MESON Chess Problem Database
Problem Display
PID: 233182 (2r2k1b/1R3Pq1/2P4B/Q1PN3B/n2N4/6R1/p1P5/Kb4n1 w - - 0 1)
Keller, Michael
Freie Presse, 1967
#2
12 + 8
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qxh6
- 2.Rg8#
- 1...Rxc6
- 2.Qd8#
- 1...Ra8
- 2.Qxa8#
- 1...Rb8
- 2.Rxb8#
- 1...Rd8
- 2.Qxd8#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Sb2
- 2.Se6#
- 1...Sc3
- 2.Se6#
- 1...Sxc5
- 2.Qxc5#
- 1...Qxh6
- Tries
- 1.Sc3?
- threat
- 2.Se6#
- 1...Qxh6
- 2.Rg8#
- 1...Rxc6
- 2.Qd8#
- 1...Sxc5
- 2.Qxc5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rc7!
- threat
- 1.Sf4?
- threat
- 2.Se6#
- 2.Sg6#
- 1...Qxh6
- 2.Rg8#
- 1...Rxc6
- 2.Qd8#
- 1...Bxc2
- 2.Se6#
- 1...Sxc5
- 2.Sg6#
- 2.Qxc5#
- 1...Re8
- 2.Sg6#
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rc7!
- threat
- 1.Sf6?
- threat
- 2.Se6#
- 2.Sh7#
- 1...Qxh6
- 2.Se6#
- 2.Rg8#
- 1...Rxc6
- 2.Sh7#
- 2.Qd8#
- 1...Bxc2
- 2.Se6#
- 1...Sxc5
- 2.Sh7#
- 2.Qxc5#
- 1...Re8
- 2.Sh7#
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rc7!
- threat
- 1.Rc3?
- threat
- 2.Se6#
- 1...Rxc6
- 2.Qd8#
- 1...Sxc5
- 2.Qxc5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Qxh6!
- threat
- 1.Rxg7?
- threat
- 2.Se6#
- 2.Rg8#
- 1...Rxc6
- 2.Rg8#
- 2.Qd8#
- 1...Sxc5
- 2.Rg8#
- 2.Qxc5#
- 1...Re8
- 2.Rg8#
- 2.fxe8Q#
- 2.fxe8R#
- 1...Bxg7!
- threat
- 1.Qe1?
- threat
- 2.Qe7#
- 1...Rc7
- 2.Qe8#
- 1...Re8
- 2.Qxe8#
- 2.fxe8Q#
- 2.fxe8R#
- 1...Se2!
- threat
- 1.Qc3?
- threat
- 2.Se6#
- 1...Qxh6
- 2.Rg8#
- 1...Sxc5
- 2.Qxc5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rxc6!
- threat
- 1.Qc7?
- threat
- 2.Qd6#
- 2.Qe7#
- 2.Qxc8#
- 1...Qxh6
- 2.Rg8#
- 2.Qe7#
- 2.Qxc8#
- 1...Ra8
- 2.Qd6#
- 2.Qe7#
- 1...Rb8
- 2.Rxb8#
- 2.Qd6#
- 2.Qxb8#
- 2.Qe7#
- 1...Rd8
- 2.Qxd8#
- 2.Qe7#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Sb6
- 2.Qd6#
- 2.Qe7#
- 1...Rxc7!
- threat
- 1.c3?
- threat
- 2.Se6#
- 1...Qxh6
- 2.Rg8#
- 1...Rxc6
- 2.Qd8#
- 1...Sxc5
- 2.Qxc5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- 1...Bf5!
- threat
- 1.Sc3?
- Keys
- 1.Rb2!
- threat
- 2.Se6#
- 1...Qxh6
- 2.Rg8#
- 1...Rxc6
- 2.Qd8#
- 1...Sxc5
- 2.Qxc5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8R#
- threat
- 1.Rb2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 5
- Sets
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- R(f);N_GUARD,XP(I)::QAR2(E)
- R(f);OGATEB::QAR(E),XR(f)
- R(f);OGATEB::R(K),XR(f)
- R(f);N_GUARD::QAR2(E),XR(f)
- R(f);OGATE::PXR(f)=Q
- S(d);N_PINS(D)::S(D)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- Tries
- Try
- S(G);N_SPINS(D)
- Threat
- S(D)
- Vars
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- R(f);N_GUARD,XP(I)::QAR2(E)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- R(f);OGATE::PXR(f)=Q
- Refutation
- R(f);
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- R(f);N_GUARD,XP(I)::QAR2(E)
- B(a);XP(B)::S(G)
- Refutation
- R(f);
- Try
- S(G);N_SPINS(D)
- Threat
- DUALS(2)
- Vars
- B(a);XP(B)::S(D)
- Refutation
- R(f);
- Try
- R(C);N_SPINS(D)
- Threat
- S(D)
- Vars
- R(f);N_GUARD,XP(I)::QAR2(E)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- R(f);OGATE::PXR(f)=Q
- Refutation
- Q(e);N_SPINQ(e),XB(J)
- Try
- R(C);N_SPINS(D),XQ(e)
- Threat
- DUALS(2)
- Refutation
- B(h);P_PINS(D),P_SPINB(h),XR(C)
- Try
- Q(E);
- Threat
- QAB1(E)
- Vars
- R(f);N_GUARD::QAR1(E)
- Refutation
- S(b);
- Try
- Q(E);N_SPINS(D)
- Threat
- S(D)
- Vars
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- R(f);OGATE::PXR(f)=Q
- Refutation
- R(f);XP(I)
- Try
- Q(E);
- Threat
- DUALS(3)
- Vars
- R(f);OGATE::PXR(f)=Q
- Refutation
- R(f);XQ(E)
- Try
- P(B);N_SPINS(D)
- Threat
- S(D)
- Vars
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- R(f);N_GUARD,XP(I)::QAR2(E)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- R(f);OGATE::PXR(f)=Q
- Refutation
- B(a);
- Try
- Actual
- R(K);N_SPINS(D)
- Threat
- S(D)
- Vars
- Q(e);N_SPINQ(e),OGATE,XB(J)::R1(C)
- R(f);N_GUARD,XP(I)::QAR2(E)
- S(d);OGATE,XP(F)::QAB(E),XS(d)
- R(f);OGATE::PXR(f)=Q
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).