MESON Chess Problem Database
Problem Display
PID: 11067 (2b2Q2/P1kp1nNR/Pnp5/2R1p1pK/1N2P1B1/8/8/8 w - - 0 1)
Penrose, Lionel Sharples
Chess, 1936
#2
10 + 8
| 14867 | BCPS Library | 2011 |
SOLUTION
- SOUND
- Sets
- 1...Bxa6
- 2.Qb8#
- 1...Bb7
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Bxa6
- Tries
- 1.Kg6?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sh8+!
- 1...Bxa6
- 1.Bh3?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...g4!
- 1...Bxa6
- 1.Bf5?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...g4!
- 1...Bxa6
- 1.Rc1?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...c5
- 2.Rxc5#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sc4!
- 1...Bxa6
- 1.Rc2?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...c5
- 2.Rxc5#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sc4!
- 1...Bxa6
- 1.Rc3?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...c5
- 2.Rxc5#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sc4!
- 1...Bxa6
- 1.Rc4?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...c5
- 2.Rxc5#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sxc4!
- 1...Bxa6
- 1.Qd6+?
- 1...Kd8
- 2.Sxc6#
- 1...Sxd6
- 2.Se6#
- 1...Kxd6!
- 1...Kd8
- 1.Qd8+?
- 1...Kd6
- 2.Rxc6#
- 1...Sxd8
- 2.Se8#
- 1...Kxd8!
- 1...Kd6
- 1.a8Q?
- 1...Bxa6
- 2.Sxa6#
- 2.Se8#
- 2.Qab8#
- 2.Qfb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Bb7
- 2.Se8#
- 2.Qxb7#
- 2.Qab8#
- 2.Qfb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sxa8!
- 1...Bxa6
- 1.a8R?
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Bb7
- 2.Se8#
- 2.Qb8#
- 1...Sd6
- 2.Se6#
- 1...Sh6
- 2.Se6#
- 1...Sd8
- 2.Se8#
- 1...Sh8
- 2.Se6#
- 1...d5
- 2.Rxc6#
- 1...d6
- 2.Rxc6#
- 1...Sxa8!
- 1...Bxa6
- 1.Kg6?
- Keys
- 1.Sf5!
- 1...Bxa6
- 2.Qb8#
- 1...Sa4
- 2.Sd5#
- 1...Sc4
- 2.Sd5#
- 1...Sd5
- 2.Sxd5#
- 1...Sa8
- 2.Sd5#
- 1...d5
- 2.Qd6#
- 1...d6
- 2.Qxd6#
- 1...Bb7
- 2.Qb8#
- 1...Sd6
- 2.Rxc6#
- 1...Sh6
- 2.Rxc6#
- 1...Sd8
- 2.Qd6#
- 1...Sh8
- 2.Rxc6#
- 1...Bxa6
- 1.Sf5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- B(h);OGATE,XP(F)::QAB1(J)
- B(h);OGATE::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Tries
- Try
- K(E);S_FLIGHT
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(g);CHECK
- Try
- B(C);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- P(b);
- Try
- R(D);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(d);OGATEB::R(D),XP(d)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);N_SPINP(d)
- Try
- R(D);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(d);OGATEB::R(D),XP(d)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);N_SPINP(d)
- Try
- R(D);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(d);OGATEB::R(D),XP(d)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);N_SPINP(d)
- Try
- R(D);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(d);OGATEB::R(D),XP(d)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);N_SPINP(d),XR(D)
- Try
- Q(J);CHECK
- Vars
- K(e);N_SPINP(d),P_SPINP(f),S_FLIGHT::S(A),XP(d)
- S(g);SBLOCK,XQ(J)::S(H)
- Refutation
- K(e);N_SPINP(d),S_FLIGHT,XQ(J)
- Try
- Q(J);CHECK
- Vars
- K(e);N_SPINP(d),P_SPINP(f),S_FLIGHT::R1(D),XP(d)
- S(g);SBLOCK,XQ(J)::S(H)
- Refutation
- K(e);N_SPINP(d),S_FLIGHT,XQ(J)
- Try
- P(G);
- Vars
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);XQ(G)
- Try
- P(G);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- S(g);S_CUTP(f)::S(H)
- S(g);SBLOCK::S(H)
- P(f);N_GUARD::R1(D),XP(d)
- Refutation
- S(c);XR(G)
- Try
- Actual
- S(H);
- Vars
- B(h);OGATE,XP(F)::QAB1(J)
- S(c);N_GUARD::S(A)
- S(c);N_GUARD::S(A),XS(c)
- P(f);P_SPINS(g)::QAB1(J)
- P(f);P_SPINS(g)::QAB1(J),XP(f)
- B(h);OGATE::QAB1(J)
- S(g);S_CUTP(f)::R1(D),XP(d)
- S(g);N_GUARD,SBLOCK::QAB1(J)
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).