MESON Chess Problem Database
Problem Display
PID: 21189 (4K2b/p7/P3Q3/pk3qRr/N1R1b3/P3N3/P3nr2/3B4 w - - 0 1)
O'Keefe, John James
3rd Prize, Good Companions (March), 1917
#2
10 + 9
| 3132 | The Good Companion Two-Mover | 1922 |
| 57 | Tijdschrift vd KNSB | 1936 |
| 14868 | Pirnie Collection | 2012 |
SOLUTION
- SOUND
- Sets
- 1...Qc5
- 2.Rcxc5#
- 1...Qd5
- 2.Qc6#
- 1...Bb1
- 2.Qc6#
- 1...Bc2
- 2.Qc6#
- 1...Bd3
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Bc6+
- 2.Qxc6#
- 1...Be5
- 2.Rc5#
- 1...Sd4
- 2.Sc3#
- 1...Qc5
- Tries
- 1.Sxf5?
- threat
- 2.Sd4#
- 2.Rc5#
- 1...Bc6+
- 2.Qxc6#
- 1...Rxg5
- 2.Rc5#
- 1...Bxf5
- 2.Rc5#
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Bc2
- 2.Sd4#
- 2.Qc6#
- 1...Bd4
- 2.Sxd4#
- 1...Be5
- 2.Rc5#
- 1...Sd4
- 2.Sc3#
- 2.Sxd4#
- 2.Rc5#
- 1...Rxf5!
- threat
- 1.Sc3+?
- 1...Bxc3
- 2.Ba4#
- 2.a4#
- 1...Sxc3!
- 1...Bxc3
- 1.Bxe2?
- threat
- 2.Rb4#
- 1...Bc6+
- 2.Qxc6#
- 1...Bd3
- 2.Qc6#
- 1...Rxe2!
- threat
- 1.Rc1?
- threat
- 2.Qc4#
- 1...Bc6+
- 2.Qxc6#
- 1...Qc5
- 2.Rcxc5#
- 1...Qd5
- 2.Qc6#
- 1...Bd3
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Qe5!
- threat
- 1.Rc3?
- threat
- 2.Qc4#
- 1...Bc6+
- 2.Qxc6#
- 1...Qc5
- 2.Rcxc5#
- 1...Qd5
- 2.Qc6#
- 1...Bd3
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Qe5!
- threat
- 1.Rc7?
- threat
- 2.Qc4#
- 1...Bc6+
- 2.Qxc6#
- 1...Qd5
- 2.Rb7#
- 2.Qc6#
- 1...Bd3
- 2.Rb7#
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Qe5!
- threat
- 1.Rc8?
- threat
- 2.Qc4#
- 1...Bc6+
- 2.Qxc6#
- 1...Qd5
- 2.Rb8#
- 2.Qc6#
- 1...Bd3
- 2.Rb8#
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- 1...Qe5!
- threat
- 1.Qd7+?
- 1...Bc6
- 2.Qxc6#
- 1...Kxa6!
- 1...Bc6
- 1.Sxf5?
- Keys
- 1.Rc2!
- threat
- 2.Qc4#
- 1...Bc6+
- 2.Qxc6#
- 1...Kxa4
- 2.Qb3#
- 1...Qc5
- 2.Rcxc5#
- 1...Qd5
- 2.Qc6#
- 1...Qe5
- 2.Rb2#
- 1...Bd3
- 2.Qc6#
- 1...Bd5
- 2.Rc5#
- threat
- 1.Rc2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 4
- Sets
- Q(f);N_GUARD::R1(F),XQ(f)
- Q(f);S_CUTB(c)::QAB1(I)
- B(c);N_GUARD::QAB1(I)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- B(i);N_SPINQ(f),S_CUTQ(f)::R1(F)
- S(a);N_GUARD,S_CUTB(i)::S(E)
- Tries
- Try
- S(D);XQ(f)
- Threat
- DUALS(2)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- R(g);XR(G)::R1(F)
- B(c);::R1(F)
- B(i);::R(G)+S(D),DCHECK,XB(i)
- B(i);::R1(F)
- Refutation
- R(b);P_SPINR(b),XS(D)
- Try
- S(E);CHECK
- Refutation
- S(a);XS(E)
- Try
- B(A);XS(a)
- Threat
- B(A)+R(F),DCHECK
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- B(c);N_GUARD::QAB1(I)
- Refutation
- R(b);XB(A)
- Try
- R(F);
- Threat
- QAB1(I)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- Q(f);N_GUARD::R1(F),XQ(f)
- Q(f);S_CUTB(c)::QAB1(I)
- B(c);N_GUARD::QAB1(I)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
- Refutation
- Q(f);P_PINQ(I)
- Try
- R(F);
- Threat
- QAB1(I)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- Q(f);N_GUARD::R1(F),XQ(f)
- Q(f);S_CUTB(c)::QAB1(I)
- B(c);N_GUARD::QAB1(I)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
- Refutation
- Q(f);P_PINQ(I)
- Try
- R(F);
- Threat
- QAB1(I)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
- Refutation
- Q(f);P_PINQ(I)
- Try
- R(F);
- Threat
- QAB1(I)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
- Refutation
- Q(f);P_PINQ(I)
- Try
- Q(I);CHECK
- Vars
- B(c);N_GUARD,P_PINQ(I),P_SPINB(c)::QAB1(I),XB(c)
- Refutation
- K(e);N_SPINQ(f),S_FLIGHT,XP(H)
- Try
- Actual
- R(F);
- Threat
- QAB1(I)
- Vars
- B(c);CHECK,N_GUARD::QAB1(I),XB(c)
- K(e);N_SPINQ(f),S_FLIGHT,XS(E)::QAB1(I)
- Q(f);N_GUARD::R1(F),XQ(f)
- Q(f);S_CUTB(c)::QAB1(I)
- Q(f);P_PINQ(I),S_CUTB(i)::R(F)
- B(c);N_GUARD::QAB1(I)
- B(c);N_SPINQ(f),S_CUTQ(f)::R1(F)
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).