MESON Chess Problem Database
Problem Display
PID: 101161 (R4bB1/1P1pk2N/b5n1/K2Q3r/2p3n1/4N3/8/B2R4 w - - 0 1)
O'Keefe, John James
Good Companions, 1919
#2
9 + 8
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Rh1
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rh2
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rh3
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rh4
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rf5
- 2.Sxf5#
- 1...Rh6
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...Bb5
- 2.Qf7#
- 2.Qd6#
- 1...Sf2
- 2.Bf6#
- 1...Sh2
- 2.Bf6#
- 1...Sxe3
- 2.Bf6#
- 1...S4e5
- 2.Qd6#
- 1...Sf6
- 2.Bxf6#
- 1...Sh6
- 2.Bf6#
- 1...S6e5
- 2.Qd6#
- 1...Rh1
- Tries
- 1.Kb4?
- threat
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...d6
- 2.Qe6#
- 2.Qf7#
- 2.Qxd6#
- 1...Rf5
- 2.Sxf5#
- 2.Qd6#
- 2.Qxd7#
- 1...Bb5
- 2.Qf7#
- 2.Qd6#
- 1...S4e5
- 2.Qd6#
- 1...Sf6
- 2.Bxf6#
- 2.Qf7#
- 2.Qd6#
- 1...Sh6
- 2.Bf6#
- 2.Qd6#
- 2.Qxd7#
- 1...S6e5
- 2.Qd6#
- 1...Sh8
- 2.Qd6#
- 2.Qxd7#
- 1...Rxd5!
- threat
- 1.Kxa6?
- threat
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...d6
- 2.Qe6#
- 2.Qf7#
- 2.Qxd6#
- 1...Rf5
- 2.Sxf5#
- 2.Qd6#
- 2.Qxd7#
- 1...S4e5
- 2.Qd6#
- 1...Sf6
- 2.Bxf6#
- 2.Qf7#
- 2.Qd6#
- 1...Sh6
- 2.Bf6#
- 2.Qd6#
- 2.Qxd7#
- 1...S6e5
- 2.Qd6#
- 1...Sh8
- 2.Qd6#
- 2.Qxd7#
- 1...Rxd5!
- threat
- 1.Kb6?
- threat
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...d6
- 2.Qe6#
- 2.Qf7#
- 2.Qxd6#
- 1...Rf5
- 2.Sxf5#
- 2.Qd6#
- 2.Qxd7#
- 1...Bb5
- 2.Qf7#
- 2.Qd6#
- 1...S4e5
- 2.Qd6#
- 1...Sf6
- 2.Bxf6#
- 2.Qf7#
- 2.Qd6#
- 1...Sh6
- 2.Bf6#
- 2.Qd6#
- 2.Qxd7#
- 1...S6e5
- 2.Qd6#
- 1...Sh8
- 2.Qd6#
- 2.Qxd7#
- 1...Rxd5!
- threat
- 1.Sg5?
- threat
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Sxe3
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...S4e5
- 2.Qd6#
- 1...S6e5
- 2.Qd6#
- 1...c3
- 2.Qf7#
- 2.Qd6#
- 1...d6
- 2.Qe6#
- 2.Qf7#
- 2.Qxd6#
- 1...Rh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...Bb5
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 1...Sf6
- 2.Sf5#
- 2.Qf7#
- 2.Qd6#
- 1...Sh6
- 2.Qd6#
- 2.Qxd7#
- 1...Sh4
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Sh8
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxg5!
- threat
- 1.Be5?
- threat
- 2.Bd6#
- 2.Qf7#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxh7
- 2.Sf5#
- 2.Qd6#
- 2.Qxd7#
- 1...S4xe5
- 2.Qd6#
- 1...S6xe5
- 2.Qd6#
- 1...d6
- 2.Qe6#
- 2.Qf7#
- 2.Qxd6#
- 1...Rf5
- 2.Sxf5#
- 2.Bd6#
- 2.Qd6#
- 2.Qxd7#
- 1...Bb5
- 2.Bd6#
- 2.Qf7#
- 2.Qd6#
- 1...Sf6
- 2.Bd6#
- 2.Bxf6#
- 2.Qf7#
- 2.Qd6#
- 1...Sh6
- 2.Bd6#
- 2.Bf6#
- 2.Qd6#
- 2.Qxd7#
- 1...Sh8
- 2.Bd6#
- 2.Qd6#
- 2.Qxd7#
- 1...Rxe5!
- threat
- 1.Qg5+?
- 1...Sf6
- 2.Sf5#
- 2.Bxf6#
- 1...Rxg5+!
- 1...Sf6
- 1.b8Q?
- threat
- 2.Qd6#
- 2.Qd8#
- 2.Qe8#
- 1...Rxd5+
- 2.Sxd5#
- 1...d6
- 2.Qxd6#
- 2.Qc7#
- 2.Qd8#
- 2.Qe8#
- 1...Sf6
- 2.Bxf6#
- 2.Qd6#
- 2.Qd8#
- 1...Bc8!
- threat
- 1.Kb4?
- Keys
- 1.Qf5!
- threat
- 2.Rxd7#
- 1...Rxf5+
- 2.Sxf5#
- 1...d5
- 2.Qe6#
- 1...Bb5
- 2.Qf7#
- 1...S4e5
- 2.Qf6#
- 1...Sf6
- 2.Bxf6#
- 1...S6e5
- 2.Qxf8#
- 1...d6
- 2.Sd5#
- threat
- 1.Qf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 3
- REMOVED MATES = 4
- Sets
- R(c);N_GUARD::S(C),XR(c)
- S(b);N_GUARD::B(A)
- S(b);N_GUARD,XS(C)::B(A)
- S(b);N_PINQ(E)::QAB1(E)
- S(b);N_GUARD::B(A),XS(b)
- S(e);N_PINQ(E)::QAB1(E)
- Tries
- Try
- K(D);N_SPINQ(E),S_FLIGHT
- Threat
- DUALS(3)
- Vars
- S(b);::QAB1(E)
- S(e);::QAB1(E)
- Refutation
- R(c);XQ(E)
- Try
- K(D);N_SPINQ(E),P-FLIGHT,XB(d)
- Threat
- DUALS(3)
- Vars
- S(b);::QAB1(E)
- S(e);::QAB1(E)
- Refutation
- R(c);XQ(E)
- Try
- K(D);N_SPINQ(E),S_FLIGHT
- Threat
- DUALS(3)
- Vars
- S(b);::QAB1(E)
- S(e);::QAB1(E)
- Refutation
- R(c);XQ(E)
- Try
- S(G);N_SPINQ(E)
- Threat
- DUALS(4)
- Vars
- S(b);::QAB1(E)
- S(e);::QAB1(E)
- Refutation
- R(c);P_PINQ(E),XS(G)
- Try
- B(A);N_SPINQ(E)
- Threat
- DUALS(4)
- Vars
- S(b);XB(A)::QAB1(E)
- S(e);XB(A)::QAB1(E)
- Refutation
- R(c);P_PINQ(E),XB(A)
- Try
- Q(E);CHECK
- Refutation
- R(c);CHECK,XQ(E)
- Try
- P(F);
- Threat
- DUALS(3)
- Vars
- R(c);CHECK,XQ(E)::S(C),XR(c)
- Refutation
- B(d);
- Try
- Actual
- Q(E);
- Threat
- R1(B),XP(f)
- Vars
- R(c);CHECK,XQ(E)::S(C),XR(c)
- P(f);N_PINQ(E)::QAR1(E)
- B(d);N_PINQ(E)::QAR1(E)
- S(b);N_PINQ(E)::QAB1(E)
- S(b);N_GUARD::B(A),XS(b)
- S(e);N_PINQ(E)::QAB1(E),XB(h)
- P(f);SBLOCK::S(C)
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).