MESON Chess Problem Database
Problem Display
PID: 15939 (1Q2n3/q6p/p3N3/b1P1N1Rr/4kBPp/r2p1p2/B2P1p2/2n2K2 w - - 0 1)
Keller, Michael
1st Prize, Schach-Echo, 1989
#2
10 + 13
| 4655 | Michael Keller Ein Meister der Schachkomposition | 1994 |
SOLUTION
- SOUND
- Sets
- 1...Qb7
- 2.Qxb7#
- 1...Qa8
- 2.Qxa8#
- 1...Bb4
- 2.Qxb4#
- 1...Bc7
- 2.Qb4#
- 1...Bd8
- 2.Qb4#
- 1...Qb7
- Tries
- 1.Sc6?
- threat
- 2.Bd5#
- 2.Qe5#
- 1...Qxc5
- 2.Sxc5#
- 1...Qxb8
- 2.Bd5#
- 1...Rxa2
- 2.Qe5#
- 1...Rxg5
- 2.Sxg5#
- 1...Sxa2
- 2.Qe5#
- 1...Qc7
- 2.Bd5#
- 1...Qd7
- 2.Qe5#
- 1...Qg7
- 2.Bd5#
- 1...Rb3
- 2.Qe5#
- 1...Bc3
- 2.Bd5#
- 1...Bc7
- 2.Bd5#
- 2.Qb4#
- 1...Sb3
- 2.Qe5#
- 1...Sd6
- 2.Bd5#
- 1...Sf6
- 2.Qe5#
- 1...Sc7!
- threat
- 1.Sd7?
- threat
- 2.Bd5#
- 2.Qe5#
- 1...Qxc5
- 2.Sdxc5#
- 1...Qxb8
- 2.Bd5#
- 1...Qxd7
- 2.Qe5#
- 1...Rxa2
- 2.Qe5#
- 1...Sxa2
- 2.Qe5#
- 1...Qb7
- 2.Qe5#
- 2.Qxb7#
- 1...Qc7
- 2.Bd5#
- 1...Qa8
- 2.Qe5#
- 2.Qxa8#
- 1...Rb3
- 2.Qe5#
- 1...Bc3
- 2.Bd5#
- 1...Bc7
- 2.Bd5#
- 2.Qb4#
- 1...Sb3
- 2.Qe5#
- 1...Sd6
- 2.Sf6#
- 2.Bd5#
- 1...Sf6
- 2.Sxf6#
- 2.Qe5#
- 1...Sc7
- 2.Sf6#
- 1...Rxg5!
- threat
- 1.Sf7?
- threat
- 2.Bd5#
- 2.Qe5#
- 1...Qxb8
- 2.Bd5#
- 1...Rxa2
- 2.Qe5#
- 1...Rxg5
- 2.Sfxg5#
- 1...Sxa2
- 2.Qe5#
- 1...Qb7
- 2.Qe5#
- 2.Qxb7#
- 1...Qc7
- 2.Bd5#
- 1...Qd7
- 2.Qe5#
- 1...Qa8
- 2.Qe5#
- 2.Qxa8#
- 1...Rb3
- 2.Qe5#
- 1...Bc3
- 2.Bd5#
- 1...Bc7
- 2.Bd5#
- 2.Qb4#
- 1...Sb3
- 2.Qe5#
- 1...Sd6
- 2.Sxd6#
- 2.Bd5#
- 1...Sf6
- 2.Sd6#
- 2.Qe5#
- 1...Sc7
- 2.Sd6#
- 1...Qxc5!
- threat
- 1.Qa8+?
- 1...Qb7
- 2.Qxb7#
- 1...Qxa8!
- 1...Qb7
- 1.Sc6?
- Keys
- 1.Sxd3!
- threat
- 2.Sxf2#
- 1...Kxd3
- 2.Qb1#
- 1...Qxc5
- 2.Sdxc5#
- 1...Rxd3
- 2.Qe5#
- 1...Sxd3
- 2.Bd5#
- threat
- 1.Sxd3!
This is a version
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 5
- Sets
- Q(k);N_GUARD::QAB(J),XQ(k)
- B(h);N_GUARD::QAR(J),XB(h)
- B(h);N_GUARD::QAR(J)
- Tries
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(k);XP(F)::S(I),XQ(k)
- Q(k);XQ(J)::B(B)
- R(c);XB(B)::QAR1(J)
- R(i);XR(H)::S(I),XR(i)
- S(a);XB(B)::QAR1(J)
- Q(k);::B(B)
- Q(k);::QAR1(J)
- R(c);::QAR1(J)
- B(h);::B(B)
- S(a);::QAR1(J)
- S(m);::B(B)
- S(m);::QAR1(J)
- Refutation
- S(m);
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(k);XP(F)::S(G),XQ(k)
- Q(k);XQ(J)::B(B)
- Q(k);XS(G)::QAR1(J)
- R(c);XB(B)::QAR1(J)
- S(a);XB(B)::QAR1(J)
- Q(k);::B(B)
- R(c);::QAR1(J)
- B(h);::B(B)
- S(a);::QAR1(J)
- S(m);N_GUARD::S(G)
- Refutation
- R(i);XR(H)
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(k);XQ(J)::B(B)
- R(c);XB(B)::QAR1(J)
- R(i);XR(H)::S(G),XR(i)
- S(a);XB(B)::QAR1(J)
- Q(k);::B(B)
- Q(k);::QAR1(J)
- R(c);::QAR1(J)
- B(h);::B(B)
- S(a);::QAR1(J)
- S(m);N_GUARD::S(G)
- Refutation
- Q(k);XP(F)
- Try
- Q(J);CHECK
- Vars
- Q(k);N_GUARD,P_SPINQ(k)::QAB(J),XQ(k)
- Refutation
- Q(k);XQ(J)
- Try
- Actual
- S(G);XP(d)
- Threat
- S(G),XP(b)
- Vars
- K(f);OGATEB,S_FLIGHT,XS(G)::QAB(J)
- Q(k);XP(F)::S(G),XQ(k)
- R(c);SBLOCK,XS(G)::QAR1(J)
- S(a);SBLOCK,XS(G)::B(B)
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).