MESON Chess Problem Database

Problem Display
PID: 9760 (3r4/3NN3/pP1k1P2/n4K2/Qp1p4/8/2P5/8 w - - 0 1)

O'Keefe, John James

1st Prize, Melbourne Leader EP Ty., 1909

3r4/3NN3/pP1k1P2/n4K2/Qp1p4/8/2P5/8

#2

7 + 6

3360 Simple Two-move Themes 1924
5501 Chess Cameos 1936

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd7
      • 2.Qxb4#
    • 1...Sb3
      • 2.Qc6#
    • 1...Sc4
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sb7
      • 2.Qc6#
    • 1...b3
      • 2.Qxd4#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Se4#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Kxc5!
  • Keys
    • 1.c4!
      • threat
        • 2.c5#
      • 1...Rxd7
        • 2.Qxb4#
      • 1...Sxc4
        • 2.Qc6#
      • 1...bxc4 ep
        • 2.Qxd4#
      • 1...dxc4 ep
        • 2.Qd1#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sb3
        • 2.Qc6#
      • 1...Rc8
        • 2.Sxc8#
      • 1...Sb7
        • 2.Qc6#

There are these versions: 192735

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(f);SBLOCK,XS(F)::QAB(B),XP(a)
    • S(c);N_GUARD::QAR1(B)
    • S(c);N_GUARD::QAR1(B),XS(c)
    • P(a);OGATE::QAR2(B),XP(b)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • S(c);N_GUARD::QAR1(B),XS(c)
      • Refutation
        • K(e);S_FLIGHT,XS(F)
  • Actual
    • P(A);
    • Threat
      • P(A)
    • Vars
      • R(f);SBLOCK,XS(F)::QAB(B),XP(a)
      • S(c);N_GUARD,XP(A)::QAR1(B)
      • P(a);EP,OGATE,XP(A)::QAR2(B),XP(b)
      • P(b);EP,OGATEB,XP(A)::QAR(B)
      • S(c);N_GUARD::QAR1(B),XS(c)
      • S(c);N_GUARD::QAR1(B)
      • R(f);N_GUARD::S(G),XR(f)
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