MESON Chess Problem Database
Problem Display
PID: 15117 (2n1K3/1qBN2P1/1p2R3/3kpP2/r2p1Qr1/3B2b1/4bN2/8 w - - 0 1)
Keller, Michael
1st Prize, Arbeiter Zeitung, 1980
#2
9 + 10
| 4655 | Michael Keller Ein Meister der Schachkomposition | 1994 |
SOLUTION
- SOUND
- Sets
- 1...Qc6
- 2.Rxe5#
- 1...Rc4
- 2.Be4#
- 1...Rg5
- 2.Qe4#
- 1...Rg6
- 2.Qe4#
- 1...Rxg7
- 2.Qe4#
- 1...Bxf2
- 2.Qxe5#
- 1...Bh4
- 2.Qxe5#
- 1...Sd6+
- 2.Rxd6#
- 1...Sa7
- 2.Rd6#
- 1...Se7
- 2.Rd6#
- 1...Qc6
- Tries
- 1.Sxg4?
- threat
- 2.Sgf6#
- 2.Qe4#
- 1...Sd6+
- 2.Rxd6#
- 1...Bxg4
- 2.Qe4#
- 1...Bxf4
- 2.Sgf6#
- 1...exf4
- 2.Sgf6#
- 1...Bf3
- 2.Sgf6#
- 1...Bh4
- 2.Qxe5#
- 2.Qe4#
- 1...e4
- 2.Sgf6#
- 2.Qxe4#
- 1...Bxd3!
- threat
- 1.Rg6?
- threat
- 2.g8Q#
- 2.g8B#
- 1...Sd6+
- 2.Rxd6#
- 1...Qxc7
- 2.g8Q#
- 2.g8B#
- 1...Rxf4
- 2.g8Q#
- 2.g8B#
- 1...Rxg6
- 2.Qe4#
- 1...Bxd3
- 2.g8Q#
- 2.g8B#
- 1...Bxf2
- 2.Qxe5#
- 2.g8Q#
- 2.g8B#
- 1...Bxf4
- 2.g8Q#
- 2.g8B#
- 1...exf4
- 2.g8Q#
- 2.g8B#
- 1...Qa6
- 2.g8Q#
- 2.g8B#
- 1...Qa8
- 2.g8Q#
- 2.g8B#
- 1...Qa7
- 2.g8Q#
- 2.g8B#
- 1...Qb8
- 2.g8Q#
- 2.g8B#
- 1...Ra1
- 2.g8Q#
- 2.g8B#
- 1...Ra2
- 2.g8Q#
- 2.g8B#
- 1...Ra3
- 2.g8Q#
- 2.g8B#
- 1...Rb4
- 2.g8Q#
- 2.g8B#
- 1...Rc4
- 2.Be4#
- 2.g8Q#
- 2.g8B#
- 1...Ra5
- 2.g8Q#
- 2.g8B#
- 1...Ra6
- 2.g8Q#
- 2.g8B#
- 1...Ra7
- 2.g8Q#
- 2.g8B#
- 1...Ra8
- 2.g8Q#
- 2.g8B#
- 1...Rh4
- 2.g8Q#
- 2.g8B#
- 1...Rg5
- 2.Qe4#
- 2.g8Q#
- 2.g8B#
- 1...Bd1
- 2.g8Q#
- 2.g8B#
- 1...Bf1
- 2.g8Q#
- 2.g8B#
- 1...Bf3
- 2.g8Q#
- 2.g8B#
- 1...Bh2
- 2.g8Q#
- 2.g8B#
- 1...Bh4
- 2.Qxe5#
- 2.g8Q#
- 2.g8B#
- 1...Sa7
- 2.Rd6#
- 2.g8Q#
- 2.g8B#
- 1...Se7
- 2.Rd6#
- 1...e4
- 2.g8Q#
- 2.g8B#
- 1...b5
- 2.g8Q#
- 2.g8B#
- 1...Qc6!
- threat
- 1.g8Q?
- threat
- 2.Rd6#
- 2.Rg6#
- 1...Sd6+
- 2.Rxd6#
- 1...Qxc7
- 2.Rg6#
- 1...Qc6
- 2.Rxe5#
- 2.Rd6#
- 1...Rg6
- 2.Rd6#
- 2.Rxg6#
- 2.Qe4#
- 1...Rg7
- 2.Rd6#
- 2.Qe4#
- 1...Se7
- 2.Rd6#
- 1...Rxg8+!
- threat
- 1.g8B?
- threat
- 2.Rd6#
- 2.Rg6#
- 1...Sd6+
- 2.Rxd6#
- 1...Qxc7
- 2.Rg6#
- 1...Qc6
- 2.Rxe5#
- 2.Rd6#
- 1...Rg6
- 2.Rd6#
- 2.Rxg6#
- 2.Qe4#
- 1...Rg7
- 2.Rd6#
- 2.Qe4#
- 1...Se7
- 2.Rd6#
- 1...Rxg8+!
- threat
- 1.Sxg4?
- Keys
- 1.Qc1!
- threat
- 2.Sf6#
- 1...Sd6+
- 2.Rxd6#
- 1...Qc6
- 2.Qxc6#
- 1...Rc4
- 2.Qxc4#
- 1...Rg6
- 2.Be4#
- 1...Bh4
- 2.Rxe5#
- threat
- 1.Qc1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 5
- Sets
- Q(i);P_PINS(G),SBLOCK::R1(E),XP(g)
- R(c);SBLOCK::B(B)
- R(e);N_GUARD::QAB1(C)
- R(e);N_GUARD,XP(H)::QAB1(C)
- B(b);N_GUARD,XS(A)::QAR1(C),XP(g)
- B(b);N_GUARD::QAR1(C),XP(g)
- S(j);CHECK,N_GUARD::R1(E),XS(j)
- S(j);N_GUARD::R1(E)
- Tries
- Try
- S(A);XR(e)
- Threat
- DUALS(2)
- Vars
- S(j);CHECK,N_GUARD::R1(E),XS(j)
- B(a);XS(A)::QAB1(C)
- B(b);XQ(C)::S(A)
- P(g);XQ(C)::S(A)
- B(a);::S(A)
- Refutation
- B(a);XB(B)
- Try
- R(E);
- Threat
- P=Q
- Vars
- S(j);CHECK,N_GUARD::R1(E),XS(j)
- Q(i);XB(F)::P=Q
- R(e);XQ(C)::P=Q
- R(e);N_GUARD,XR(E)::QAB1(C)
- B(a);XB(B)::P=Q
- B(b);XQ(C)::P=Q
- P(g);XQ(C)::P=Q
- Q(i);::P=Q
- R(c);::P=Q
- R(e);::P=Q
- B(a);::P=Q
- B(b);::P=Q
- S(j);N_GUARD::R1(E)
- P(g);::P=Q
- P(h);::P=Q
- Refutation
- Q(i);P_PINS(G)
- Try
- P(H);
- Threat
- DUALS(2)
- Vars
- S(j);CHECK::QAB(H)+R(E),DCHECK,XS(j)
- Q(i);XB(F)::QAB(H)+R(E)
- S(j);::QAB(H)+R(E),DCHECK
- Refutation
- R(e);CHECK,XQ(H)
- Try
- P(H);
- Threat
- DUALS(2)
- Vars
- S(j);CHECK::B(H)+R(E),DCHECK,XS(j)
- Q(i);XB(F)::B(H)+R(E)
- S(j);::B(H)+R(E),DCHECK
- Refutation
- R(e);CHECK,XB(H)
- Try
- Actual
- Q(C);
- Threat
- S(G)
- Vars
- S(j);CHECK,N_GUARD::R1(E),XS(j)
- Q(i);N_GUARD,P_PINS(G)::QAB1(C),XQ(i)
- R(c);N_GUARD::QAB1(C),XR(c)
- R(e);N_GUARD::B(B)
- B(b);N_GUARD::R1(E),XP(g)
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).