MESON Chess Problem Database
Problem Display
PID: 100894 (8/4K3/8/4k1n1/2QNn1R1/8/8/7B w - - 0 1)
van Dijk, Johannes
Good Companions, 1921
#2
5 + 3
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc3
- 2.Qc7#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc5
- 2.Qd5#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qc5#
- 1...Sf6
- 2.Qc7#
- 1...Sh3
- 2.Rxe4#
- 1...Se6
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sh7
- 2.Rxe4#
- 1...Sd2
- Tries
- 1.Sc2?
- 1...Sd2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Rxg5#
- 2.Qf4#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Rxg5#
- 2.Qf4#
- 1...Sf3
- 2.Qe6#
- 2.Qxe4#
- 1...Sh3
- 2.Qe6#
- 2.Qxe4#
- 1...Se6
- 2.Qxe6#
- 2.Qxe4#
- 1...Sf7
- 2.Qe6#
- 2.Qxe4#
- 1...Sh7
- 2.Qe6#
- 2.Qxe4#
- 1...Kf5!
- 1...Sd2
- 1.Se2?
- 1...Sd2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Rxg5#
- 2.Qf4#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Rxg5#
- 2.Qf4#
- 1...Sf3
- 2.Qe6#
- 2.Qxe4#
- 1...Sh3
- 2.Qe6#
- 2.Qxe4#
- 1...Se6
- 2.Qxe6#
- 2.Qxe4#
- 1...Sf7
- 2.Qe6#
- 2.Qxe4#
- 1...Sh7
- 2.Qe6#
- 2.Qxe4#
- 1...Kf5!
- 1...Sd2
- 1.Sb3?
- 1...Sd2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Rxg5#
- 2.Qf4#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Rxg5#
- 2.Qf4#
- 1...Sf3
- 2.Qe6#
- 2.Qxe4#
- 1...Sh3
- 2.Qe6#
- 2.Qxe4#
- 1...Se6
- 2.Qxe6#
- 2.Qxe4#
- 1...Sf7
- 2.Qe6#
- 2.Qxe4#
- 1...Sh7
- 2.Qe6#
- 2.Qxe4#
- 1...Kf5!
- 1...Sd2
- 1.Sf3+?
- 1...Sxf3
- 2.Qxe4#
- 1...Kf5!
- 1...Sxf3
- 1.Sb5?
- 1...Sd2
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Rxg5#
- 2.Qf4#
- 1...Sg3
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Rxg5#
- 2.Qf4#
- 1...Sf3
- 2.Qe6#
- 2.Qxe4#
- 1...Sh3
- 2.Qe6#
- 2.Qxe4#
- 1...Se6
- 2.Qxe6#
- 2.Qxe4#
- 1...Sf7
- 2.Qe6#
- 2.Qxe4#
- 1...Sh7
- 2.Qe6#
- 2.Qxe4#
- 1...Kf5!
- 1...Sd2
- 1.Sf5?
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Qf4#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Qf4#
- 1...Sf3
- 2.Qe6#
- 2.Qxe4#
- 1...Sh3
- 2.Qe6#
- 2.Qxe4#
- 1...Se6
- 2.Qxe6#
- 2.Qxe4#
- 1...Sf7
- 2.Qe6#
- 2.Qxe4#
- 1...Sh7
- 2.Qe6#
- 2.Qxe4#
- 1...Kxf5!
- 1...Sd2
- 1.Se6?
- 1...Sxe6
- 2.Qxe4#
- 1...Sd2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf2
- 2.Rxg5#
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc3
- 2.Rxg5#
- 2.Qf4#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sc5
- 2.Rxg5#
- 2.Qd5#
- 2.Qf4#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qf4#
- 2.Qc5#
- 1...Sf6
- 2.Rxg5#
- 2.Qf4#
- 1...Sf3
- 2.Qxe4#
- 1...Sh3
- 2.Qxe4#
- 1...Sf7
- 2.Qxe4#
- 1...Sh7
- 2.Qxe4#
- 1...Kf5!
- 1...Sxe6
- 1.Bg2?
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc3
- 2.Qc7#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc5
- 2.Qd5#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qc5#
- 1...Sf6
- 2.Qc7#
- 1...Sh3
- 2.Rxe4#
- 1...Se6
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sh7
- 2.Rxe4#
- 1...Sf3!
- 1...Sd2
- 1.Bf3?
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc3
- 2.Qc7#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc5
- 2.Qd5#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qc5#
- 1...Sf6
- 2.Qc7#
- 1...Sh3
- 2.Rxe4#
- 1...Se6
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sh7
- 2.Rxe4#
- 1...Sxf3!
- 1...Sd2
- 1.Bxe4?
- threat
- 2.Sc6#
- 2.Qd5#
- 2.Qc5#
- 1...Se6
- 2.Sf3#
- 2.Sc6#
- 2.Qd5#
- 1...Sxe4!
- threat
- 1.Rf4?
- threat
- 2.Rf5#
- 1...Sg3
- 2.Sc6#
- 2.Qc7#
- 1...Sd6
- 2.Sc6#
- 1...Kxf4!
- threat
- 1.Rh4?
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc3
- 2.Qc7#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qc7#
- 1...Sc5
- 2.Qd5#
- 2.Qxc5#
- 1...Sd6
- 2.Qd5#
- 2.Qc5#
- 1...Sf6
- 2.Qc7#
- 1...Sh3
- 2.Rxe4#
- 1...Se6
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sh7
- 2.Rxe4#
- 1...Sf3!
- 1...Sd2
- 1.Qb5+?
- 1...Sc5
- 2.Qxc5#
- 2.Qb8#
- 1...Kxd4!
- 1...Sc5
- 1.Qc6?
- 1...Sf3
- 2.Rxe4#
- 2.Qxe4#
- 1...Sd2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qd6#
- 2.Qf6#
- 2.Qc7#
- 1...Sf2
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qd6#
- 2.Qf6#
- 2.Qc7#
- 1...Sc3
- 2.Qd6#
- 2.Qf6#
- 2.Qc7#
- 1...Sg3
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qd6#
- 2.Qf6#
- 2.Qc7#
- 1...Sc5
- 2.Qd5#
- 2.Qxc5#
- 2.Qd6#
- 2.Qf6#
- 2.Qc7#
- 1...Sd6
- 2.Qd5#
- 2.Qc5#
- 2.Qxd6#
- 1...Sf6
- 2.Qd6#
- 2.Qxf6#
- 2.Qc7#
- 1...Sh3
- 2.Rxe4#
- 2.Qxe4#
- 1...Se6
- 2.Rxe4#
- 2.Qxe4#
- 1...Sf7
- 2.Rxe4#
- 2.Qxe4#
- 1...Sh7
- 2.Rxe4#
- 2.Qxe4#
- 1...Kxd4!
- 1...Sf3
- 1.Sc2?
- Keys
- 1.Qd3!
- 1...Kd5
- 2.Rxg5#
- 1...Sf3
- 2.Qxe4#
- 1...Sd2
- 2.Sc6#
- 2.Qb5#
- 2.Qf5#
- 2.Qg3#
- 1...Sf2
- 2.Sc6#
- 2.Qb5#
- 2.Qf5#
- 2.Qg3#
- 1...Sc3
- 2.Sc6#
- 2.Qf5#
- 2.Qg3#
- 1...Sg3
- 2.Sc6#
- 2.Qb5#
- 2.Qxg3#
- 1...Sc5
- 2.Sc6#
- 2.Qf5#
- 2.Qg3#
- 1...Sd6
- 2.Sc6#
- 2.Qg3#
- 1...Sf6
- 2.Sc6#
- 2.Qf5#
- 2.Qg3#
- 1...Sh3
- 2.Qxe4#
- 1...Se6
- 2.Qxe4#
- 1...Sf7
- 2.Qxe4#
- 1...Sh7
- 2.Qxe4#
- 1...Kd5
- 1.Qd3!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 4
- ADDED MATES = 2
- REMOVED MATES = 2
- Sets
- S(a);N_GUARD::QAB(B)
- S(c);N_GUARD::R1(D),XS(a)
- Tries
- Try
- S(C);
- Refutation
- K(b);P-FLIGHT
- Try
- S(C);
- Refutation
- K(b);P-FLIGHT
- Try
- S(C);
- Refutation
- K(b);P-FLIGHT
- Try
- S(C);CHECK
- Vars
- S(c);XS(C)::QAR1(B),XS(a)
- Refutation
- K(b);P-FLIGHT
- Try
- S(C);
- Refutation
- K(b);P-FLIGHT
- Try
- S(C);
- Vars
- S(a);OGATE::QAB1(B)
- Refutation
- K(b);P-FLIGHT,XS(C)
- Try
- S(C);
- Vars
- S(c);N_GUARD,XS(C)::QAR1(B),XS(a)
- S(c);N_GUARD::QAR1(B),XS(a)
- Refutation
- K(b);P-FLIGHT
- Try
- B(A);
- Vars
- S(a);N_GUARD::QAB(B)
- S(c);N_GUARD::R1(D),XS(a)
- Refutation
- S(c);
- Try
- B(A);
- Vars
- S(a);N_GUARD::QAB(B)
- S(c);N_GUARD::R1(D),XS(a)
- Refutation
- S(c);XB(A)
- Try
- B(A);XS(a)
- Threat
- DUALS(3)
- Refutation
- S(c);XB(A)
- Try
- R(D);
- Threat
- R1(D)
- Vars
- S(a);::S(C)
- Refutation
- K(b);S_FLIGHT,XR(D)
- Try
- R(D);
- Vars
- S(a);N_GUARD::QAB(B)
- S(c);N_GUARD::R1(D),XS(a)
- Refutation
- S(c);
- Try
- Q(B);CHECK
- Refutation
- K(b);P_SPINS(a),S_FLIGHT,XS(C)
- Try
- Q(B);
- Refutation
- K(b);P_SPINS(a),S_FLIGHT,XS(C)
- Try
- Actual
- Q(B);
- Vars
- K(b);P-FLIGHT,P_SPINS(a)::R(D),XS(c)
- S(c);N_GUARD::QAR1(B),XS(a)
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).