • 1...Sh7
        • 2.Rxh7#
      • 1...Se8
        • 2.Rh7#
      • 1...Sg8
        • 2.Rh7#
      • 1...g5!
  • Keys
    • 1.Rg7!
      • 1...Sd7
        • 2.Rh7#
      • 1...Se4
        • 2.Rh7#
      • 1...Sg4
        • 2.Rh7#
      • 1...Sd5
        • 2.Rh7#
      • 1...Sh5
        • 2.Rh7#
      • 1...Sh7
        • 2.Rxh7#
      • 1...Se8
        • 2.Rh7#
      • 1...Sg8
        • 2.Rh7#
      • 1...g5
        • 2.fxg5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R1(C)
    • S(a);N_GUARD::R1(C),XS(a)
    • P(b);OGATEB::R(C),XS(a)
  • Tries
    • Try
      • R(C);
      • Vars
        • S(a);N_GUARD::R1(C)
        • S(a);N_GUARD::R1(C),XS(a)
      • Refutation
        • P(b);
  • Actual
    • R(C);
    • Vars
      • S(a);N_GUARD::R1(C)
      • S(a);N_GUARD::R1(C),XS(a)
      • P(b);OGATE::P(B),XP(b)
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