MESON Chess Problem Database
Problem Display
PID: 67036 (3B4/3N3b/5nrp/4pPNk/K3p2q/4pn1R/4B1Q1/8 w - - 0 1)
Brotherton, David WA
3/5 Comm., The Observer, 1963
#2
8 + 10
| 136 | Problem Observer | 2006 |
SOLUTION
- SOUND
- Sets
- 1...Rxg5
- 2.Sxf6#
- 1...Rg7
- 2.Sxf6#
- 1...Rg8
- 2.Sxf6#
- 1...Rxg5
- Tries
- 1.Sxf3?
- threat
- 2.Rxh4#
- 1...Qxh3
- 2.Qxh3#
- 1...Rg4
- 2.Sxf6#
- 1...exf3+!
- threat
- 1.Se6?
- 1...Qxh3
- 2.Qxh3#
- 1...Rxg2
- 2.Sxf6#
- 1...Sxd7
- 2.Rxh4#
- 1...Rg3
- 2.Sxf6#
- 1...Rg4
- 2.Sxf6#
- 1...Rg5
- 2.Sxf6#
- 1...Rg7
- 2.Sxg7#
- 2.Sxf6#
- 1...Rg8
- 2.Sxf6#
- 1...Bg8
- 2.Qxg6#
- 1...Sd5
- 2.Rxh4#
- 1...Se8
- 2.Rxh4#
- 1...Sg8
- 2.Rxh4#
- 1...Sg4!
- 1...Qxh3
- 1.Sf7?
- 1...Qxh3
- 2.Qxh3#
- 1...Rxg2
- 2.Sxf6#
- 1...Sxd7
- 2.Rxh4#
- 1...Rg3
- 2.Sxf6#
- 1...Rg4
- 2.Sxf6#
- 1...Rg5
- 2.Sxf6#
- 1...Rg7
- 2.Sxf6#
- 1...Rg8
- 2.Sxf6#
- 1...Bg8
- 2.Qxg6#
- 1...Sd5
- 2.Rxh4#
- 1...Se8
- 2.Rxh4#
- 1...Sg8
- 2.Rxh4#
- 1...Sg4!
- 1...Qxh3
- 1.Sxh7?
- threat
- 2.Qxg6#
- 1...Qxh3
- 2.Qxh3#
- 1...Rxg2
- 2.Sdxf6#
- 1...Rg3
- 2.Sdxf6#
- 1...Rg4
- 2.Sdxf6#
- 1...Rg5
- 2.Sdxf6#
- 2.Shxf6#
- 1...Rg7
- 2.Sdxf6#
- 2.Shxf6#
- 1...Rg8
- 2.Sdxf6#
- 2.Shxf6#
- 1...Sg4!
- threat
- 1.Bxf3+?
- 1...Sg4
- 2.Bxg4#
- 2.Qxg4#
- 1...exf3+!
- 1...Sg4
- 1.Sxf3?
- Keys
- 1.Sxe4!
- 1...Qxh3
- 2.Qxh3#
- 1...Rxg2
- 2.Sxf6#
- 1...Sxe4
- 2.Rxh4#
- 1...Sxd7
- 2.Rxh4#
- 1...Rg3
- 2.Sxf6#
- 1...Rg4
- 2.Sxf6#
- 1...Rg5
- 2.Sxf6#
- 1...Rg7
- 2.Sxf6#
- 1...Rg8
- 2.Sxf6#
- 1...Bg8
- 2.Qxg6#
- 1...Sg4
- 2.Sg3#
- 1...Sd5
- 2.Rxh4#
- 1...Se8
- 2.Rxh4#
- 1...Sg8
- 2.Rxh4#
- 1...Qxh3
- 1.Sxe4!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 11
- REMOVED MATES = 0
- Sets
- R(h);N_GUARD,XS(F)::S(G),XS(g)
- R(h);N_GUARD::S(G),XS(g)
- Tries
- Try
- S(F);XS(b)
- Threat
- R1(C),XQ(d)
- Vars
- Q(d);N_SPINQ(d),OGATE,XR(C)::QAR2(B),XQ(d)
- R(h);N_GUARD::S(G),XS(g)
- Refutation
- P(c);CHECK,P_SPINP(c),XS(F)
- Try
- S(F);
- Vars
- Q(d);N_SPINQ(d),OGATE,XR(C)::QAR2(B),XQ(d)
- R(h);N_GUARD,XQ(B)::S(G),XS(g)
- S(g);XS(G)::R1(C),XQ(d)
- R(h);N_GUARD::S(G),XS(g)
- R(h);N_GUARD,N_SPINS(b)::S(G),XS(g)
- B(j);N_GUARD::QAB1(B),XR(h)
- S(g);::R1(C),XQ(d)
- Refutation
- S(g);N_SPINS(b)
- Try
- S(F);
- Vars
- Q(d);N_SPINQ(d),OGATE,XR(C)::QAR2(B),XQ(d)
- R(h);N_GUARD,XQ(B)::S(G),XS(g)
- S(g);XS(G)::R1(C),XQ(d)
- R(h);N_GUARD::S(G),XS(g)
- R(h);N_GUARD,N_SPINS(b)::S(G),XS(g)
- B(j);N_GUARD::QAB1(B),XR(h)
- S(g);::R1(C),XQ(d)
- Refutation
- S(g);N_SPINS(b)
- Try
- S(F);XB(j)
- Threat
- QAB1(B),XR(h)
- Vars
- Q(d);N_SPINQ(d),OGATE,XR(C)::QAR2(B),XQ(d)
- R(h);N_GUARD,XQ(B)::S(G),XS(g)
- R(h);N_GUARD::S(G),XS(g)
- R(h);N_GUARD,N_SPINS(b)::S(G),XS(g)
- Refutation
- S(g);N_SPINS(b)
- Try
- B(A);CHECK,XS(b)
- Refutation
- P(c);CHECK,XB(A)
- Try
- Actual
- S(F);P_SPINS(F),XP(c)
- Vars
- Q(d);N_PINS(F),N_SPINQ(d),OGATE,XR(C)::QAR2(B),XQ(d)
- R(h);N_GUARD,XQ(B)::S(G),XS(g)
- S(g);XS(F)::R1(C),XQ(d)
- S(g);XS(G)::R1(C),XQ(d)
- R(h);N_GUARD::S(G),XS(g)
- R(h);N_GUARD,N_SPINS(b)::S(G),XS(g)
- B(j);N_GUARD::QAB1(B),XR(h)
- S(g);N_PINS(F),N_SPINS(b),SBLOCK::S(F)
- S(g);::R1(C),XQ(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).