MESON Chess Problem Database
Problem Display
PID: 57156 (5Rb1/4Kpn1/2Q3R1/5k2/8/3N1p1P/3P1prp/3n1Nbr w - - 0 1)
Penrose, Lionel Sharples
1st Comm., Brisbane Courier, 1917-1918
#2
8 + 11
SOLUTION
- SOUND
- Sets
- 1...Rg3
- 2.Sxg3#
- 1...Rg4
- 2.hxg4#
- 1...Rg5
- 2.Rf6#
- 1...Rxg6
- 2.Qd5#
- 1...Bh7
- 2.Rxf7#
- 1...Sb2
- 2.Se3#
- 1...Sc3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...f6
- 2.Rfxf6#
- 1...Rg3
- Tries
- 1.Kd7?
- 1...Se6
- 2.Qxe6#
- 1...f6
- 2.Rfxf6#
- 1...Rg3
- 2.Sxg3#
- 1...Rg4
- 2.hxg4#
- 1...Rg5
- 2.Rf6#
- 1...Bh7
- 2.Rxf7#
- 1...Sb2
- 2.Se3#
- 1...Sc3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...Rxg6!
- 1...Se6
- 1.Kd8?
- 1...Se6+
- 2.Qxe6#
- 1...f6
- 2.Rfxf6#
- 1...Rg3
- 2.Sxg3#
- 1...Rg4
- 2.hxg4#
- 1...Rg5
- 2.Rf6#
- 1...Bh7
- 2.Rxf7#
- 1...Sb2
- 2.Se3#
- 1...Sc3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...Rxg6!
- 1...Se6+
- 1.Sc5?
- threat
- 2.Qe4#
- 2.Qf6#
- 1...Kf4
- 2.Qe4#
- 1...Ke5
- 2.Qe4#
- 1...Se6
- 2.Qe4#
- 1...f6
- 2.Qe4#
- 2.Qxf6#
- 1...Rg4
- 2.Qf6#
- 1...Sc3
- 2.Qf6#
- 1...Sh5
- 2.Qe4#
- 1...Se8
- 2.Qe4#
- 1...Rxg6!
- threat
- 1.Rxg2?
- threat
- 2.Qxf3#
- 2.Qd5#
- 2.Qg6#
- 1...Bh7
- 2.Rxf7#
- 2.Qxf3#
- 2.Qd5#
- 1...Sc3
- 2.Se3#
- 2.Qxf3#
- 2.Qg6#
- 1...Se3
- 2.Sxe3#
- 2.Qxf3#
- 2.Qg6#
- 1...Sh5
- 2.Qd5#
- 2.Qe6#
- 2.Qg6#
- 1...Se6
- 2.Qd5#
- 2.Qxe6#
- 1...f6
- 2.Rxf6#
- 2.Qxf3#
- 1...fxg2!
- threat
- 1.Rg3?
- threat
- 2.Qxf3#
- 2.Qd5#
- 2.Qg6#
- 1...Bh7
- 2.Rxf7#
- 2.Qxf3#
- 2.Qd5#
- 1...Sc3
- 2.Se3#
- 2.Qxf3#
- 2.Qg6#
- 1...Se3
- 2.Sxe3#
- 2.Qxf3#
- 2.Qg6#
- 1...Sh5
- 2.Qd5#
- 2.Qe6#
- 2.Qg6#
- 1...Se6
- 2.Qd5#
- 2.Qxe6#
- 1...f6
- 2.Rxf6#
- 2.Qxf3#
- 1...Rxg3!
- threat
- 1.Rg4?
- threat
- 2.Qxf3#
- 2.Qe4#
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qf6#
- 2.Qg6#
- 1...Rg3
- 2.Sxg3#
- 2.Qe4#
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qf6#
- 2.Qg6#
- 1...Bh7
- 2.Rxf7#
- 2.Qxf3#
- 2.Qe4#
- 2.Qb5#
- 2.Qd5#
- 2.Qc5#
- 2.Qf6#
- 1...Sc3
- 2.Se3#
- 2.Qxf3#
- 2.Qf6#
- 2.Qg6#
- 1...Se3
- 2.Sxe3#
- 2.Qxf3#
- 2.Qe4#
- 2.Qf6#
- 2.Qg6#
- 1...Sh5
- 2.Qe4#
- 2.Qb5#
- 2.Qd5#
- 2.Qd7#
- 2.Qc5#
- 2.Qe6#
- 2.Qg6#
- 2.Qc8#
- 1...Se6
- 2.Qe4#
- 2.Qd5#
- 2.Qxe6#
- 1...Se8
- 2.Qxf3#
- 2.Qe4#
- 2.Qb5#
- 2.Qd5#
- 2.Qd7#
- 2.Qc5#
- 2.Qe6#
- 2.Qg6#
- 2.Qc8#
- 1...f6
- 2.Rxf6#
- 2.Qxf3#
- 2.Qe4#
- 2.Qxf6#
- 1...Rxg4!
- threat
- 1.Rxg7?
- threat
- 2.Qxf3#
- 2.Qd5#
- 2.Qe6#
- 1...Rg6
- 2.Qd5#
- 2.Qxg6#
- 1...Rg3
- 2.Sxg3#
- 2.Qd5#
- 2.Qe6#
- 1...Rg4
- 2.Qd5#
- 2.Qe6#
- 2.hxg4#
- 1...Sc3
- 2.Se3#
- 2.Qxf3#
- 2.Qe6#
- 1...Se3
- 2.Sxe3#
- 2.Qxf3#
- 2.Qe6#
- 1...f6
- 2.Rxf6#
- 2.Qxf3#
- 1...Rxg7!
- threat
- 1.Rxg8?
- 1...Rxg6
- 2.Qd5#
- 1...fxg6
- 2.Qd5#
- 1...Rg3
- 2.Sxg3#
- 1...Rg4
- 2.hxg4#
- 1...Rg5
- 2.Rf6#
- 1...Sb2
- 2.Se3#
- 1...Sc3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sh5
- 2.Qd5#
- 1...Se6
- 2.Rf6#
- 2.Qd5#
- 1...Se8
- 2.Qxf3#
- 2.Qd5#
- 1...f6!
- 1...Rxg6
- 1.Kd7?
- Keys
- 1.h4!
- 1...Rxg6
- 2.Qxf3#
- 1...Rg5
- 2.Rxg5#
- 1...Se6
- 2.Qxe6#
- 1...f6
- 2.Rfxf6#
- 1...Rg3
- 2.Sxg3#
- 1...Rg4
- 2.Rf6#
- 1...Bh7
- 2.Rxf7#
- 1...Sb2
- 2.Se3#
- 1...Sc3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...Rxg6
- 1.h4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 3
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(e);N_GUARD::S(A),XR(e)
- R(e);OGATE::P(D),XR(e)
- R(e);SBLOCK::R1(F)
- R(e);SBLOCK,XR(F)::QAR2(E)
- B(k);N_GUARD::R(H),XP(i)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- S(j);N_GUARD::QAB1(E)
- S(j);N_GUARD::QAB1(E),XS(j)
- P(i);OGATE::R1(H),XP(i)
- Tries
- Try
- K(G);P-FLIGHT
- Vars
- S(j);N_GUARD::QAB1(E),XS(j)
- P(i);OGATE::R1(H),XP(i)
- R(e);N_GUARD::S(A),XR(e)
- R(e);OGATE::P(D),XR(e)
- R(e);SBLOCK::R1(F)
- B(k);N_GUARD::R(H),XP(i)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- S(j);N_GUARD::QAB1(E)
- Refutation
- R(e);XR(F)
- Try
- K(G);S_FLIGHT
- Vars
- S(j);CHECK,N_GUARD::QAB1(E),XS(j)
- P(i);OGATE::R1(H),XP(i)
- R(e);N_GUARD::S(A),XR(e)
- R(e);OGATE::P(D),XR(e)
- R(e);SBLOCK::R1(F)
- B(k);N_GUARD::R(H),XP(i)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- S(j);N_GUARD::QAB1(E)
- Refutation
- R(e);XR(F)
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- K(h);P-FLIGHT::QAR1(E)
- K(h);N_SPINP(i),P-FLIGHT::QAR1(E)
- S(j);::QAB1(E)
- R(e);::QAR1(E)
- S(a);::QAR1(E)
- Refutation
- R(e);XR(F)
- Try
- R(F);XR(e)
- Threat
- DUALS(3)
- Refutation
- P(g);XR(F)
- Try
- R(F);
- Threat
- DUALS(3)
- Refutation
- R(e);XR(F)
- Try
- R(F);
- Threat
- DUALS(7)
- Refutation
- R(e);XR(F)
- Try
- R(F);XS(j)
- Threat
- DUALS(3)
- Refutation
- R(e);XR(F)
- Try
- R(H);N_PINP(i),XB(k)
- Vars
- R(e);SBLOCK,XR(F)::QAR2(E)
- P(i);SBLOCK,XR(F)::QAR2(E)
- R(e);N_GUARD::S(A),XR(e)
- R(e);OGATE::P(D),XR(e)
- R(e);SBLOCK::R1(F)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- S(j);::QAR2(E)
- Refutation
- P(i);
- Try
- Actual
- P(D);
- Vars
- R(e);SBLOCK,XR(F)::QAR2(E),XP(g)
- R(e);N_GUARD::R1(F),XR(e)
- S(j);N_GUARD::QAB1(E),XS(j)
- P(i);OGATE::R1(H),XP(i)
- R(e);N_GUARD::S(A),XR(e)
- R(e);SBLOCK::R1(F)
- B(k);N_GUARD::R(H),XP(i)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- S(j);N_GUARD::QAB1(E)
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).