MESON Chess Problem Database
Problem Display
PID: 190907 (1B6/3B4/1K4pp/4P2r/2p1Nkbr/2p2pR1/n6P/4Q3 w - - 0 1)
Vinje, Oskar E
The Observer, 1938
(First published on Sun Aug 14 1938)
#2
8 + 10
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rxh2
- 2.Rxg4#
- 1...Rh3
- 2.Rxg4#
- 1...Bf5
- 2.e6#
- 1...f2
- 2.Qe3#
- 1...Rxh2
- Tries
- 1.Sf2?
- 1...Kg5
- 2.Qe3#
- 1...Rxh2
- 2.Rxg4#
- 1...Rxe5
- 2.Qxe5#
- 1...Bxd7
- 2.Qe4#
- 1...Rh3
- 2.Rxg4#
- 1...Rg5
- 2.Qe4#
- 1...Bh3
- 2.Qe4#
- 1...Bf5
- 2.e6#
- 1...Be6
- 2.Qe4#
- 1...Sc1
- 2.Qxc1#
- 1...Sb4
- 2.Qc1#
- 1...c2
- 2.Qd2#
- 1...g5
- 2.Qe4#
- 1...Rf5!
- 1...Kg5
- 1.Sxc3?
- threat
- 2.Qd2#
- 1...Kg5
- 2.Qd2#
- 2.Qe3#
- 1...Rxh2
- 2.Rxg4#
- 1...Bxd7
- 2.Qe4#
- 1...Be6
- 2.Qe4#
- 1...Sxc3!
- threat
- 1.Sf6?
- 1...Kg5
- 2.Qe3#
- 1...Rxh2
- 2.Rxg4#
- 1...Rxe5
- 2.Qxe5#
- 1...Bxd7
- 2.Qe4#
- 1...Rh3
- 2.Rxg4#
- 1...Rg5
- 2.Sd5#
- 2.Qe4#
- 1...Bh3
- 2.Sd5#
- 2.Qe4#
- 1...Bf5
- 2.Sd5#
- 2.e6#
- 1...Be6
- 2.Qe4#
- 1...Sc1
- 2.Qxc1#
- 1...Sb4
- 2.Qc1#
- 1...c2
- 2.Qd2#
- 1...f2
- 2.Qe3#
- 1...g5
- 2.Sd5#
- 2.Qe4#
- 1...Rf5!
- 1...Kg5
- 1.e6+?
- 1...Kf5
- 2.e7#
- 1...Re5!
- 1...Kf5
- 1.Sf2?
- Keys
- 1.Sc5!
- 1...Kg5
- 2.Qe3#
- 1...Rxh2
- 2.Rxg4#
- 1...Rxe5
- 2.Qxe5#
- 1...Bxd7
- 2.Qe4#
- 1...Rf5
- 2.Se6#
- 1...Rh3
- 2.Rxg4#
- 1...Rg5
- 2.Qe4#
- 1...Bh3
- 2.Qe4#
- 1...Bf5
- 2.e6#
- 1...Be6
- 2.Qe4#
- 1...Sc1
- 2.Qxc1#
- 1...Sb4
- 2.Qc1#
- 1...c2
- 2.Qd2#
- 1...f2
- 2.Qe3#
- 1...g5
- 2.Qe4#
- 1...Kg5
- 1.Sc5!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 11
- REMOVED MATES = 0
- Sets
- R(g);N_GUARD,XP(B)::R1(C),XB(f)
- R(g);N_GUARD::R1(C),XB(f)
- B(f);SBLOCK,S_CUTR(h)::B(H)+P(E)
- P(c);::QAB1(A)
- Tries
- Try
- S(D);
- Vars
- K(e);P_SPINB(f),S_FLIGHT::QAB(A)
- R(g);N_GUARD,XP(B)::R1(C),XB(f)
- R(h);OGATE,P_SPINR(h),XP(E)::QAB1(A),XR(h)
- B(f);XB(G)::QAR1(A)
- R(g);N_GUARD::R1(C),XB(f)
- R(h);SBLOCK::QAR1(A)
- B(f);::QAR1(A)
- B(f);SBLOCK,S_CUTR(h)::B(H)+P(E)
- S(a);N_GUARD::QAB(A),XS(a)
- S(a);N_GUARD::QAB(A)
- P(b);N_GUARD::QAB(A)
- P(i);SBLOCK::QAR1(A)
- Refutation
- R(h);
- Try
- S(D);XP(b)
- Threat
- QAB(A)
- Vars
- R(g);N_GUARD,XP(B)::R1(C),XB(f)
- B(f);XB(G)::QAR1(A)
- B(f);::QAR1(A)
- Refutation
- S(a);XS(D)
- Try
- S(D);
- Vars
- K(e);P_SPINB(f),S_FLIGHT::QAB(A)
- R(g);N_GUARD,XP(B)::R1(C),XB(f)
- R(h);OGATE,P_SPINR(h),XP(E)::QAB1(A),XR(h)
- B(f);XB(G)::QAR1(A)
- R(g);N_GUARD::R1(C),XB(f)
- B(f);::QAR1(A)
- S(a);N_GUARD::QAB(A),XS(a)
- S(a);N_GUARD::QAB(A)
- P(b);N_GUARD::QAB(A)
- P(c);::QAB1(A)
- Refutation
- R(h);
- Try
- P(E);CHECK
- Vars
- K(e);P-FLIGHT::B(G)+P(E)
- Refutation
- R(h);P_SPINR(h)
- Try
- Actual
- S(D);
- Vars
- K(e);P_SPINB(f),S_FLIGHT::QAB(A)
- R(g);N_GUARD,XP(B)::R1(C),XB(f)
- R(h);OGATE,P_SPINR(h),XP(E)::QAB1(A),XR(h)
- B(f);XB(G)::QAR1(A)
- R(h);SBLOCK,S_CUTB(f)::S(D)
- R(g);N_GUARD::R1(C),XB(f)
- R(h);SBLOCK::QAR1(A)
- B(f);::QAR1(A)
- B(f);SBLOCK,S_CUTR(h)::B(H)+P(E)
- S(a);N_GUARD::QAB(A),XS(a)
- S(a);N_GUARD::QAB(A)
- P(b);N_GUARD::QAB(A)
- P(c);::QAB1(A)
- P(i);SBLOCK::QAR1(A)
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).