MESON Chess Problem Database

Problem Display
PID: 181264 (2B5/7N/2p3P1/3k1q2/1P2N2Q/1KB2pp1/3P1b2/3n4 w - - 0 1)

O'Keefe, John James

British Chess Magazine, 1911

2B5/7N/2p3P1/3k1q2/1P2N2Q/1KB2pp1/3P1b2/3n4

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Shf6#
    • 1...Qxe4
      • 2.Qd8#
    • 1...Qg4
      • 2.Shf6#
    • 1...Qh5
      • 2.Shf6#
    • 1...Qf6
      • 2.Shxf6#
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Qxf5#
      • 1...Qxe4
        • 2.Qd8#
      • 1...Qxg6
        • 2.Qe5#
      • 1...Qxc8
        • 2.Qe5#
      • 1...Qxf6
        • 2.Shxf6#
      • 1...Sxc3
        • 2.Sxc3#
      • 1...Qh3
        • 2.Qe5#
      • 1...Qg4
        • 2.Qe5#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Qd7
        • 2.Qe5#
      • 1...Qf4
        • 2.Qe6#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qg5
        • 2.Qe6#
      • 1...Qh5
        • 2.Qe6#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Se3
        • 2.Qd4#
      • 1...c5
        • 2.Bb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_GUARD::S(H)
    • Q(f);N_GUARD,SBLOCK,XS(E)::QAR(F)
    • Q(f);N_GUARD::S(H),XQ(f)
  • Actual
    • Q(F);
    • Threat
      • QAR2(F),XQ(f)
    • Vars
      • K(e);S_FLIGHT,XS(E)::QAB1(F),XQ(f)
      • Q(f);N_GUARD,SBLOCK,XS(E)::QAR(F)
      • Q(f);N_GUARD,XP(G)::QAR1(F)
      • Q(f);N_GUARD,XB(I)::QAR1(F)
      • Q(f);XQ(F)::S(H),XQ(f)
      • S(a);XB(C)::S(E),XS(a)
      • Q(f);N_GUARD::QAR1(F)
      • Q(f);N_GUARD::QAB1(F),XQ(f)
      • Q(f);N_GUARD::QAB1(F)
      • Q(f);N_GUARD::QAR1(F),XQ(f)
      • B(b);N_GUARD::QAR1(F),XB(b)
      • S(a);S_CUTB(b)::QAR1(F)
      • P(g);OGATEB::B(I)
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