MESON Chess Problem Database
Problem Display
PID: 153688 (K1R5/R2p4/1p2N1B1/BkN5/8/PP6/8/q1n5 w - - 0 1)
Harley, Brian
The Observer, 1946
(First published on Sun Nov 3 1946)
#2
9 + 5
| 15290 | Harley Scrapbook | 2015 |
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Qxa3
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sxb3
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...bxa5
- 2.Rb7#
- 1...bxc5
- 2.Rxc5#
- 1...dxe6
- 2.Be8#
- 1...d5
- 2.Be8#
- 1...d6
- 2.Be8#
- 1...Qb2
- Tries
- 1.Kb7?
- 1...Qxa3
- 2.Sd4#
- 1...Sxb3
- 2.Bd3#
- 1...bxc5
- 2.Sc7#
- 2.Rxc5#
- 1...dxe6
- 2.Be8#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...d5
- 2.Be8#
- 1...d6
- 2.Be8#
- 1...bxa5!
- 1...Qxa3
- 1.Kb8?
- 1...Qxa3
- 2.Sd4#
- 1...Sxb3
- 2.Bd3#
- 1...bxa5
- 2.Rb7#
- 1...bxc5
- 2.Rxc5#
- 1...dxe6
- 2.Be8#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...d5
- 2.Be8#
- 1...d6
- 2.Be8#
- 1...Qe5+!
- 1...Qxa3
- 1.Sxd7?
- 1...Qxa3
- 2.Sd4#
- 1...bxa5
- 2.Rc5#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...Sxb3!
- 1...Qxa3
- 1.Bh5?
- 1...Qxa3
- 2.Sd4#
- 1...Sxb3
- 2.Be2#
- 1...bxa5
- 2.Rb7#
- 1...bxc5
- 2.Rxc5#
- 1...dxe6
- 2.Be8#
- 1...d5
- 2.Be8#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Be2#
- 2.a4#
- 1...Se2
- 2.Bxe2#
- 1...d6
- 2.Be8#
- 1...Sd3!
- 1...Qxa3
- 1.Be8?
- threat
- 2.Bxd7#
- 1...bxa5
- 2.Rb7#
- 1...Qd4
- 2.Sxd4#
- 1...Qg7
- 2.a4#
- 1...Sxb3!
- threat
- 1.Rcc7?
- 1...Qxa3
- 2.Sd4#
- 1...Sxb3
- 2.Bd3#
- 1...bxa5
- 2.Rab7#
- 1...bxc5
- 2.Rxc5#
- 1...dxe6
- 2.Be8#
- 1...d5
- 2.Be8#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...d6
- 2.Be8#
- 1...Qh8+!
- 1...Qxa3
- 1.Kb7?
- Keys
- 1.Ra6!
- 1...Qxa3
- 2.Sd4#
- 1...Sxb3
- 2.Bd3#
- 1...bxa5
- 2.Rb8#
- 1...bxc5
- 2.Sc7#
- 1...dxe6
- 2.Be8#
- 1...d5
- 2.Be8#
- 1...Qb2
- 2.a4#
- 1...Qc3
- 2.a4#
- 1...Qd4
- 2.Sxd4#
- 1...Qe5
- 2.a4#
- 1...Qf6
- 2.a4#
- 1...Qg7
- 2.a4#
- 1...Qh8
- 2.a4#
- 1...Qb1
- 2.Sd4#
- 2.a4#
- 1...Qa2
- 2.Sd4#
- 1...Sa2
- 2.Bd3#
- 2.a4#
- 1...Se2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...d6
- 2.Be8#
- 1...Qxa3
- 1.Ra6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD,P_PINR(I)::P(A)
- Q(a);N_GUARD::S(E)
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD,XP(B)::B(F)
- S(b);N_GUARD::B(F),XS(b)
- P(d);OGATEB,SBLOCK,XB(C)::R(G)
- P(d);OGATE,XS(D)::R1(I),XP(d)
- P(e);OGATEB,XS(E)::B(F)
- P(e);OGATEB::B(F)
- Tries
- Try
- K(H);S_FLIGHT
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD,XP(B)::B(F)
- P(e);OGATEB,XS(E)::B(F)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD::B(F),XS(b)
- P(e);OGATEB::B(F)
- Refutation
- P(d);XB(C)
- Try
- K(H);P-FLIGHT
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD,XP(B)::B(F)
- P(d);OGATEB,SBLOCK,XB(C)::R(G)
- P(d);OGATE,XS(D)::R1(I),XP(d)
- P(e);OGATEB,XS(E)::B(F)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD,P_PINR(I)::P(A)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD::B(F),XS(b)
- P(e);OGATEB::B(F)
- Refutation
- Q(a);CHECK
- Try
- S(D);XP(e)
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- P(d);N_GUARD,XB(C)::R1(I)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD,P_PINR(I)::P(A)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD::B(F),XS(b)
- Refutation
- S(b);XP(B)
- Try
- B(F);
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD,XP(B)::B(F)
- P(d);OGATEB,SBLOCK,XB(C)::R(G)
- P(d);OGATE,XS(D)::R1(I),XP(d)
- P(e);OGATEB,XS(E)::B(F)
- P(e);OGATEB::B(F)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD,P_PINR(I)::P(A)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F),XS(b)
- Refutation
- S(b);
- Try
- B(F);P_PINP(e)
- Threat
- B(F),XP(e)
- Vars
- P(d);OGATEB,SBLOCK,XB(C)::R(G)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD::P(A)
- Refutation
- S(b);XP(B)
- Try
- R(I);
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD,XP(B)::B(F)
- P(d);OGATEB,SBLOCK,XB(C)::R(G)
- P(d);OGATE,XS(D)::R1(I),XP(d)
- P(e);OGATEB,XS(E)::B(F)
- P(e);OGATEB::B(F)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD::B(F),XS(b)
- Refutation
- Q(a);CHECK
- Try
- Actual
- R(G);
- Vars
- Q(a);N_GUARD,XP(A)::S(E)
- S(b);N_GUARD,XP(B)::B(F)
- P(d);OGATEB,XB(C)::R(I)
- P(d);SBLOCK,XS(D)::S(E)
- P(e);OGATEB,XS(E)::B(F)
- P(e);OGATEB::B(F)
- Q(a);N_GUARD::P(A)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD,P_PINR(I)::P(A)
- Q(a);N_GUARD::S(E)
- S(b);N_GUARD::B(F)
- S(b);N_GUARD::B(F),XS(b)
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).