MESON Chess Problem Database
Problem Display
PID: 269420 (3r4/2Q5/NP4N1/5p2/R1qk3b/3nr1p1/b1nK2B1/6B1 w - - 0 1)
Stevenson, Edward
The Observer, 1958
(First published on Sun Feb 2 1958)
#2
8 + 10
| 17397 | Ling Notebooks | 2023 |
SOLUTION
- SOUND
- Sets
- 1...Qxa4
- 2.Qc3#
- 1...Qb4+
- 2.Qc3#
- 1...Rd6
- 2.Qxd6#
- 1...Rd7
- 2.Qxd7#
- 1...Ra8
- 2.Qd6#
- 2.Qd7#
- 1...Rb8
- 2.Qd6#
- 2.Qd7#
- 1...Rc8
- 2.Qd6#
- 2.Qd7#
- 1...Re8
- 2.Qd6#
- 2.Qd7#
- 1...Rf8
- 2.Qd6#
- 2.Qd7#
- 1...Rg8
- 2.Qd6#
- 2.Qd7#
- 1...Rh8
- 2.Qd6#
- 2.Qd7#
- 1...Bb1
- 2.Rxc4#
- 2.Qxc4#
- 1...Sa1
- 2.Bxe3#
- 1...Sce1
- 2.Bxe3#
- 1...Sa3
- 2.Bxe3#
- 1...Scb4
- 2.Bxe3#
- 1...Sc1
- 2.Qf4#
- 2.Qe5#
- 2.Qc5#
- 1...Sde1
- 2.Qf4#
- 2.Qe5#
- 2.Qc5#
- 1...Sb2
- 2.Qf4#
- 2.Qe5#
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sdb4
- 2.Qf4#
- 2.Qe5#
- 1...Sf4
- 2.Qxf4#
- 2.Qe5#
- 2.Qc5#
- 1...Sc5
- 2.Qe5#
- 2.Qxc5#
- 1...Se5
- 2.Qxe5#
- 2.Qc5#
- 1...Qxa4
- Tries
- 1.Sf4?
- threat
- 2.Se2#
- 2.Se6#
- 1...Qb4+
- 2.Qc3#
- 1...Qxa4
- 2.Se2#
- 2.Qc3#
- 1...Sxf4
- 2.Qxf4#
- 2.Qc5#
- 1...Rd6
- 2.Qxd6#
- 1...Re8
- 2.Se2#
- 2.Qd6#
- 1...Scb4
- 2.Se2#
- 2.Bxe3#
- 1...Sc1
- 2.Se6#
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sc5
- 2.Se2#
- 2.Qxc5#
- 1...Sdb4!
- threat
- 1.Sxh4?
- threat
- 2.Sxf5#
- 1...Qb4+
- 2.Qc3#
- 1...Rd6
- 2.Qxd6#
- 1...Rf8
- 2.Qd6#
- 1...f4
- 2.Sf5#
- 1...Rd5!
- threat
- 1.Se5?
- threat
- 2.Sc6#
- 1...Qb4+
- 2.Qc3#
- 1...Qxa4
- 2.Qc3#
- 1...Sxe5
- 2.Qc5#
- 1...Rd6
- 2.Qxd6#
- 1...Scb4
- 2.Bxe3#
- 1...Sdb4!
- threat
- 1.Se7?
- threat
- 2.Sxf5#
- 2.Sc6#
- 1...Qb4+
- 2.Qc3#
- 1...Qxa4
- 2.Sxf5#
- 2.Qc3#
- 1...Rd6
- 2.Qxd6#
- 1...Rd5
- 2.Sc6#
- 1...Rf8
- 2.Sc6#
- 2.Qd6#
- 1...Scb4
- 2.Sxf5#
- 2.Bxe3#
- 1...Sdb4
- 2.Sxf5#
- 2.Qf4#
- 1...Se5
- 2.Sxf5#
- 2.Qc5#
- 1...f4
- 2.Sf5#
- 2.Sc6#
- 1...Bxe7!
- threat
- 1.Qg7+?
- 1...Se5
- 2.Qxe5#
- 1...Bf6!
- 1...Se5
- 1.Sf4?
- Keys
- 1.Sf8!
- threat
- 2.Se6#
- 1...Qb4+
- 2.Qc3#
- 1...Qxa4
- 2.Qc3#
- 1...Rxf8
- 2.Qd6#
- 1...Rd6
- 2.Qxd6#
- 1...Re8
- 2.Qd6#
- 1...Scb4
- 2.Bxe3#
- 1...Sf2
- 2.Qc5#
- 1...Sdb4
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- threat
- 1.Sf8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 4
- Sets
- Q(f);N_SPINQ(f),OGATE,XR(D)::QAB1(H)
- Q(f);CHECK,OGATE::QAB1(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- R(j);N_GUARD::QAR(H),XR(j)
- S(b);N_GUARD::B(A),XR(d)
- S(b);N_GUARD,N_SPINQ(f)::B(A),XR(d)
- S(c);N_GUARD,N_SPINR(d)::QAB1(H)
- Tries
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(f);CHECK,OGATE::QAB1(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- S(c);N_GUARD,N_SPINR(d)::QAB1(H)
- Refutation
- S(c);N_SPINQ(f)
- Try
- S(G);XB(h)
- Threat
- S(G),XP(i)
- Vars
- Q(f);CHECK,OGATE::QAB1(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- R(j);N_GUARD::QAR2(H)
- P(i);::S(G)
- Refutation
- R(j);
- Try
- S(G);
- Threat
- S(G)
- Vars
- Q(f);CHECK,OGATE::QAB1(H)
- Q(f);N_SPINQ(f),OGATE,XR(D)::QAB1(H)
- S(c);N_GUARD,XS(G)::QAB1(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- S(b);N_GUARD,N_SPINQ(f)::B(A),XR(d)
- Refutation
- S(c);N_SPINQ(f)
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(f);CHECK,OGATE::QAB1(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- R(j);::S(G)
- Refutation
- B(h);XS(G)
- Try
- Q(H);CHECK
- Vars
- S(c);N_GUARD,P_SPINS(c)::QAB1(H),XS(c)
- Refutation
- B(h);P_SPINB(h)
- Try
- Actual
- S(G);
- Threat
- S(G)
- Vars
- Q(f);CHECK,OGATE::QAB1(H)
- Q(f);N_SPINQ(f),OGATE,XR(D)::QAB1(H)
- R(j);N_GUARD,XS(G)::QAR2(H)
- R(j);N_GUARD::QAR2(H),XR(j)
- R(j);N_GUARD::QAR2(H)
- S(b);N_GUARD,N_SPINQ(f)::B(A),XR(d)
- S(c);N_GUARD,N_SPINR(d)::QAB1(H)
- S(c);N_GUARD,N_SPINQ(f)::QAR2(H)
- S(c);N_GUARD::QAB1(H),XS(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).