MESON Chess Problem Database
Problem Display
PID: 21844 (R1b2b2/1NkppRp1/6P1/1BPQK3/N7/8/8/8 w - - 0 1)
Larsen, Karl Adolf Koefoed
1st Prize, Good Companions (April Complete Blocks), 1921
#2
9 + 6
| 3132 | The Good Companion Two-Mover | 1922 |
| 5862 | An ABC of Chess Problems | 1970 |
| 4640 | Chess Wizardry: The New ABC of Chess Problems | 1996 |
SOLUTION
- SOUND
- Sets
- 1...Bxb7
- 2.Qxd7#
- 1...d6+
- 2.cxd6#
- 1...e6
- 2.Qc6#
- 1...Bxb7
- Tries
- 1.Kd4?
- 1...Bxb7
- 2.Qxd7#
- 1...d6
- 2.Qc6#
- 2.cxd6#
- 1...e6
- 2.Qc6#
- 1...e5+!
- 1...Bxb7
- 1.Ke4?
- 1...d6
- 2.Qc6#
- 2.cxd6#
- 1...e5
- 2.Qc6#
- 1...e6
- 2.Qc6#
- 1...Bxb7!
- 1...d6
- 1.Kf4?
- 1...Bxb7
- 2.Qxd7#
- 1...d6
- 2.Qc6#
- 2.cxd6#
- 1...e6
- 2.Qc6#
- 1...e5+!
- 1...Bxb7
- 1.Sb2?
- 1...Bxb7
- 2.Qxd7#
- 1...e6
- 2.Qc6#
- 1...d6+!
- 1...Bxb7
- 1.Sc3?
- 1...Bxb7
- 2.Qxd7#
- 1...e6
- 2.Qc6#
- 1...d6+!
- 1...Bxb7
- 1.Sb6?
- threat
- 2.Rxc8#
- 1...Bxb7
- 2.Qxd7#
- 1...d6+!
- threat
- 1.Sa5?
- 1...d6+
- 2.Qxd6#
- 1...Kd8
- 2.Qxd7#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxb7#
- 2.Qxd7#
- 1...e6!
- 1...d6+
- 1.Sd6?
- threat
- 2.Rxc8#
- 1...Kd8
- 2.Rxc8#
- 1...Ba6
- 2.Se8#
- 1...Bb7
- 2.Se8#
- 2.Qxb7#
- 1...exd6+!
- threat
- 1.Ba6?
- 1...d6+
- 2.Qxd6#
- 1...Bxb7
- 2.Qxb7#
- 1...e6!
- 1...d6+
- 1.Rxe7?
- threat
- 2.Qc6#
- 1...Bxb7
- 2.Rxd7#
- 2.Qd6#
- 2.Qxd7#
- 1...Bxe7!
- threat
- 1.Rxg7?
- 1...d6+
- 2.cxd6#
- 1...Bxb7
- 2.Qxd7#
- 1...e6
- 2.Qc6#
- 1...Bxg7+!
- 1...d6+
- 1.Rxf8?
- threat
- 2.Raxc8#
- 2.Rfxc8#
- 1...Bxb7
- 2.Qxd7#
- 1...d6+!
- threat
- 1.Qh1?
- 1...d6+
- 2.cxd6#
- 1...d5
- 2.cxd5 ep#
- 1...e6
- 2.Qc6#
- 1...Bxb7!
- 1...d6+
- 1.Qg2?
- 1...d6+
- 2.cxd6#
- 1...d5
- 2.cxd5 ep#
- 1...e6
- 2.Qc6#
- 1...Bxb7!
- 1...d6+
- 1.Qf3?
- 1...d6+
- 2.cxd6#
- 1...d5
- 2.cxd5 ep#
- 1...e6
- 2.Qc6#
- 1...Bxb7!
- 1...d6+
- 1.Qe4?
- 1...d6+
- 2.cxd6#
- 1...d5
- 2.cxd5 ep#
- 1...e6
- 2.Qc6#
- 1...Bxb7!
- 1...d6+
- 1.Qd6+?
- 1...Kxb7
- 2.Qb8#
- 1...exd6+!
- 1...Kxb7
- 1.c6?
- 1...d6+
- 2.Qxd6#
- 1...Bxb7
- 2.Qxd7#
- 1...dxc6
- 2.Qxc6#
- 1...e6!
- 1...d6+
- 1.Kd4?
- Keys
- 1.Sd8!
- 1...d6+
- 2.Qxd6#
- 1...Kxd8
- 2.Qxd7#
- 1...Ba6
- 2.Qxd7#
- 1...Bb7
- 2.Qxb7#
- 2.Qxd7#
- 1...e6
- 2.Sxe6#
- 1...d6+
- 1.Sd8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Tries
- Try
- K(E);S_FLIGHT
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- P(c);CHECK,P_SPINP(b)
- Try
- K(E);P-FLIGHT
- Vars
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(e);P_PINQ(D),XS(G)
- Try
- K(E);S_FLIGHT
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- P(c);CHECK,P_SPINP(b)
- Try
- S(A);
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- P(b);CHECK,P_SPINP(c)
- Try
- S(A);
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- P(b);CHECK,P_SPINP(c)
- Try
- S(A);
- Threat
- R1(I),XB(e)
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- Refutation
- P(b);CHECK,P_SPINP(c)
- Try
- S(G);
- Vars
- P(b);CHECK,P_SPINP(c)::QAB1(D),XP(b)
- K(a);P_SPINB(e),P_SPINP(b),S_FLIGHT::QAR1(D),XP(b)
- B(e);N_GUARD::QAR1(D),XP(b)
- Refutation
- P(c);P_SPINP(b)
- Try
- S(G);
- Threat
- R1(I),XB(e)
- Vars
- K(a);P_SPINB(e),S_FLIGHT::R1(I),XB(e)
- B(e);::S(G)
- Refutation
- P(c);CHECK,P_SPINP(b),XS(G)
- Try
- B(B);
- Vars
- P(b);CHECK,P_SPINP(c)::QAB1(D),XP(b)
- B(e);OGATE,XS(G)::QAR1(D),XB(e)
- Refutation
- P(c);P_SPINP(b)
- Try
- R(H);P_PINP(b),XP(c)
- Threat
- QAR1(D)
- Refutation
- B(f);N_SPINP(b),XR(H)
- Try
- R(H);XP(d)
- Vars
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(f);CHECK,XR(H)
- Try
- R(H);XB(f)
- Threat
- DUALS(2)
- Vars
- B(e);N_GUARD,SBLOCK,XS(G)::QAR1(D),XP(b)
- Refutation
- P(b);CHECK
- Try
- Q(D);
- Vars
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- P(b);OGATE,P_SPINP(c)::P(C),XP(b),EP
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(e);XS(G)
- Try
- Q(D);
- Vars
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- P(b);OGATE,P_SPINP(c)::P(C),XP(b),EP
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(e);XS(G)
- Try
- Q(D);
- Vars
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- P(b);OGATE,P_SPINP(c)::P(C),XP(b),EP
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(e);XS(G)
- Try
- Q(D);
- Vars
- P(b);CHECK,OGATE,P_SPINP(c)::P(C),XP(b)
- P(b);OGATE,P_SPINP(c)::P(C),XP(b),EP
- P(c);P_SPINP(b)::QAR1(D)
- Refutation
- B(e);XS(G)
- Try
- Q(D);CHECK
- Vars
- K(a);OGATE,P-FLIGHT,XS(G)::QAR1(D)
- Refutation
- P(c);CHECK,P_SPINP(b),XQ(D)
- Try
- P(C);
- Vars
- P(b);CHECK,P_SPINP(c)::QAB1(D),XP(b)
- B(e);N_GUARD,XS(G)::QAR1(D),XP(b)
- P(b);OGATE,P_SPINP(c),XP(C)::QAR1(D),XP(b)
- Refutation
- P(c);P_SPINP(b)
- Try
- Actual
- S(G);
- Vars
- P(b);CHECK,P_SPINP(c)::QAB1(D),XP(b)
- K(a);P_SPINB(e),P_SPINP(b),S_FLIGHT,XS(G)::QAR1(D),XP(b)
- B(e);N_GUARD::QAR1(D),XP(b)
- P(c);P_SPINP(b)::S(G),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).