MESON Chess Problem Database
Problem Display
PID: 21105 (B3r1n1/pq4Np/r3b2p/pR2N1n1/K1p1k3/2P3Rp/8/2b2Q2 w - - 0 1)
O'Keefe, John James
Good Companions (October), 1916
#2
8 + 14
| 3132 | The Good Companion Two-Mover | 1922 |
| 14868 | Pirnie Collection | 2012 |
SOLUTION
- SOUND
- Sets
- 1...Bf4
- 2.Qb1#
- 1...Bg4
- 2.Qxc4#
- 1...Bd5
- 2.Qf5#
- 1...Bf5
- 2.Qxc4#
- 2.Qxf5#
- 1...Bd7
- 2.Qxc4#
- 1...Bf7
- 2.Qf5#
- 1...Bc8
- 2.Qxc4#
- 1...Sf3
- 2.Qxf3#
- 1...Sf7
- 2.Qf3#
- 1...Bf4
- Tries
- 1.Sg4?
- threat
- 2.Re5#
- 1...Bxg4
- 2.Qxc4#
- 1...Sf3
- 2.Qxf3#
- 1...Qd5
- 2.Qxc4#
- 1...Bf4
- 2.Sf2#
- 2.Qb1#
- 1...Bd5
- 2.Qf5#
- 1...Bf5
- 2.Qxc4#
- 2.Qxf5#
- 1...Bd7
- 2.Qxc4#
- 1...Bf7
- 2.Qf5#
- 1...Bc8
- 2.Qxc4#
- 1...Sf7
- 2.Qf3#
- 1...Qc6!
- threat
- 1.Sd7?
- threat
- 2.Re5#
- 1...Bxd7
- 2.Qxc4#
- 1...Sf3
- 2.Qxf3#
- 1...Qd5
- 2.Qxc4#
- 1...Bf4
- 2.Qb1#
- 1...Bg4
- 2.Qxc4#
- 1...Bd5
- 2.Qf5#
- 1...Bf5
- 2.Qxc4#
- 2.Qxf5#
- 1...Bf7
- 2.Qf5#
- 1...Sf7
- 2.Qf3#
- 1...Qc6!
- threat
- 1.Bxb7+?
- 1...Bd5
- 2.Qf5#
- 1...Rc6!
- 1...Bd5
- 1.Rg4+?
- 1...Ke3
- 2.Qe1#
- 1...Bf4
- 2.Qe2#
- 2.Qe1#
- 2.Qxf4#
- 1...Bxg4!
- 1...Ke3
- 1.Qe2+?
- 1...Be3
- 2.Qxe3#
- 1...Kf4!
- 1...Be3
- 1.Qd3+?
- 1...Kf4
- 2.Sh5#
- 1...cxd3!
- 1...Kf4
- 1.Qe1+?
- 1...Be3
- 2.Qxe3#
- 1...Kf4!
- 1...Be3
- 1.Qh1+?
- 1...Sf3
- 2.Qxf3#
- 1...Kf4!
- 1...Sf3
- 1.Sg4?
- Keys
- 1.Sf7!
- threat
- 2.Re5#
- 1...Bxf7
- 2.Qf5#
- 1...Sxf7
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Qc6
- 2.Sd6#
- 1...Qd5
- 2.Qxc4#
- 1...Bf4
- 2.Qb1#
- 1...Bg4
- 2.Qxc4#
- 1...Bd5
- 2.Qf5#
- 1...Bf5
- 2.Qxc4#
- 2.Qxf5#
- 1...Bd7
- 2.Qxc4#
- 1...Bc8
- 2.Qxc4#
- threat
- 1.Sf7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- B(a);OGATE,SBLOCK::QAB(A)
- B(h);N_GUARD::QAR2(A),XP(c)
- B(h);N_GUARD,N_SPINQ(k)::QAB1(A)
- B(h);N_GUARD,P_PINR(E)::QAR2(A),XP(c)
- B(h);N_GUARD::QAB1(A)
- S(f);N_GUARD::QAB1(A),XS(f)
- S(f);N_GUARD::QAB1(A)
- Tries
- Try
- S(F);
- Threat
- R1(E)
- Vars
- B(h);N_GUARD,XS(F)::QAR2(A),XP(c)
- S(f);N_GUARD::QAB1(A),XS(f)
- Q(k);S_CUTB(h)::QAR2(A),XP(c)
- B(h);N_GUARD,N_SPINQ(k)::QAB1(A)
- B(h);N_GUARD,P_PINR(E)::QAR2(A),XP(c)
- B(h);N_GUARD::QAB1(A)
- B(h);N_GUARD::QAR2(A),XP(c)
- S(f);N_GUARD::QAB1(A)
- Refutation
- Q(k);P_PINR(E)
- Try
- S(F);
- Threat
- R1(E)
- Vars
- B(h);N_GUARD,P_PINR(E),XS(F)::QAR2(A),XP(c)
- S(f);N_GUARD::QAB1(A),XS(f)
- Q(k);S_CUTB(h)::QAR2(A),XP(c)
- B(a);OGATE,SBLOCK::QAB(A)
- B(h);N_GUARD::QAR2(A),XP(c)
- B(h);N_GUARD,N_SPINQ(k)::QAB1(A)
- B(h);N_GUARD::QAB1(A)
- S(f);N_GUARD::QAB1(A)
- Refutation
- Q(k);P_PINR(E)
- Try
- B(H);CHECK,XQ(k)
- Vars
- B(h);P_SPINB(h)::QAB1(A)
- Refutation
- R(g);P_SPINR(g)
- Try
- R(C);CHECK
- Vars
- K(d);N_SPINQ(k),P-FLIGHT::QAR2(A)
- Refutation
- B(h);XR(C)
- Try
- Q(A);CHECK
- Vars
- B(a);N_GUARD,P_SPINB(a)::QAR1(A),XB(a)
- Refutation
- K(d);N_SPINQ(k),P-FLIGHT
- Try
- Q(A);CHECK
- Vars
- K(d);N_SPINQ(k),P-FLIGHT::S(G)
- Refutation
- P(c);XQ(A)
- Try
- Q(A);CHECK
- Vars
- B(a);N_GUARD,P_SPINB(a)::QAR1(A),XB(a)
- Refutation
- K(d);N_SPINQ(k),P-FLIGHT
- Try
- Q(A);CHECK
- Vars
- S(f);N_GUARD,P_SPINS(f)::QAB1(A),XS(f)
- Refutation
- K(d);N_SPINQ(k),P-FLIGHT
- Try
- Actual
- S(F);
- Threat
- R1(E)
- Vars
- B(h);N_GUARD,XS(F)::QAB1(A)
- S(f);N_GUARD,XS(F)::QAB1(A)
- S(f);N_GUARD::QAB1(A),XS(f)
- Q(k);P_PINR(E),S_CUTR(g)::S(F)
- Q(k);S_CUTB(h)::QAR2(A),XP(c)
- B(a);OGATE,SBLOCK::QAB(A)
- B(h);N_GUARD::QAR2(A),XP(c)
- B(h);N_GUARD,N_SPINQ(k)::QAB1(A)
- B(h);N_GUARD,P_PINR(E)::QAR2(A),XP(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).