MESON Chess Problem Database
Problem Display
PID: 15872 (6BK/1n5R/rQ5P/q1npB1Rr/2p1k1P1/4PNp1/3PP3/3N4 w - - 0 1)
Keller, Michael
1st Prize, Schach-Echo, 1987-1988
#2
13 + 9
| 4655 | Michael Keller Ein Meister der Schachkomposition | 1994 |
| 5159 | FIDE Album (1986-1988) (Annexe) | 1996 |
SOLUTION
- SOUND
- Sets
- 1...Qxd2
- 2.Sxd2#
- 1...Qc3
- 2.Sxc3#
- 1...Qxb6
- 2.Sc3#
- 1...Qa2
- 2.Sc3#
- 1...Qa4
- 2.Sc3#
- 1...Qb5
- 2.Sc3#
- 1...Ra7
- 2.Qg6#
- 1...Ra8
- 2.Qg6#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...g2
- 2.Sf2#
- 1...Qxd2
- Tries
- 1.Ba1?
- threat
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Qxa1+!
- threat
- 1.Bb2?
- threat
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 1...Sd7
- 2.Qd4#
- 1...d4
- 2.Bd5#
- 1...Se6!
- threat
- 1.Bxg3?
- threat
- 2.Sf2#
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sf2#
- 2.Sxg5#
- 1...Rh2
- 2.Bxd5#
- 2.Re5#
- 1...Ra8
- 2.Sf2#
- 2.Qg6#
- 1...Sb3
- 2.Sf2#
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Sf2#
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Sf2#
- 2.Qb1#
- 1...Sd7
- 2.Sf2#
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Sf2#
- 2.Bd5#
- 1...Qa1+!
- threat
- 1.Bd4?
- threat
- 2.Bxd5#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sa4
- 2.Re7#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qb1#
- 1...Sd3!
- threat
- 1.Bf4?
- threat
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Qa1+!
- threat
- 1.Bf6?
- threat
- 2.Bxd5#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Ra8!
- threat
- 1.Bc7?
- threat
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Qa1+!
- threat
- 1.Bg7?
- threat
- 2.Bxd5#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Sb3!
- threat
- 1.Bb8?
- threat
- 2.Bxd5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxd2
- 2.Sxd2#
- 1...Rxg5
- 2.Sxg5#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- 1...Qa1+!
- threat
- 1.Rf5?
- threat
- 2.Rf4#
- 1...Sd3
- 2.Qd4#
- 1...Se6
- 2.Qb1#
- 1...Rxf5!
- threat
- 1.Rf7?
- threat
- 2.Bh7#
- 2.Rf4#
- 1...Qxb6
- 2.Sc3#
- 2.Rf4#
- 1...Rxg5
- 2.Rf4#
- 1...Rxb6
- 2.Rf4#
- 1...d4
- 2.Rf4#
- 1...Ra8
- 2.Rf4#
- 2.Qg6#
- 1...Sd3
- 2.Bh7#
- 2.Qd4#
- 1...Se6
- 2.Bh7#
- 2.Qb1#
- 1...Sd6
- 2.Rf4#
- 1...Rxh6+!
- threat
- 1.Qxa5?
- threat
- 2.Sc3#
- 1...Sa4
- 2.Bxd5#
- 2.Qxd5#
- 1...c3
- 2.Sxc3#
- 1...d4!
- threat
- 1.Qxc5?
- threat
- 2.Bxd5#
- 2.Qd4#
- 1...Qxd2
- 2.Sxd2#
- 1...Qxc5
- 2.Sc3#
- 1...Ra8
- 2.Qd4#
- 1...Qc3
- 2.Sxc3#
- 2.Bxd5#
- 2.Qxd5#
- 1...Qb6
- 2.Sc3#
- 2.Bxd5#
- 2.Qxd5#
- 1...Qd8
- 2.Sc3#
- 2.Qd4#
- 1...Qa1
- 2.Bxd5#
- 2.Qxd5#
- 1...Rd6
- 2.Qd4#
- 1...Re6
- 2.Qd4#
- 1...d4
- 2.Bd5#
- 2.Qxd4#
- 1...Sxc5!
- threat
- 1.Qb2?
- threat
- 2.Qd4#
- 1...Qxd2
- 2.Sxd2#
- 1...Qc3
- 2.Sxc3#
- 1...Qa1
- 2.Sc3#
- 1...Sb3
- 2.Qb1#
- 2.Qc2#
- 1...Se6
- 2.Qb1#
- 2.Qc2#
- 1...d4
- 2.Qxd4#
- 1...c3!
- threat
- 1.Qf6?
- threat
- 2.Qf4#
- 2.Qf5#
- 1...Rxg5
- 2.Sxg5#
- 2.Qf4#
- 1...Sd3
- 2.Qf5#
- 1...Se6
- 2.Qf5#
- 2.Qg6#
- 1...Sd6
- 2.Qf4#
- 1...Rxf6!
- threat
- 1.d3+?
- 1...Sxd3
- 2.Qd4#
- 1...cxd3!
- 1...Sxd3
- 1.Ba1?
- Keys
- 1.Bc3!
- threat
- 2.Bxd5#
- 1...Qxc3+
- 2.Sxc3#
- 1...Rxg5
- 2.Sxg5#
- 1...Ra8
- 2.Qg6#
- 1...Sb3
- 2.Re7#
- 1...Sd3
- 2.Qd4#
- 1...Sa4
- 2.Re7#
- 2.Qd4#
- 2.Qb1#
- 1...Se6
- 2.Qb1#
- 1...Sd7
- 2.Qd4#
- 2.Qb1#
- 1...d4
- 2.Bd5#
- threat
- 1.Bc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 7
- Sets
- Q(d);XP(B)::S(E),XQ(d)
- Q(d);N_GUARD,P_PINB(G)::S(A),XQ(d)
- Q(d);N_GUARD,XQ(I)::S(A)
- Q(d);N_GUARD::S(A)
- R(h);N_GUARD::QAB(I)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(a);N_GUARD::S(A)
- Tries
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- Q(d);CHECK,XB(G)
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- P(f);::B(L)
- Refutation
- S(e);
- Try
- B(G);XP(a)
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- S(e);OGATE::QAR1(I)
- Refutation
- Q(d);CHECK
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);N_GUARD::QAB(I)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- Q(d);CHECK
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- R(h);P_PINB(L)
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- Q(d);CHECK
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,N_GUARD::S(A),XQ(d)
- Q(d);XP(B)::S(E),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
- Refutation
- Q(d);CHECK
- Try
- R(H);
- Threat
- R1(H)
- Vars
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- Refutation
- R(g);XR(H)
- Try
- R(K);P_SPINP(J)
- Threat
- DUALS(2)
- Vars
- R(g);N_PINP(J),XR(H)::R1(K)
- R(h);XQ(I)::R1(K)
- P(f);::R1(K)
- S(i);::R1(K)
- Refutation
- R(g);CHECK,XP(J)
- Try
- Q(I);XQ(d)
- Threat
- S(A)
- Vars
- P(b);::S(A),XP(b)
- Refutation
- P(f);
- Try
- Q(I);XS(e)
- Threat
- DUALS(2)
- Vars
- Q(d);XP(B)::S(E),XQ(d)
- Q(d);N_GUARD,XQ(I)::S(A)
- R(h);P_PINB(L)::QAR1(I)
- R(h);::QAR1(I)
- Refutation
- S(i);XQ(I)
- Try
- Q(I);
- Threat
- QAR1(I)
- Vars
- Q(d);XP(B)::S(E),XQ(d)
- Q(d);N_GUARD,P_PINB(G)::S(A),XQ(d)
- Q(d);N_GUARD::S(A)
- P(f);::QAR1(I),XP(f)
- Refutation
- P(b);
- Try
- Q(I);
- Threat
- DUALS(2)
- Vars
- S(e);::QAB1(I)
- S(i);::QAR1(I)
- Refutation
- R(h);XQ(I)
- Try
- P(B);CHECK
- Vars
- S(e);OGATE,XP(B)::QAR1(I)
- Refutation
- P(b);XP(B)
- Try
- Actual
- B(G);
- Threat
- B(L),XP(f)
- Vars
- Q(d);CHECK,XB(G)::S(A),XQ(d)
- R(g);XR(H)::S(E),XR(g)
- R(h);N_GUARD,P_PINB(L)::QAB(I)
- S(e);N_GUARD::R(K)
- S(e);OGATE::QAR1(I)
- S(e);N_GUARD::QAB(I)
- P(f);::B(L)
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).