MESON Chess Problem Database

Problem Display
PID: 171023 (kr3R2/4N1nR/K7/8/8/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

kr3R2/4N1nR/K7/8/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.Rxc8#
    • 1...Rd8
      • 2.Rxd8#
  • Tries
    • 1.Rxg7?
      • 1...Rc8
        • 2.Rxc8#
      • 1...Rd8
        • 2.Rxd8#
      • 1...Re8
        • 2.Rxe8#
      • 1...Rxf8!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Sb6#
      • 1...Rb6+
        • 2.Sxb6#
      • 1...Rxc8
        • 2.Rxc8#
      • 1...Se8
        • 2.Ra7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATEB::R(D),XR(c)
  • Tries
    • Try
      • R(C);XS(a)
      • Vars
        • R(c);OGATEB::R(D),XR(c)
      • Refutation
        • R(c);N_SPINR(c),XR(D)
  • Actual
    • S(B);N_PINR(c)
    • Threat
      • S(B)
    • Vars
      • R(c);CHECK::R(D)+S(B),DCHECK,XR(c)
      • R(c);OGATE,P_SPINR(c),XS(B)::R(D),XR(c)
      • S(a);OGATE::R1(C)
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