MESON Chess Problem Database
Problem Display
PID: 40374 (2b1NQ2/2P4r/pRP1kB2/P6p/B1p1P2b/5Np1/2n1K1P1/8 w - - 0 1)
Butcher, FG
1st HM., The Observer, 1960
(First published on Sun Jan 10 1960)
#2
12 + 9
| 17397 | Ling Notebooks | 2023 |
SOLUTION
- SOUND
- Sets
- 1...Rh6
- 2.Sg7#
- 2.Qe7#
- 2.Qg8#
- 1...Rxc7
- 2.Sxc7#
- 1...Rd7
- 2.cxd7#
- 1...Re7
- 2.Qxe7#
- 1...Rf7
- 2.Qd6#
- 1...Rg7
- 2.Sxg7#
- 1...Rh8
- 2.Sg7#
- 2.Qe7#
- 1...Bg5
- 2.Sxg5#
- 1...Bxf6
- 2.Qxf6#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Sa1
- 2.Sd4#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Se3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...Sd4+
- 2.Sxd4#
- 1...c3
- 2.Bb3#
- 1...Rh6
- Tries
- 1.Kd1?
- 1...Rd7+
- 2.cxd7#
- 1...Rxc7
- 2.Sxc7#
- 1...Bxf6
- 2.Qxf6#
- 1...Rh6
- 2.Sg7#
- 2.Qe7#
- 2.Qg8#
- 1...Re7
- 2.Qxe7#
- 1...Rf7
- 2.Qd6#
- 1...Rg7
- 2.Sxg7#
- 1...Rh8
- 2.Sg7#
- 2.Qe7#
- 1...Bg5
- 2.Sxg5#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Sa1
- 2.Sd4#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...c3
- 2.Bb3#
- 1...Se3+!
- 1...Rd7+
- 1.Kf1?
- 1...Rxc7
- 2.Sxc7#
- 1...Bxf6
- 2.Qxf6#
- 1...Rh6
- 2.Sg7#
- 2.Qe7#
- 2.Qg8#
- 1...Rd7
- 2.cxd7#
- 1...Re7
- 2.Qxe7#
- 1...Rf7
- 2.Qd6#
- 1...Rg7
- 2.Sxg7#
- 1...Rh8
- 2.Sg7#
- 2.Qe7#
- 1...Bg5
- 2.Sxg5#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Sa1
- 2.Sd4#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...c3
- 2.Bb3#
- 1...Se3+!
- 1...Rxc7
- 1.Kd2?
- 1...Rd7+
- 2.cxd7#
- 1...Bg5+
- 2.Sxg5#
- 1...Rxc7
- 2.Sxc7#
- 1...Bxf6
- 2.Qxf6#
- 1...Rh6
- 2.Sg7#
- 2.Qe7#
- 2.Qg8#
- 1...Re7
- 2.Qxe7#
- 1...Rf7
- 2.Qd6#
- 1...Rg7
- 2.Sxg7#
- 1...Rh8
- 2.Sg7#
- 2.Qe7#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Sa1
- 2.Sd4#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Se3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...c3+!
- 1...Rd7+
- 1.Se5?
- threat
- 2.Qd6#
- 1...Rd7
- 2.cxd7#
- 1...Re7
- 2.Qxe7#
- 1...Sd4+!
- threat
- 1.Bxc2?
- threat
- 2.Sd4#
- 1...Bxf6
- 2.Qxf6#
- 1...Rd7!
- threat
- 1.Bb5?
- threat
- 2.Bxc4#
- 1...Sd4+
- 2.Sxd4#
- 1...Rd7
- 2.cxd7#
- 1...Sa3
- 2.Sd4#
- 1...Se3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...c3
- 2.Bc4#
- 1...axb5!
- threat
- 1.Bxh4?
- threat
- 2.Qf5#
- 2.Qf6#
- 1...Rh6
- 2.Sg7#
- 2.Qe7#
- 2.Qf5#
- 2.Qg8#
- 1...Rf7
- 2.Qd6#
- 1...Se3
- 2.Qf6#
- 1...Sd4+!
- threat
- 1.Rb5?
- threat
- 2.Re5#
- 1...Sd4+
- 2.Sxd4#
- 1...Bxf6
- 2.Qxf6#
- 1...axb5!
- threat
- 1.Qg7?
- 1...Sd4+
- 2.Sxd4#
- 1...Bxf6
- 2.Qxf6#
- 1...Rh6
- 2.Qe7#
- 2.Qg8#
- 1...Rh8
- 2.Qe7#
- 1...Bg5
- 2.Sxg5#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Sa1
- 2.Sd4#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Se3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...c3
- 2.Bb3#
- 1...Rxg7!
- 1...Sd4+
- 1.Kd1?
- Keys
- 1.Bh8!
- 1...Sd4+
- 2.Sxd4#
- 1...Rxc7
- 2.Sxc7#
- 1...Rxh8
- 2.Sg7#
- 1...Sa1
- 2.Sd4#
- 1...Rh6
- 2.Sg7#
- 1...Rd7
- 2.cxd7#
- 1...Re7
- 2.Qf5#
- 1...Rf7
- 2.Qd6#
- 1...Rg7
- 2.Sxg7#
- 1...Bg5
- 2.Sxg5#
- 1...Bf6
- 2.Qxf6#
- 1...Be7
- 2.Qf5#
- 1...Bd8
- 2.cxd8S#
- 1...Bb7
- 2.cxb7#
- 1...Bd7
- 2.cxd7#
- 1...Se1
- 2.Sd4#
- 1...Sa3
- 2.Sd4#
- 1...Se3
- 2.Sd4#
- 1...Sb4
- 2.Sd4#
- 1...c3
- 2.Bb3#
- 1...Sd4+
- 1.Bh8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- R(h);XP(J)::S(K),XR(h)
- R(h);OGATE::R(G)+P(H),XR(h)
- R(h);N_GUARD::QAR1(L),XR(h)
- R(h);SBLOCK::QAR1(L)
- R(h);N_GUARD::S(K),XR(h)
- B(d);N_GUARD::S(C),XB(d)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- B(i);OGATE::R(G)+P(H),XB(i)
- S(a);N_GUARD::S(C)
- S(a);CHECK,N_GUARD::S(C),XS(a)
- P(c);OGATEB::B(D)
- Tries
- Try
- K(A);S_FLIGHT
- Vars
- R(h);CHECK,OGATE::R(G)+P(H),XR(h)
- R(h);XP(J)::S(K),XR(h)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- R(h);N_GUARD::QAR1(L),XR(h)
- R(h);SBLOCK::QAR1(L)
- R(h);N_GUARD::S(K),XR(h)
- B(d);N_GUARD::S(C),XB(d)
- B(i);OGATE::R(G)+P(H),XB(i)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- P(c);OGATEB::B(D)
- Refutation
- S(a);CHECK
- Try
- K(A);S_FLIGHT
- Vars
- R(h);XP(J)::S(K),XR(h)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- R(h);OGATE::R(G)+P(H),XR(h)
- R(h);N_GUARD::QAR1(L),XR(h)
- R(h);SBLOCK::QAR1(L)
- R(h);N_GUARD::S(K),XR(h)
- B(d);N_GUARD::S(C),XB(d)
- B(i);OGATE::R(G)+P(H),XB(i)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- P(c);OGATEB::B(D)
- Refutation
- S(a);CHECK
- Try
- K(A);P-FLIGHT
- Vars
- R(h);CHECK,OGATE::R(G)+P(H),XR(h)
- B(d);CHECK,N_GUARD::S(C),XB(d)
- R(h);XP(J)::S(K),XR(h)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- R(h);N_GUARD::QAR1(L),XR(h)
- R(h);SBLOCK::QAR1(L)
- R(h);N_GUARD::S(K),XR(h)
- B(i);OGATE::R(G)+P(H),XB(i)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- Refutation
- P(c);CHECK
- Try
- S(C);
- Threat
- QAR1(L)
- Vars
- R(h);OGATE::R(G)+P(H),XR(h)
- R(h);N_GUARD::QAR1(L),XR(h)
- Refutation
- S(a);CHECK
- Try
- B(D);XS(a)
- Threat
- S(C)
- Vars
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- Refutation
- R(h);
- Try
- B(D);
- Threat
- B(D),XP(c)
- Vars
- S(a);CHECK,N_GUARD::S(C),XS(a)
- R(h);OGATE::R(G)+P(H),XR(h)
- S(a);N_GUARD::S(C)
- P(c);::B(D)
- Refutation
- P(f);XB(D)
- Try
- B(I);XB(d)
- Threat
- DUALS(2)
- Vars
- R(h);SBLOCK::QAR1(L)
- S(a);::QAR1(L)
- Refutation
- S(a);CHECK
- Try
- R(G);
- Threat
- R1(G)
- Vars
- S(a);CHECK,N_GUARD::S(C),XS(a)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- Refutation
- P(f);XR(G)
- Try
- Q(L);
- Vars
- S(a);CHECK,N_GUARD::S(C),XS(a)
- B(d);OGATE,XB(I)::QAR1(L),XB(d)
- R(h);N_GUARD::QAR1(L)
- B(d);N_GUARD::S(C),XB(d)
- B(i);OGATE::R(G)+P(H),XB(i)
- S(a);N_GUARD::S(C)
- P(c);OGATEB::B(D)
- Refutation
- R(h);XQ(L)
- Try
- Actual
- B(I);
- Vars
- S(a);CHECK,N_GUARD::S(C),XS(a)
- R(h);XP(J)::S(K),XR(h)
- R(h);N_GUARD,XB(I)::S(K)
- S(a);N_GUARD::S(C)
- R(h);N_GUARD::S(K)
- R(h);OGATE::R(G)+P(H),XR(h)
- R(h);SBLOCK::QAB1(L)
- R(h);SBLOCK::QAR1(L)
- R(h);N_GUARD::S(K),XR(h)
- B(d);N_GUARD::S(C),XB(d)
- B(d);N_GUARD::QAR1(L),XB(d)
- B(d);SBLOCK::QAB1(L)
- B(d);OGATE::PXB(d)=S
- B(i);OGATE::R(G)+P(H),XB(i)
- P(c);OGATEB::B(D)
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).