MESON Chess Problem Database
Problem Display
PID: 51148 (r2r4/qb3B2/Rn4N1/1N3k2/4R2B/b3pK2/2Q5/8 w - - 0 1)
Allison, Christopher John
Manchester Guardian, 1951
#2
8 + 8
| 15148 | Sadier Collection | 2016 |
SOLUTION
- SOUND
- Sets
- 1...Rd4
- 2.Sxd4#
- 1...Rd5
- 2.Rd4#
- 2.Rf4#
- 2.Re5#
- 1...Rd6
- 2.Se7#
- 1...Rb8
- 2.Sd4#
- 1...Rc8
- 2.Sd4#
- 1...Re8
- 2.Sd4#
- 1...Rf8
- 2.Sd4#
- 1...Rg8
- 2.Sd4#
- 1...Rh8
- 2.Sd4#
- 1...Bc1
- 2.Se7#
- 1...Bb2
- 2.Se7#
- 1...Bd6
- 2.Sd4#
- 1...Be7
- 2.Sxe7#
- 1...Bxe4+
- 2.Qxe4#
- 1...Bd5
- 2.Sd4#
- 1...Bxa6
- 2.Rd4#
- 2.Rf4#
- 2.Re5#
- 1...Bc8
- 2.Rd4#
- 2.Rf4#
- 2.Re5#
- 1...Sa4
- 2.Rf6#
- 1...Sc4
- 2.Rf6#
- 1...Sd5
- 2.Rxe3#
- 2.Rea4#
- 2.Rb4#
- 2.Rc4#
- 2.Rd4#
- 2.Rf4#
- 2.Rg4#
- 2.Re5#
- 2.Ree6#
- 2.Re7#
- 2.Re8#
- 1...Sc8
- 2.Rf6#
- 1...Rd4
- Tries
- 1.Sd6+?
- 1...Rxd6
- 2.Se7#
- 1...Bxd6!
- 1...Rxd6
- 1.Sf4?
- threat
- 2.Be6#
- 2.Bg6#
- 1...Bxe4+
- 2.Qxe4#
- 1...Re8
- 2.Sd4#
- 2.Bg6#
- 1...Rg8
- 2.Sd4#
- 2.Be6#
- 1...Bd5
- 2.Sd4#
- 2.Bg6#
- 1...Bc8
- 2.Bg6#
- 1...Rd6!
- threat
- 1.Sh8?
- threat
- 2.Be6#
- 2.Bg6#
- 1...Bxe4+
- 2.Qxe4#
- 1...Rxh8
- 2.Sd4#
- 1...Re8
- 2.Sd4#
- 2.Bg6#
- 1...Rg8
- 2.Sd4#
- 2.Be6#
- 1...Bd5
- 2.Sd4#
- 2.Bg6#
- 1...Bc8
- 2.Bg6#
- 1...Rd6!
- threat
- 1.Be7?
- threat
- 2.Sh4#
- 1...Bxe4+
- 2.Qxe4#
- 1...Rh8
- 2.Sd4#
- 1...Bxe7!
- threat
- 1.Qb3?
- threat
- 2.Qe6#
- 1...Rd5
- 2.Rf4#
- 1...Rd6
- 2.Se7#
- 1...Re8
- 2.Sd4#
- 1...Bd5
- 2.Sd4#
- 1...Bc8
- 2.Rf4#
- 2.Re5#
- 1...Sc4
- 2.Rf6#
- 1...Sd5
- 2.Re5#
- 1...Bxe4+!
- threat
- 1.Qa2?
- threat
- 2.Qe6#
- 1...Rd5
- 2.Rf4#
- 1...Rd6
- 2.Se7#
- 1...Re8
- 2.Sd4#
- 1...Bd5
- 2.Sd4#
- 1...Bc8
- 2.Rf4#
- 2.Re5#
- 1...Sc4
- 2.Rf6#
- 1...Sd5
- 2.Re5#
- 1...Bxe4+!
- threat
- 1.Qg2?
- threat
- 2.Be6#
- 2.Qh3#
- 2.Qg4#
- 2.Qg5#
- 1...Rd6
- 2.Se7#
- 2.Qh3#
- 2.Qg4#
- 2.Qg5#
- 1...Re8
- 2.Sd4#
- 2.Qh3#
- 2.Qg4#
- 2.Qg5#
- 1...Be7
- 2.Sxe7#
- 2.Be6#
- 2.Qh3#
- 2.Qg4#
- 1...Bd5
- 2.Sd4#
- 2.Qh3#
- 2.Qg4#
- 2.Qg5#
- 1...Bc8
- 2.Rf4#
- 2.Re5#
- 2.Qh3#
- 2.Qg4#
- 2.Qg5#
- 1...Bxe4+!
- threat
- 1.Qh2?
- threat
- 2.Qf4#
- 2.Qe5#
- 2.Qh3#
- 1...Qb8
- 2.Qh3#
- 1...Rd5
- 2.Rf4#
- 2.Qf4#
- 2.Qh3#
- 1...Re8
- 2.Sd4#
- 2.Qf4#
- 2.Qh3#
- 1...Bb2
- 2.Se7#
- 2.Qf4#
- 2.Qh3#
- 1...Bd6
- 2.Sd4#
- 2.Qh3#
- 1...Sc4
- 2.Rf6#
- 2.Qf4#
- 2.Qh3#
- 1...Sd5
- 2.Re5#
- 2.Qe5#
- 2.Qh3#
- 1...Sd7
- 2.Qf4#
- 2.Qh3#
- 1...Bxe4+!
- threat
- 1.Qc5+?
- 1...Rd5
- 2.Sd4#
- 2.Sd6#
- 2.Se7#
- 2.Rf4#
- 1...Bd5
- 2.Sd4#
- 1...Sd5
- 2.Sd4#
- 2.Se7#
- 2.Rf4#
- 2.Re5#
- 2.Rf6#
- 1...Bxc5!
- 1...Rd5
- 1.Qc6?
- threat
- 2.Rf4#
- 2.Re5#
- 2.Qe6#
- 2.Qf6#
- 1...Qb8
- 2.Qe6#
- 2.Qf6#
- 1...Rd4
- 2.Sxd4#
- 2.Re5#
- 2.Qe6#
- 2.Qf6#
- 1...Rd5
- 2.Rf4#
- 2.Qe6#
- 2.Qf6#
- 1...Rd6
- 2.Se7#
- 2.Rf4#
- 2.Re5#
- 1...Re8
- 2.Sd4#
- 2.Rf4#
- 2.Qf6#
- 1...Bb2
- 2.Se7#
- 2.Rf4#
- 2.Qe6#
- 1...Bd6
- 2.Sd4#
- 1...Be7
- 2.Sxe7#
- 2.Rf4#
- 2.Re5#
- 2.Qe6#
- 1...Bc8
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Sc4
- 2.Rf4#
- 2.Qe6#
- 2.Qf6#
- 1...Sd5
- 2.Re5#
- 2.Qe6#
- 1...Sd7
- 2.Rf4#
- 2.Qe6#
- 1...Bxc6!
- threat
- 1.Qc8+?
- 1...Rd7
- 2.Sd4#
- 1...Rdxc8
- 2.Sd4#
- 1...Bxc8
- 2.Rf4#
- 2.Re5#
- 1...Sd7
- 2.Rf6#
- 1...Sxc8
- 2.Rf6#
- 1...Raxc8!
- 1...Rd7
- 1.Sd6+?
- Keys
- 1.Qc4!
- threat
- 2.Qe6#
- 1...Bxe4+
- 2.Qxe4#
- 1...Sxc4
- 2.Rf6#
- 1...Rd5
- 2.Rf4#
- 1...Rd6
- 2.Se7#
- 1...Re8
- 2.Sd4#
- 1...Bd5
- 2.Sd4#
- 1...Bc8
- 2.Rf4#
- 2.Re5#
- 1...Sd5
- 2.Re5#
- threat
- 1.Qc4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 12
- Sets
- R(h);N_GUARD::S(E),XR(h)
- R(h);S_CUTB(a)::S(G)
- R(h);N_GUARD::S(E)
- B(a);N_GUARD::S(G)
- B(a);S_CUTR(h)::S(E)
- B(a);N_GUARD::S(G),XB(a)
- B(f);CHECK,OGATE,P_SPINB(f),XR(C)::QAB1(A),XB(f)
- B(f);S_CUTR(h)::S(E)
- S(d);OGATE::R1(F)
- Tries
- Try
- S(E);CHECK
- Vars
- R(h);XS(E)::S(G)
- Refutation
- B(a);XS(E)
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- B(f);CHECK,OGATE,P_SPINB(f),XR(C)::QAB1(A),XB(f)
- B(f);N_PINR(C)::B(H)
- Refutation
- R(h);
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- B(f);CHECK,OGATE,P_SPINB(f),XR(C)::QAB1(A),XB(f)
- R(h);N_GUARD,XS(G)::S(E)
- B(f);N_PINR(C)::B(H)
- Refutation
- R(h);
- Try
- B(D);
- Threat
- S(G)
- Vars
- B(f);CHECK,OGATE,P_SPINB(f),XR(C)::QAB1(A),XB(f)
- R(h);N_GUARD::S(E)
- Refutation
- B(a);XB(D)
- Try
- Q(A);
- Threat
- QAB1(A)
- Vars
- R(h);N_PINR(C)::R1(C)
- R(h);S_CUTB(a)::S(G)
- R(h);N_GUARD::S(E)
- B(f);S_CUTR(h)::S(E)
- S(d);OGATE::R1(F)
- S(d);N_PINR(C)::R1(C)
- Refutation
- B(f);CHECK,XR(C)
- Try
- Q(A);
- Threat
- QAB1(A)
- Vars
- R(h);N_PINR(C)::R1(C)
- R(h);S_CUTB(a)::S(G)
- R(h);N_GUARD::S(E)
- B(f);S_CUTR(h)::S(E)
- S(d);OGATE::R1(F)
- S(d);N_PINR(C)::R1(C)
- Refutation
- B(f);CHECK,XR(C)
- Try
- Q(A);
- Threat
- DUALS(4)
- Refutation
- B(f);CHECK,XR(C)
- Try
- Q(A);
- Threat
- DUALS(3)
- Vars
- Q(e);::QAB(A)
- Refutation
- B(f);CHECK,XR(C)
- Try
- Q(A);CHECK
- Vars
- B(f);P_SPINB(f)::S(E)
- Refutation
- B(a);XQ(A)
- Try
- Q(A);N_SPINR(C)
- Threat
- DUALS(4)
- Vars
- B(a);S_CUTR(h)::S(E)
- Refutation
- B(f);P_PINR(C),XQ(A)
- Try
- Q(A);CHECK
- Vars
- R(h);P_SPINR(h)::S(E)
- R(h);XQ(A)::S(E)
- S(d);OGATE,P_SPINS(d)::R1(F)
- S(d);OGATE,XQ(A)::R1(F)
- Refutation
- R(g);XQ(A)
- Try
- Actual
- Q(A);
- Threat
- QAB1(A)
- Vars
- B(f);CHECK,OGATE,XR(C)::QAB1(A),XB(f)
- S(d);OGATE,XQ(A)::R1(F)
- R(h);N_PINR(C)::R1(C)
- R(h);S_CUTB(a)::S(G)
- R(h);N_GUARD::S(E)
- B(f);S_CUTR(h)::S(E)
- S(d);N_PINR(C)::R1(C)
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).