MESON Chess Problem Database
Problem Display
PID: 54015 (8/p7/Pn3n1B/K1Q1N1r1/2bp3b/4k1pN/1R2P1B1/8 w - - 0 1)
Penrose, Lionel Sharples
Chess Life, 1956
#2
9 + 9
SOLUTION
- SOUND
- Sets
- 1...Ba2
- 2.Qc1#
- 1...Bxe2
- 2.Qc1#
- 1...Bb3
- 2.Qc1#
- 1...Bd3
- 2.Qc1#
- 1...Bb5
- 2.Qc1#
- 1...Bd5
- 2.Qc1#
- 1...Bxa6
- 2.Qc1#
- 1...Be6
- 2.Qc1#
- 1...Bf7
- 2.Qc1#
- 1...Bg8
- 2.Qc1#
- 1...Sa4
- 2.Sxc4#
- 1...Sbd5
- 2.Sxc4#
- 1...Sbd7
- 2.Sxc4#
- 1...Sa8
- 2.Sxc4#
- 1...Sc8
- 2.Sxc4#
- 1...Se4
- 2.Sg4#
- 1...Sg4
- 2.Sxg4#
- 1...Sfd5
- 2.Sg4#
- 1...Sh5
- 2.Sg4#
- 1...Sfd7
- 2.Sg4#
- 1...Sh7
- 2.Sg4#
- 1...Se8
- 2.Sg4#
- 1...Sg8
- 2.Sg4#
- 1...Ba2
- Tries
- 1.Bh1?
- 1...Bxe2
- 2.Qc1#
- 1...Bxa6
- 2.Qc1#
- 1...Ba2
- 2.Qc1#
- 1...Bb3
- 2.Qc1#
- 1...Bd3
- 2.Qc1#
- 1...Bb5
- 2.Qc1#
- 1...Bd5
- 2.Qc1#
- 1...Be6
- 2.Qc1#
- 1...Bf7
- 2.Qc1#
- 1...Bg8
- 2.Qc1#
- 1...Sa4
- 2.Sxc4#
- 1...Sbd5
- 2.Sxc4#
- 1...Sbd7
- 2.Sxc4#
- 1...Sa8
- 2.Sxc4#
- 1...Sc8
- 2.Sxc4#
- 1...Se4
- 2.Sg4#
- 1...Sg4
- 2.Sxg4#
- 1...Sfd5
- 2.Sg4#
- 1...Sh5
- 2.Sg4#
- 1...Sfd7
- 2.Sg4#
- 1...Sh7
- 2.Sg4#
- 1...Se8
- 2.Sg4#
- 1...Sg8
- 2.Sg4#
- 1...g2!
- 1...Bxe2
- 1.Bf3?
- 1...Bxe2
- 2.Rxe2#
- 2.Qc1#
- 1...Bxa6
- 2.Qc1#
- 1...Ba2
- 2.Qc1#
- 1...Bb3
- 2.Qc1#
- 1...Bd3
- 2.Qc1#
- 1...Bb5
- 2.Qc1#
- 1...Bd5
- 2.Qc1#
- 1...Be6
- 2.Qc1#
- 1...Bf7
- 2.Qc1#
- 1...Bg8
- 2.Qc1#
- 1...Sa4
- 2.Sxc4#
- 1...Sbd5
- 2.Sxc4#
- 1...Sbd7
- 2.Sxc4#
- 1...Sa8
- 2.Sxc4#
- 1...Sc8
- 2.Sxc4#
- 1...Se4
- 2.Sg4#
- 1...Sg4
- 2.Sxg4#
- 1...Sfd5
- 2.Sg4#
- 1...Sh5
- 2.Sg4#
- 1...Sfd7
- 2.Sg4#
- 1...Sh7
- 2.Sg4#
- 1...Se8
- 2.Sg4#
- 1...Sg8
- 2.Sg4#
- 1...g2!
- 1...Bxe2
- 1.Ra2?
- 1...Bxe2
- 2.Qc1#
- 1...Bxa6
- 2.Qc1#
- 1...Bb3
- 2.Qc1#
- 1...Bd3
- 2.Qc1#
- 1...Bb5
- 2.Qc1#
- 1...Bd5
- 2.Qc1#
- 1...Be6
- 2.Qc1#
- 1...Bf7
- 2.Qc1#
- 1...Bg8
- 2.Qc1#
- 1...Sa4
- 2.Sxc4#
- 1...Sbd5
- 2.Sxc4#
- 1...Sbd7
- 2.Sxc4#
- 1...Sa8
- 2.Sxc4#
- 1...Sc8
- 2.Sxc4#
- 1...Se4
- 2.Sg4#
- 1...Sg4
- 2.Sxg4#
- 1...Sfd5
- 2.Sg4#
- 1...Sh5
- 2.Sg4#
- 1...Sfd7
- 2.Sg4#
- 1...Sh7
- 2.Sg4#
- 1...Se8
- 2.Sg4#
- 1...Sg8
- 2.Sg4#
- 1...Bxa2!
- 1...Bxe2
- 1.Qa3+?
- 1...Bd3
- 2.Qxd3#
- 1...d3
- 2.Qc5#
- 1...Bb3!
- 1...Bd3
- 1.Qb4?
- threat
- 2.Qd2#
- 1...d3
- 2.Qc5#
- 1...Se4!
- threat
- 1.Qxc4?
- threat
- 2.Qd3#
- 2.Qc1#
- 1...Se4
- 2.Qd3#
- 1...d3
- 2.Qxd3#
- 2.Qf4#
- 2.Qc5#
- 1...Sxc4+!
- threat
- 1.Qb5?
- 1...Bxe2
- 2.Rxe2#
- 2.Qxe2#
- 1...d3
- 2.Qc5#
- 1...Ba2
- 2.Qd3#
- 1...Bb3
- 2.Qd3#
- 1...Bd3
- 2.Qxd3#
- 1...Bd5
- 2.Qd3#
- 1...Be6
- 2.Qd3#
- 1...Bf7
- 2.Qd3#
- 1...Bg8
- 2.Qd3#
- 1...Sa4
- 2.Sxc4#
- 1...Sbd5
- 2.Sxc4#
- 1...Sbd7
- 2.Sxc4#
- 1...Sa8
- 2.Sxc4#
- 1...Sc8
- 2.Sxc4#
- 1...Se4
- 2.Sg4#
- 1...Sg4
- 2.Sxg4#
- 1...Sfd5
- 2.Sg4#
- 1...Sh5
- 2.Sg4#
- 1...Sfd7
- 2.Sg4#
- 1...Sh7
- 2.Sg4#
- 1...Se8
- 2.Sg4#
- 1...Sg8
- 2.Sg4#
- 1...Bxb5!
- 1...Bxe2
- 1.Bh1?
- Keys
- 1.Qc6!
- threat
- 2.Qf3#
- 1...Bxe2
- 2.Qc1#
- 1...d3
- 2.Qc5#
- 1...Bd5
- 2.Qc1#
- 1...Sbd5
- 2.Sxc4#
- 1...Se4
- 2.Qxe4#
- 1...Sfd5
- 2.Sg4#
- threat
- 1.Qc6!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 18
- Sets
- B(c);OGATE::QAB(F)
- B(c);OGATE,XP(B)::QAB(F)
- B(c);OGATE,XP(H)::QAB(F)
- S(g);N_GUARD::S(G),XB(c)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD::S(G),XS(h)
- Tries
- Try
- B(C);
- Vars
- B(c);OGATE,XP(B)::QAB(F)
- B(c);OGATE,XP(H)::QAB(F)
- B(c);OGATE::QAB(F)
- S(g);N_GUARD::S(G),XB(c)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD::S(G),XS(h)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- B(c);OGATE,XP(H)::QAB(F)
- B(c);OGATE::QAB(F)
- S(g);N_GUARD::S(G),XB(c)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD::S(G),XS(h)
- Refutation
- P(b);
- Try
- R(A);
- Vars
- B(c);OGATE,XP(B)::QAB(F)
- B(c);OGATE,XP(H)::QAB(F)
- B(c);OGATE::QAB(F)
- S(g);N_GUARD::S(G),XB(c)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD::S(G),XS(h)
- Refutation
- B(c);XR(A)
- Try
- Q(F);CHECK,N_PINP(d),P_SPINS(G)
- Vars
- B(c);N_GUARD,P_SPINB(c)::QAR1(F),XB(c)
- P(d);OGATEB,P_SPINP(d)::QAB(F)
- Refutation
- B(c);P_SPINB(c)
- Try
- Q(F);N_PINP(d),P_SPINS(G)
- Threat
- QAB1(F)
- Vars
- P(d);OGATEB::QAB(F)
- Refutation
- S(h);
- Try
- Q(F);N_PINP(d),P_SPINS(G),XB(c)
- Threat
- DUALS(2)
- Vars
- S(h);::QAR1(F)
- Refutation
- S(g);CHECK,XQ(F)
- Try
- Q(F);N_PINP(d)
- Vars
- P(d);OGATEB::QAB(F)
- B(c);OGATE::QAR1(F)
- B(c);OGATE::QAR1(F),XB(c)
- S(g);N_GUARD::S(G),XB(c)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD::S(G),XS(h)
- Refutation
- B(c);XQ(F)
- Try
- Actual
- Q(F);N_PINP(d),P_SPINS(G)
- Threat
- QAR1(F)
- Vars
- B(c);OGATE,XP(B)::QAB(F)
- P(d);OGATEB::QAB(F)
- B(c);N_PINS(G),OGATE::QAB(F)
- S(g);N_PINS(G)::S(G),XB(c)
- S(h);N_GUARD::QAR1(F),XS(h)
- S(h);N_PINS(G)::S(G)
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).