MESON Chess Problem Database
Problem Display
PID: 202357 (nR5K/3kprR1/1p4NN/1P6/2Bb4/1n1Q2B1/8/8 w - - 0 1)
O'Keefe, John James
1st Prize, Australian Columns, 1923
#2
9 + 7
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Rf5
- 2.Qxf5#
- 1...Rf6
- 2.Rxe7#
- 1...Rxg7
- 2.Sf8#
- 1...Rf8+
- 2.Sxf8#
- 1...Sa1
- 2.Qxd4#
- 1...Sc1
- 2.Qxd4#
- 1...Sd2
- 2.Qxd4#
- 1...Sa5
- 2.Qxd4#
- 1...Sc5
- 2.Qxd4#
- 1...Rf5
- Tries
- 1.Sxf7?
- threat
- 2.Sf8#
- 2.Rd8#
- 1...e6
- 2.Sg5#
- 2.Sh6#
- 2.Rd8#
- 1...e5!
- threat
- 1.Be5?
- 1...Rf8+
- 2.Sxf8#
- 1...Rxg7
- 2.Sf8#
- 1...Rf1
- 2.Rxe7#
- 1...Rf2
- 2.Rxe7#
- 1...Rf3
- 2.Rxe7#
- 1...Rf4
- 2.Rxe7#
- 1...Rf5
- 2.Rxe7#
- 2.Qxf5#
- 1...Rf6
- 2.Rxe7#
- 1...Sa1
- 2.Qxd4#
- 1...Sc1
- 2.Qxd4#
- 1...Sd2
- 2.Qxd4#
- 1...Sa5
- 2.Qxd4#
- 1...Sc5
- 2.Qxd4#
- 1...e6
- 2.Rxf7#
- 1...Sc7!
- 1...Rf8+
- 1.Bxf7?
- threat
- 2.Sf8#
- 1...e6
- 2.Be8#
- 2.Bg8#
- 1...e5!
- threat
- 1.Qe4?
- threat
- 2.Be6#
- 2.Qd5#
- 2.Qc6#
- 2.Qe6#
- 1...Rf8+
- 2.Sxf8#
- 1...Rf4
- 2.Qc6#
- 2.Qxe7#
- 1...Be5
- 2.Qc6#
- 1...e5
- 2.Qc6#
- 1...Rf5
- 2.Be6#
- 2.Qxf5#
- 2.Qc6#
- 2.Qe6#
- 2.Qxe7#
- 1...Rf6
- 2.Rxe7#
- 2.Qxe7#
- 1...Bc5
- 2.Be6#
- 2.Qc6#
- 2.Qe6#
- 1...Sa5
- 2.Be6#
- 2.Qd5#
- 2.Qxd4#
- 2.Qe6#
- 1...Sc5
- 2.Qd5#
- 2.Qc6#
- 2.Qxd4#
- 1...Sc7
- 2.Qc6#
- 1...e6
- 2.Bxe6#
- 2.Qc6#
- 2.Qxe6#
- 1...Bxg7+!
- threat
- 1.Qf5+?
- 1...e6
- 2.Bxe6#
- 2.Qxe6#
- 2.Qxf7#
- 1...Rxf5!
- 1...e6
- 1.Sxf7?
- Keys
- 1.Sf5!
- 1...Rf8+
- 2.Sxf8#
- 1...Rxf5
- 2.Qxf5#
- 1...Rxg7
- 2.Sf8#
- 1...e5
- 2.Rxf7#
- 1...Rf6
- 2.Rxe7#
- 1...Sa1
- 2.Qxd4#
- 1...Sc1
- 2.Qxd4#
- 1...Sd2
- 2.Qxd4#
- 1...Sa5
- 2.Qxd4#
- 1...Sc5
- 2.Qxd4#
- 1...Sc7
- 2.Se5#
- 1...e6
- 2.Sf8#
- 1...Rf8+
- 1.Sf5!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- R(f);N_GUARD,P_SPINP(e)::QAB(A),XR(f)
- R(f);N_PINR(G),P_SPINP(e)::R1(G),XP(e)
- R(f);N_GUARD,XR(G)::S(E)
- R(f);CHECK,N_GUARD,P_SPINP(e)::S(E),XR(f)
- S(a);N_GUARD::QAR(A),XB(b)
- Tries
- Try
- S(F);XR(f)
- Threat
- DUALS(2)
- Refutation
- P(e);N_PINR(G)
- Try
- B(B);N_SPINR(G)
- Vars
- R(f);CHECK,N_GUARD,P_SPINP(e)::S(E),XR(f)
- R(f);N_GUARD,XR(G)::S(E)
- R(f);OGATE,P_SPINP(e)::R1(G),XP(e)
- S(a);N_GUARD::QAR(A),XB(b)
- P(e);OGATEB,P_SPINR(f)::R(G),XR(f)
- Refutation
- S(g);
- Try
- B(C);XR(f)
- Threat
- S(E)
- Refutation
- P(e);N_PINR(G)
- Try
- Q(A);N_PINB(b)
- Threat
- DUALS(4)
- Vars
- R(f);CHECK,N_GUARD,P_SPINP(e)::S(E),XR(f)
- B(b);::QAB1(A)
- P(e);N_PINR(G),P_SPINR(f)::QAB1(A)
- S(g);::QAB1(A)
- Refutation
- B(b);CHECK,XR(G)
- Try
- Q(A);CHECK,N_PINB(b)
- Refutation
- R(f);P_SPINP(e),XQ(A)
- Try
- Actual
- S(F);
- Vars
- R(f);CHECK,N_GUARD,P_SPINP(e)::S(E),XR(f)
- R(f);OGATE,P_SPINP(e),XS(F)::QAB(A),XR(f)
- R(f);N_GUARD,XR(G)::S(E)
- P(e);N_PINR(G),P_SPINR(f)::R(G),XR(f)
- R(f);N_PINR(G),P_SPINP(e)::R1(G),XP(e)
- S(a);N_GUARD::QAR(A),XB(b)
- S(g);SBLOCK::S(E)
- P(e);P_SPINR(f)::S(E)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).