MESON Chess Problem Database

Problem Display
PID: 267806 (b7/rn1pP3/p1k1P3/p1pN4/K1N1P3/8/8/8 w - - 0 1)

Macleod, Norman Alasdair

diagrammes, 1976

b7/rn1pP3/p1k1P3/p1pN4/K1N1P3/8/8/8

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Sxa5#
    • 1...Sd8
      • 2.exd8S#
    • 1...dxe6
      • 2.e8Q#
      • 2.e8B#
    • 1...d6
      • 2.e8Q#
      • 2.e8B#
  • Tries
    • 1.e8Q?
      • threat
        • 2.Qxd7#
        • 2.Qc8#
      • 1...Sd6
        • 2.Sxa5#
      • 1...Sd8!
    • 1.e8B?
      • threat
        • 2.Bxd7#
      • 1...Sd6
        • 2.Sxa5#
      • 1...Sd8!
  • Keys
    • 1.e8S!
      • threat
        • 2.Se5#
        • 2.Se7#
      • 1...dxe6
        • 2.Se5#
      • 1...Sd6
        • 2.Sxa5#
      • 1...Sd8
        • 2.Sxa5#
      • 1...d6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD,SBLOCK::S(B),XP(a)
    • S(f);OGATE::PXS(f)=S
    • P(g);XP(E)::P=Q
    • P(g);::P=Q
  • Tries
    • Try
      • P(F);P_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • S(f);N_GUARD,SBLOCK::S(B),XP(a)
      • Refutation
        • S(f);
    • Try
      • P(F);P_PINP(g)
      • Threat
        • B(F),XP(g)
      • Vars
        • S(f);N_GUARD,SBLOCK::S(B),XP(a)
      • Refutation
        • S(f);
  • Actual
    • P(F);
    • Threat
      • DUALS(2)
    • Vars
      • P(g);XP(E)::S(B)
      • S(f);N_GUARD::S(B),XP(a)
      • P(g);::S(D)
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