MESON Chess Problem Database
Problem Display
PID: 10645 (4B1n1/1pq3p1/1R2Np2/p4k2/3B4/1P3P2/K1p3p1/2Q5 w - - 0 1)
Keller, Michael
2nd Prize, Schweizerische Arbeiter Schachzeitung, 1966
#2
8 + 9
| 4655 | Michael Keller Ein Meister der Schachkomposition | 1994 |
SOLUTION
- SOUND
- Sets
- 1...Qh2
- 2.Sxg7#
- 2.Qxc2#
- 1...Qg3
- 2.Qxc2#
- 1...Qf4
- 2.Qxf4#
- 1...Qe5
- 2.Sxg7#
- 1...Qxb6
- 2.Sxg7#
- 1...Qd6
- 2.Sxg7#
- 1...Qb8
- 2.Sxg7#
- 2.Qxc2#
- 1...Qd8
- 2.Sxg7#
- 2.Qf4#
- 2.Qxc2#
- 1...Qc3
- 2.Sxg7#
- 2.Qf4#
- 1...Qc4
- 2.Sxg7#
- 2.Qf4#
- 1...Qc5
- 2.Sxg7#
- 2.Qf4#
- 1...Qc6
- 2.Sxg7#
- 1...Qd7
- 2.Qf4#
- 2.Qxc2#
- 1...Qe7
- 2.Qf4#
- 2.Qxc2#
- 1...Qf7
- 2.Qxc2#
- 1...Qc8
- 2.Sxg7#
- 2.Qf4#
- 1...Se7
- 2.Sxg7#
- 1...Qh2
- Tries
- 1.Rb5+?
- 1...Qe5
- 2.Sxg7#
- 1...Qc5
- 2.Sxg7#
- 1...Kxe6!
- 1...Qe5
- 1.Rc6?
- threat
- 2.Qxc2#
- 1...Qxc6
- 2.Sxg7#
- 1...Qd6
- 2.Sxg7#
- 1...Qf4
- 2.Qxf4#
- 1...Qe5
- 2.Sxg7#
- 1...bxc6!
- threat
- 1.Rd6?
- threat
- 2.Qf4#
- 1...Qxd6
- 2.Sxg7#
- 1...Qf7
- 2.Qxc2#
- 1...g5!
- threat
- 1.Qd2?
- threat
- 2.Qd3#
- 1...Qxb6
- 2.Sxg7#
- 1...Qd6
- 2.Sxg7#
- 1...Qc6
- 2.Sxg7#
- 1...Qf4
- 2.Qxf4#
- 1...Qe5
- 2.Sxg7#
- 1...Qc3
- 2.Sxg7#
- 2.Qf4#
- 1...Qc4
- 2.Sxg7#
- 2.Qf4#
- 1...c1S+!
- threat
- 1.Qe3?
- threat
- 2.Qd3#
- 2.Qe4#
- 1...Qxb6
- 2.Sxg7#
- 2.Qe4#
- 1...Qf4
- 2.Qxf4#
- 1...Qe5
- 2.Sxg7#
- 1...Qd6
- 2.Sxg7#
- 2.Qe4#
- 1...Qc3
- 2.Sxg7#
- 2.Qf4#
- 2.Qe4#
- 1...Qc4
- 2.Sxg7#
- 2.Qf4#
- 2.Qe4#
- 1...Qc6
- 2.Sxg7#
- 1...c1S+!
- threat
- 1.Rb5+?
- Keys
- 1.Bc3!
- threat
- 2.Qxc2#
- 1...Qxb6
- 2.Sxg7#
- 1...Qxc3
- 2.Qf4#
- 1...Qd6
- 2.Sxg7#
- 1...Qc6
- 2.Sxg7#
- 1...Qf4
- 2.Qxf4#
- 1...Qe5
- 2.Sxg7#
- 1...Qd8
- 2.Sxg7#
- 2.Qf4#
- 1...Qc4
- 2.Sxg7#
- 1...Qd7
- 2.Qf4#
- threat
- 1.Bc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 3
- Sets
- Q(g);N_GUARD::QAB(A),XP(a)
- Q(g);N_GUARD::QAR1(A),XQ(g)
- Q(g);N_GUARD::S(G),XP(h)
- Q(g);N_GUARD,XR(F)::S(G),XP(h)
- S(i);S_CUTQ(g)::S(G),XP(h)
- Tries
- Try
- R(F);CHECK
- Vars
- Q(g);P_SPINQ(g)::S(G),XP(h)
- Refutation
- K(d);S_FLIGHT,XS(G)
- Try
- R(F);
- Threat
- QAB(A),XP(a)
- Vars
- Q(g);N_GUARD,XR(F)::S(G),XP(h)
- Q(g);N_GUARD::S(G),XP(h)
- Q(g);N_GUARD::QAR1(A),XQ(g)
- Refutation
- P(f);XR(F)
- Try
- R(F);
- Threat
- QAR1(A)
- Vars
- Q(g);N_GUARD,XR(F)::S(G),XP(h)
- Q(g);N_GUARD::QAB(A),XP(a)
- Refutation
- P(h);
- Try
- Q(A);
- Threat
- QAB(A)
- Vars
- Q(g);N_GUARD,XR(F)::S(G),XP(h)
- Q(g);N_GUARD::S(G),XP(h)
- Q(g);N_GUARD::QAR1(A),XQ(g)
- Refutation
- P(a);CHECK
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD::QAR1(A),XQ(g)
- Q(g);N_GUARD::S(G),XP(h)
- Refutation
- P(a);CHECK
- Try
- Actual
- B(E);
- Threat
- QAB(A),XP(a)
- Vars
- Q(g);N_GUARD,XR(F)::S(G),XP(h)
- Q(g);N_GUARD,XB(E)::QAR1(A)
- Q(g);N_GUARD::S(G),XP(h)
- Q(g);N_GUARD::QAR1(A),XQ(g)
- Q(g);N_GUARD,P_PINP(C)::S(G),XP(h)
- Q(g);N_GUARD::QAR1(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).