MESON Chess Problem Database
Problem Display
PID: 152580 (1B6/1N5R/BPb1Pq2/pR6/p3kN1P/P7/5PPp/2nQ3K w - - 0 1)
Harley, Brian
The Observer, 1930
(First published on Sun Nov 16 1930)
#2
14 + 7
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qd4
- 2.Qf3#
- 1...Qxh4
- 2.Qxa4#
- 1...Qg5
- 2.Qxa4#
- 1...Qf5
- 2.Qxa4#
- 1...Qg6
- 2.Qxa4#
- 1...Qh6
- 2.Qxa4#
- 1...Qf7
- 2.Qxa4#
- 1...Bxb5
- 2.Qd5#
- 1...Bd5
- 2.Qxd5#
- 1...Bxb7
- 2.Bxb7#
- 1...Bd7
- 2.Qd5#
- 1...Be8
- 2.Qd5#
- 1...Sa2
- 2.Qd3#
- 1...Se2
- 2.Qd3#
- 1...Sb3
- 2.Qd3#
- 1...Sd3
- 2.Qxd3#
- 1...Qd4
- Tries
- 1.Se2?
- threat
- 2.Sg3#
- 2.Sd6#
- 1...Qxh4
- 2.Sc3#
- 2.Sd6#
- 2.Re5#
- 2.Rxh4#
- 2.Qd4#
- 1...Qxf2
- 2.Re5#
- 1...Qxe6
- 2.Sc3#
- 2.Sg3#
- 2.Qd4#
- 1...Bxb5
- 2.Sg3#
- 1...Bxb7
- 2.Sg3#
- 2.Bxb7#
- 1...Qe5
- 2.Rxe5#
- 1...Bd5
- 2.Sg3#
- 2.Qxd5#
- 1...Qc3
- 2.Sxc3#
- 2.Sd6#
- 1...Qd4
- 2.Sg3#
- 2.Qxd4#
- 1...Qg5
- 2.Sc3#
- 2.Sd6#
- 2.Qd4#
- 1...Qe7
- 2.Sc3#
- 2.Sg3#
- 2.Re5#
- 2.Qd4#
- 1...Qg7
- 2.Sd6#
- 1...Qd8
- 2.Sc3#
- 2.Sg3#
- 2.Re5#
- 1...Qf3
- 2.Sd6#
- 2.Re5#
- 2.Qd4#
- 1...Qf4
- 2.Sc3#
- 2.Qd4#
- 1...Qg6
- 2.Sc3#
- 2.Sd6#
- 2.Re5#
- 2.Qd4#
- 1...Qf8
- 2.Sc3#
- 2.Sg3#
- 2.Re5#
- 2.Qd4#
- 1...Sd3
- 2.Sd6#
- 1...Sxe2!
- threat
- 1.Qc2+?
- 1...Sd3
- 2.Qxd3#
- 1...Kd4!
- 1...Sd3
- 1.Qd2?
- threat
- 2.Sd6#
- 2.Qe3#
- 2.f3#
- 1...Qxe6
- 2.Qe3#
- 2.f3#
- 1...Bxb5
- 2.Qd5#
- 1...Bxb7
- 2.Bxb7#
- 2.Qe3#
- 2.f3#
- 1...Qe5
- 2.Rxe5#
- 1...Bd5
- 2.Qxd5#
- 1...Sd3
- 2.Qe3#
- 2.Qxd3#
- 1...Qc3
- 2.Sd6#
- 1...Qd4
- 2.f3#
- 1...Qe7
- 2.Re5#
- 2.Qe3#
- 2.f3#
- 1...Qd8
- 2.Re5#
- 2.Qe3#
- 2.f3#
- 1...Qf8
- 2.Re5#
- 2.Qe3#
- 2.f3#
- 1...Qxf4!
- threat
- 1.Se2?
- Keys
- 1.Rf7!
- 1...Qxh4
- 2.Sc5#
- 2.Sd6#
- 2.Re5#
- 2.Qxa4#
- 1...Qxf4
- 2.Sc5#
- 2.Rxf4#
- 1...Qxe6
- 2.Sc5#
- 1...Qxf7
- 2.Qxa4#
- 1...Bxb5
- 2.Qd5#
- 1...Bxb7
- 2.Bxb7#
- 1...Bd5
- 2.Qxd5#
- 1...Sd3
- 2.Qxd3#
- 1...Qc3
- 2.Sd6#
- 1...Qa1
- 2.Sc5#
- 2.Sd6#
- 1...Qb2
- 2.Sc5#
- 2.Sd6#
- 1...Qd4
- 2.Qf3#
- 1...Qe5
- 2.Rxe5#
- 1...Qg5
- 2.Sd6#
- 2.Qxa4#
- 1...Qe7
- 2.Re5#
- 1...Qg7
- 2.Sc5#
- 2.Sd6#
- 1...Qd8
- 2.Sc5#
- 2.Re5#
- 1...Qh8
- 2.Sc5#
- 2.Sd6#
- 1...Qf5
- 2.Qxa4#
- 1...Qg6
- 2.Sc5#
- 2.Sd6#
- 2.Re5#
- 2.Qxa4#
- 1...Qh6
- 2.Sc5#
- 2.Sd6#
- 2.Re5#
- 2.Qxa4#
- 1...Bd7
- 2.Qd5#
- 1...Be8
- 2.Qd5#
- 1...Sa2
- 2.Qd3#
- 1...Se2
- 2.Qd3#
- 1...Sb3
- 2.Qd3#
- 1...Qxh4
- 1.Rf7!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 4
- Sets
- Q(g);SBLOCK::QAB1(A)
- Q(g);N_GUARD,XP(G)::QAR(A),XP(c)
- Q(g);N_GUARD::QAR(A),XP(c)
- B(f);N_GUARD,XR(H)::QAB1(A)
- B(f);N_GUARD::QAB1(A),XB(f)
- B(f);OGATE,XS(L)::B(I),XB(f)
- B(f);N_GUARD::QAB1(A)
- S(a);N_GUARD::QAB1(A)
- S(a);N_GUARD::QAB1(A),XS(a)
- Tries
- Try
- S(F);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XP(C)::R1(H)
- B(f);XR(H)::S(F)
- Q(g);N_GUARD::R1(H),XQ(g)
- Q(g);::S(L)
- S(a);::S(L)
- Refutation
- S(a);XS(F)
- Try
- Q(A);CHECK
- Vars
- S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
- Refutation
- K(d);P-FLIGHT,P_PINP(D)
- Try
- Q(A);
- Threat
- DUALS(3)
- Vars
- B(f);N_GUARD,XR(H)::QAB1(A)
- Q(g);N_GUARD::R1(H),XQ(g)
- B(f);N_GUARD::QAB1(A),XB(f)
- Q(g);::S(L)
- Q(g);::P(C)
- Refutation
- Q(g);XS(F)
- Try
- Actual
- R(M);
- Vars
- Q(g);XP(K)::S(L)
- Q(g);N_GUARD,XR(M)::QAR(A),XP(c)
- B(f);N_GUARD,XR(H)::QAB1(A)
- B(f);OGATE,XS(L)::B(I),XB(f)
- B(f);N_GUARD::QAB1(A),XB(f)
- S(a);N_GUARD::QAB1(A),XS(a)
- Q(g);::S(L)
- Q(g);SBLOCK::QAB1(A)
- Q(g);N_GUARD::R1(H),XQ(g)
- Q(g);N_GUARD::R1(H)
- Q(g);N_GUARD::QAR(A),XP(c)
- B(f);N_GUARD::QAB1(A)
- S(a);N_GUARD::QAB1(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).