MESON Chess Problem Database

Problem Display
PID: 12093 (8/1p2QN2/6K1/3p4/2pk1p2/5p2/2R2P2/2N5 w - - 0 1)

Donnelly, Michael J

Sunderland Echo, 1974

8/1p2QN2/6K1/3p4/2pk1p2/5p2/2R2P2/2N5

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qb4#
  • Tries
    • 1.Kf5?
      • 1...c3
        • 2.Qb4#
      • 1...b5
        • 2.Qa7#
      • 1...b6!
    • 1.Se5?
      • threat
        • 2.Sxf3#
      • 1...Ke4
        • 2.Sc6#
      • 1...c3!
    • 1.Sd8?
      • 1...b6
        • 2.Sc6#
      • 1...b5
        • 2.Sc6#
      • 1...c3!
    • 1.Rxc4+?
      • 1...dxc4
        • 2.Qe5#
      • 1...Kxc4!
    • 1.Qf6+?
      • 1...Ke4
        • 2.Sg5#
        • 2.Sd6#
        • 2.Qe5#
      • 1...Kc5!
  • Keys
    • 1.Qxb7!
      • 1...Ke4
        • 2.Rxc4#
      • 1...Kc5
        • 2.Sb3#
      • 1...c3
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::QAR2(E)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(b);OGATEB::QAR2(E)
        • P(f);OGATE::QAB(E)
      • Refutation
        • P(f);
    • Try
      • S(F);
      • Threat
        • S(F),XP(a)
      • Vars
        • K(c);P-FLIGHT::QAR(E)+S(F)
      • Refutation
        • P(b);
    • Try
      • S(F);
      • Vars
        • P(f);N_GUARD::S(F)
      • Refutation
        • P(b);
    • Try
      • R(B);CHECK,XP(b)
      • Vars
        • P(e);SBLOCK,XR(B)::QAB1(E)
      • Refutation
        • K(c);P-FLIGHT,XR(B)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT
  • Actual
    • Q(E);XP(f)
    • Vars
      • K(c);P-FLIGHT,P_SPINP(e)::R(B),XP(b)
      • K(c);P_SPINP(b),S_FLIGHT::S(A)
      • P(b);OGATEB::QAR2(E)
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