MESON Chess Problem Database
Problem Display
PID: 210063 (2RrB1N1/1Pbn1p2/3kpN1Q/1K1Pr1P1/3R4/7p/5n1B/8 w - - 0 1)
Rietveld, Johannes Jacob
The Observer, 1920
(First published on Sun Aug 8 1920)
#2
11 + 9
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sd1
- 2.Se4#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sxf6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...exd5
- 2.Se4#
- 1...Rxc8
- Tries
- 1.Bg3?
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxf6
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...h2!
- 1...Rxc8
- 1.Bf4?
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxf6
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...h2!
- 1...Rxc8
- 1.Bxe5+?
- 1...Sxe5
- 2.Qf8#
- 1...Kxe5!
- 1...Sxe5
- 1.Rd2?
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxf6
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...Sd3!
- 1...Rxc8
- 1.Rd3?
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxf6
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...Sxd3!
- 1...Rxc8
- 1.Rc4?
- threat
- 2.Rc6#
- 1...Sc5
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sxf6!
- threat
- 1.Rxd8?
- threat
- 2.Rxd7#
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Ba5
- 2.Rxd7#
- 1...Bb6
- 2.Rxd7#
- 1...Bb8
- 2.Rxd7#
- 1...Bxd8!
- threat
- 1.Qg7?
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxf6
- 2.Qf8#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sb8
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...exd5!
- 1...Rxc8
- 1.b8Q?
- threat
- 2.Qxc7#
- 1...Bxb8
- 2.Rc6#
- 1...Sxb8
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Rxc8!
- threat
- 1.b8S?
- 1...Rxe8
- 2.Sxe8#
- 1...Bxb8
- 2.Rc6#
- 1...Sxf6
- 2.Qf8#
- 1...Sxb8
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...Rxc8!
- 1...Rxe8
- 1.b8B?
- threat
- 2.Bxc7#
- 1...Bxb8
- 2.Rc6#
- 1...Sxb8
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Rxc8!
- threat
- 1.b8R?
- 1...Rxe8
- 2.Sxe8#
- 1...Bxb8
- 2.Rc6#
- 1...Sxf6
- 2.Qf8#
- 1...Sxb8
- 2.Qf8#
- 1...exd5
- 2.Se4#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.Qf8#
- 1...Sb6
- 2.Qf8#
- 1...Sf8
- 2.Qxf8#
- 1...Rxc8!
- 1...Rxe8
- 1.Bg3?
- Keys
- 1.Qxh3!
- 1...Rxc8
- 2.bxc8S#
- 1...Rxe8
- 2.Sxe8#
- 1...Sxh3
- 2.Se4#
- 1...Sxf6
- 2.Qa3#
- 1...exd5
- 2.Rxd5#
- 1...Sd1
- 2.Se4#
- 1...Ba5
- 2.Rc6#
- 1...Bb6
- 2.Rc6#
- 1...Bb8
- 2.Rc6#
- 1...Sh1
- 2.Se4#
- 1...Sd3
- 2.Se4#
- 1...Se4
- 2.Sxe4#
- 1...Sg4
- 2.Se4#
- 1...Sc5
- 2.dxe6#
- 1...Sb6
- 2.Qa3#
- 1...Sb8
- 2.Qa3#
- 1...Sf8
- 2.Qa3#
- 1...Rxc8
- 1.Qxh3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD,XS(F)::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- Tries
- Try
- B(A);
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(g);N_GUARD,XS(F)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- P(b);
- Try
- B(A);
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(g);N_GUARD,XS(F)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- P(b);
- Try
- B(A);CHECK,N_SPINP(D),XR(c)
- Vars
- S(g);SBLOCK,XB(A)::QAB(G)
- Refutation
- K(d);S_FLIGHT,XB(A)
- Try
- R(B);
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(g);N_GUARD,XS(F)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- S(a);
- Try
- R(B);
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(g);N_GUARD,XS(F)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- S(a);XR(B)
- Try
- R(B);
- Threat
- R1(B)
- Vars
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- Refutation
- S(g);XS(F)
- Try
- R(I);P_PINS(g),XR(i)
- Threat
- DUALS(2)
- Vars
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- B(f);::R1(I),XS(g)
- Refutation
- B(f);N_SPINS(g),XR(I)
- Try
- Q(G);
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(g);N_GUARD,XS(F)::QAB(G)
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- P(e);P_SPINP(e),XP(D)
- Try
- P(H);P_PINB(f)
- Threat
- QAB1(H),XB(f)
- Vars
- B(f);N_SPINB(f),OGATE,XQ(H)::R1(I)
- S(g);N_GUARD,N_SPINB(f),XQ(H)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- Refutation
- R(i);XR(I)
- Try
- P(H);
- Vars
- R(i);XB(J)::S(F),XR(i)
- B(f);OGATE,XS(H)::R1(I)
- S(g);N_GUARD,XS(F)::QAB(G)
- S(g);N_GUARD,XS(H)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- R(i);XR(I)
- Try
- P(H);P_PINB(f)
- Threat
- B(H),XB(f)
- Vars
- B(f);N_SPINB(f),OGATE,XB(H)::R1(I)
- S(g);N_GUARD,N_SPINB(f),XB(H)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- Refutation
- R(i);XR(I)
- Try
- P(H);
- Vars
- R(i);XB(J)::S(F),XR(i)
- B(f);OGATE,XR(H)::R1(I)
- S(g);N_GUARD,XS(F)::QAB(G)
- S(g);N_GUARD,XR(H)::QAB(G)
- P(e);P_SPINP(e),XP(D)::QAR(G)+S(F),DCHECK
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_GUARD,N_PINP(D)::QAB(G)
- S(g);N_GUARD::QAB(G)
- S(g);N_GUARD::QAB(G),XS(g)
- Refutation
- R(i);XR(I)
- Try
- Actual
- Q(G);XP(b)
- Vars
- R(i);OGATE,XR(I)::PXR(i)=S
- R(i);XB(J)::S(F),XR(i)
- S(a);N_GUARD,XQ(G)::S(F)
- S(g);N_GUARD,XS(F)::QAB(G)
- P(e);OGATE,P_SPINP(e),XP(D)::R1(B),XP(e)
- S(a);N_GUARD::S(F)
- B(f);OGATE::R1(I)
- S(a);N_GUARD::S(F),XS(a)
- S(g);N_PINP(D)::R(B)+P(D),XP(e)
- S(g);N_GUARD::QAB(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).