MESON Chess Problem Database
Problem Display
PID: 204290 (rBQ3B1/2n1R3/2p3p1/P1N3P1/P1rk3K/3P3p/2PP4/1q6 w - - 0 1)
Roscher, Willy
Arbeiter Schach Internationale, 1925
#2
12 + 8
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qa1
- 2.Sb3#
- 1...Qc1
- 2.Sb3#
- 1...Qd1
- 2.Sb3#
- 1...Qf1
- 2.Sb3#
- 1...Qg1
- 2.Sb3#
- 1...Qh1
- 2.Sb3#
- 1...Qb3
- 2.Sxb3#
- 1...Rxc5
- 2.Re4#
- 2.Qg4#
- 1...Sd5
- 2.Se6#
- 1...Qa1
- Tries
- 1.Qd7+?
- 1...Sd5
- 2.Se6#
- 1...Kxc5+!
- 1...Sd5
- 1.Qd8+?
- 1...Sd5
- 2.Se6#
- 1...Kxc5+!
- 1...Sd5
- 1.Qf8?
- threat
- 2.Re4#
- 2.Qf2#
- 1...Kxc5+
- 2.Re4#
- 1...Se6
- 2.Rd7#
- 1...Qf1
- 2.Sb3#
- 2.Re4#
- 1...Qg1
- 2.Sb3#
- 2.Re4#
- 1...Qh1
- 2.Sb3#
- 2.Qf2#
- 1...Sd5
- 2.Se6#
- 2.Re4#
- 1...Qe1+!
- threat
- 1.Qd7+?
- Keys
- 1.Re4+!
- 1...Kxc5
- 2.Qf8#
- 1...Kxc5
- 1.Re4+!
FEATURES
- Static
- TYPE = CHECKING_KEY
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 8
- Sets
- Q(a);N_GUARD::S(G)
- Q(a);N_GUARD::S(G),XQ(a)
- S(g);N_GUARD,SBLOCK::S(G)
- Tries
- Try
- Q(K);CHECK
- Vars
- S(g);P_SPINS(g)::S(G)
- Refutation
- K(d);CHECK,S_FLIGHT,XS(G)
- Try
- Q(K);CHECK
- Vars
- S(g);P_SPINS(g)::S(G)
- Refutation
- K(d);CHECK,S_FLIGHT,XS(G)
- Try
- Q(K);
- Threat
- DUALS(2)
- Vars
- K(d);CHECK,S_FLIGHT,XS(G)::QAB(K)+R(I)
- S(g);N_GUARD::R(I)
- Refutation
- Q(a);CHECK
- Try
- Actual
- R(I);CHECK
- Vars
- K(d);P_PINR(I),S_FLIGHT,XS(G)::QAB(K)
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).