MESON Chess Problem Database
Problem Display
PID: 3115 (2rr3b/n4Qn1/1BPk1pP1/1pR2P2/bp3P1N/1p6/1K6/8 w - - 0 1)
Penrose, Lionel Sharples
1st Prize, Good Companions (April Complete Blocks), 1918
#2
9 + 11
| 2681 | All Change Here! | 1919 |
| 3132 | The Good Companion Two-Mover | 1922 |
| 1577 | Jaarboek | 1933 |
| 56 | The Problemist | 2001 |
SOLUTION
- SOUND
- Sets
- 1...Rxc6
- 2.Rd5#
- 1...Rc7
- 2.Qxc7#
- 1...Ra8
- 2.Qc7#
- 1...Rb8
- 2.Qc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sxc6
- 2.Rd5#
- 1...Sxf5
- 2.Sxf5#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 2.Qf8#
- 1...Rxc6
- Tries
- 1.Ka1?
- 1...Rxc6
- 2.Rd5#
- 1...Sxc6
- 2.Rd5#
- 1...Sxf5
- 2.Sxf5#
- 1...Rc7
- 2.Qxc7#
- 1...Ra8
- 2.Qc7#
- 1...Rb8
- 2.Qc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 2.Qf8#
- 1...b2+!
- 1...Rxc6
- 1.Kb1?
- 1...Rxc6
- 2.Rd5#
- 1...Sxc6
- 2.Rd5#
- 1...Sxf5
- 2.Sxf5#
- 1...Rc7
- 2.Qxc7#
- 1...Ra8
- 2.Qc7#
- 1...Rb8
- 2.Qc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 2.Qf8#
- 1...b2!
- 1...Rxc6
- 1.Sg2?
- 1...Rxc6
- 2.Rd5#
- 1...Sxc6
- 2.Rd5#
- 1...Rc7
- 2.Qxc7#
- 1...Ra8
- 2.Qc7#
- 1...Rb8
- 2.Qc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 2.Qf8#
- 1...Sxf5!
- 1...Rxc6
- 1.Sf3?
- 1...Rxc6
- 2.Rd5#
- 1...Sxc6
- 2.Rd5#
- 1...Rc7
- 2.Qxc7#
- 1...Ra8
- 2.Qc7#
- 1...Rb8
- 2.Qc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 2.Qf8#
- 1...Sxf5!
- 1...Rxc6
- 1.Rc2?
- 1...Rxc6
- 2.Rd2#
- 1...Sxc6
- 2.Bc5#
- 1...Sxf5
- 2.Sxf5#
- 1...Se6
- 2.Qxe6#
- 1...Rc7
- 2.Bxc7#
- 1...Ra8
- 2.Bc7#
- 1...Rb8
- 2.Bc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...bxc2!
- 1...Rxc6
- 1.Rc3?
- 1...Rxc6
- 2.Rd3#
- 1...Sxc6
- 2.Bc5#
- 1...Sxf5
- 2.Sxf5#
- 1...Se6
- 2.Qxe6#
- 1...Rc7
- 2.Bxc7#
- 1...Ra8
- 2.Bc7#
- 1...Rb8
- 2.Bc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...bxc3+!
- 1...Rxc6
- 1.Rc4?
- 1...Rxc6
- 2.Rd4#
- 1...Sxc6
- 2.Bc5#
- 1...Sxf5
- 2.Sxf5#
- 1...Se6
- 2.Qxe6#
- 1...Rc7
- 2.Bxc7#
- 1...Ra8
- 2.Bc7#
- 1...Rb8
- 2.Bc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...bxc4!
- 1...Rxc6
- 1.Ka1?
- Keys
- 1.Rc1!
- 1...Rxc6
- 2.Rd1#
- 1...Sxc6
- 2.Bc5#
- 1...Sxf5
- 2.Sxf5#
- 1...Se6
- 2.Qxe6#
- 1...Rc7
- 2.Bxc7#
- 1...Ra8
- 2.Bc7#
- 1...Rb8
- 2.Bc7#
- 1...Rd7
- 2.Qxd7#
- 1...Re8
- 2.Qd7#
- 1...Rf8
- 2.Qd7#
- 1...Rg8
- 2.Qd7#
- 1...Sh5
- 2.Qe6#
- 1...Se8
- 2.Qe6#
- 1...Rxc6
- 1.Rc1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(i);SBLOCK,XP(G)::R1(D)
- R(i);N_GUARD::QAB1(I),XR(i)
- R(i);N_GUARD::QAB1(I)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(g);SBLOCK,XP(G)::R1(D)
- S(h);XP(E)::S(C),XS(h)
- S(h);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I),XS(h)
- Tries
- Try
- K(A);S_FLIGHT
- Vars
- R(i);SBLOCK,XP(G)::R1(D)
- S(g);SBLOCK,XP(G)::R1(D)
- S(h);XP(E)::S(C),XS(h)
- R(i);N_GUARD::QAB1(I),XR(i)
- R(i);N_GUARD::QAB1(I)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I),XS(h)
- Refutation
- P(a);CHECK
- Try
- K(A);P-FLIGHT
- Vars
- R(i);SBLOCK,XP(G)::R1(D)
- S(g);SBLOCK,XP(G)::R1(D)
- S(h);XP(E)::S(C),XS(h)
- R(i);N_GUARD::QAB1(I),XR(i)
- R(i);N_GUARD::QAB1(I)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I),XS(h)
- Refutation
- P(a);
- Try
- S(C);
- Vars
- R(i);SBLOCK,XP(G)::R1(D)
- S(g);SBLOCK,XP(G)::R1(D)
- R(i);N_GUARD::QAB1(I),XR(i)
- R(i);N_GUARD::QAB1(I)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I),XS(h)
- Refutation
- S(h);XP(E)
- Try
- S(C);
- Vars
- R(i);SBLOCK,XP(G)::R1(D)
- S(g);SBLOCK,XP(G)::R1(D)
- R(i);N_GUARD::QAB1(I),XR(i)
- R(i);N_GUARD::QAB1(I)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I),XS(h)
- Refutation
- S(h);XP(E)
- Try
- R(D);
- Vars
- R(i);SBLOCK,XP(G)::R(D)
- S(g);SBLOCK,XP(G)::B(F)
- S(h);XP(E)::S(C),XS(h)
- S(h);N_GUARD::QAR1(I),XS(h)
- R(i);N_GUARD::B(F),XR(i)
- R(i);N_GUARD::B(F)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- Refutation
- P(a);XR(D)
- Try
- R(D);
- Vars
- R(i);SBLOCK,XP(G)::R(D)
- S(g);SBLOCK,XP(G)::B(F)
- S(h);XP(E)::S(C),XS(h)
- S(h);N_GUARD::QAR1(I),XS(h)
- R(i);N_GUARD::B(F),XR(i)
- R(i);N_GUARD::B(F)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- Refutation
- P(c);CHECK,XR(D)
- Try
- R(D);
- Vars
- R(i);SBLOCK,XP(G)::R(D)
- S(g);SBLOCK,XP(G)::B(F)
- S(h);XP(E)::S(C),XS(h)
- S(h);N_GUARD::QAR1(I),XS(h)
- R(i);N_GUARD::B(F),XR(i)
- R(i);N_GUARD::B(F)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
- Refutation
- P(d);XR(D)
- Try
- Actual
- R(D);
- Vars
- R(i);SBLOCK,XP(G)::R(D)
- S(g);SBLOCK,XP(G)::B(F)
- S(h);XP(E)::S(C),XS(h)
- S(h);N_GUARD::QAR1(I),XS(h)
- R(i);N_GUARD::B(F),XR(i)
- R(i);N_GUARD::B(F)
- R(j);N_GUARD::QAR1(I),XR(j)
- R(j);N_GUARD::QAR1(I)
- S(h);N_GUARD::QAR1(I)
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).