MESON Chess Problem Database

Problem Display
PID: 153226 (8/q7/8/1R6/7R/5n1K/4N3/7k w - - 0 1)

McDowell, Michael

4th Comm., StrateGems 02. Miniature Ty., 2011

8/q7/8/1R6/7R/5n1K/4N3/7k

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Kg3#
    • 1...Sd2
      • 2.Kg3#
    • 1...Sd4
      • 2.Kg3#
      • 2.Rb1#
    • 1...Se5
      • 2.Kg3#
  • Tries
    • 1.Kg3+?
      • 1...Sh2
        • 2.Rxh2#
      • 1...Sxh4!
  • Keys
    • 1.Rb1+!
      • 1...Qg1
        • 2.Sg3#
      • 1...Se1
        • 2.Kg3#
      • 1...Sg1+
        • 2.Kg3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::R(C)+K(B)
  • Tries
    • Try
      • K(B);CHECK,P-FLIGHT
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::R1(C),XS(b)
      • Refutation
        • S(b);XR(C)
  • Actual
    • R(D);CHECK
    • Vars
      • Q(c);P_SPINQ(c)::S(A)
      • S(b);P_SPINS(b)::R(C)+K(B)
      • S(b);CHECK,P_SPINS(b)::R(C)+K(B)
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