MESON Chess Problem Database
Problem Display
PID: 204267 (3Q4/qk1N3K/8/1P1N4/8/8/8/8 w - - 0 1)
Lazard, Frederic
La Strategie, 1925
#2
5 + 2
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8
- 2.Qc7#
- 1...Qg1
- Tries
- 1.Sc3?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Se3?
- 1...Qxe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qxe3
- 1.Sb4?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Sf4?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.S5b6?
- threat
- 2.Sc5#
- 2.Qc8#
- 1...Qxb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- threat
- 1.S5f6?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Sc7?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Qe8?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Qf8?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Qg8?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Qh8?
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8!
- 1...Qg1
- 1.Sc3?
- Keys
- 1.Se7!
- threat
- 2.Qc8#
- 1...Qg1
- 2.Qb8#
- 1...Qf2
- 2.Qb8#
- 1...Qe3
- 2.Qb8#
- 1...Qd4
- 2.Qb8#
- 1...Qc5
- 2.Qb8#
- 1...Qb6
- 2.Qb8#
- 1...Qb8
- 2.Qxb8#
- 1...Qa1
- 2.Qb8#
- 1...Qa2
- 2.Qb8#
- 1...Qa3
- 2.Qb8#
- 1...Qa4
- 2.Qb8#
- 1...Qa5
- 2.Qb8#
- 1...Qa6
- 2.Qb8#
- 1...Qa8
- 2.Qb6#
- threat
- 1.Se7!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Q(a);SBLOCK::QAR1(E)
- Tries
- Try
- S(B);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- S(B);
- Vars
- Q(a);N_GUARD,XS(B)::QAR1(E)
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- S(B);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- S(B);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- S(B);
- Threat
- DUALS(2)
- Vars
- Q(a);N_GUARD,XS(B)::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Q(a);N_GUARD::QAR1(E)
- Refutation
- Q(a);
- Try
- S(B);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- S(B);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- Q(E);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- Q(E);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- Q(E);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- Q(E);
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Refutation
- Q(a);
- Try
- Actual
- S(B);
- Threat
- QAB1(E)
- Vars
- Q(a);N_GUARD::QAR1(E)
- Q(a);N_GUARD::QAR1(E),XQ(a)
- Q(a);N_GUARD,SBLOCK::QAR1(E)
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).