MESON Chess Problem Database
Problem Display
PID: 343 (6R1/K5Nq/8/7p/7p/4B1kp/3pQ3/3B3n w - - 0 1)
Andrade, Barry Jack da Costa
Harley, Brian
The Observer, 1927
(First published on Sun Jul 3 1927)
#2
6 + 7
| 1077 | Boletim da UBP | 1987 |
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qb1
- 2.Sf5#
- 2.Sxh5#
- 1...Qc2
- 2.Sf5#
- 2.Sxh5#
- 1...Qd3
- 2.Sf5#
- 2.Sxh5#
- 1...Qe4
- 2.Sf5#
- 2.Sxh5#
- 1...Qf5
- 2.Sxf5#
- 2.Sxh5#
- 1...Qg6
- 2.Sf5#
- 2.Sxh5#
- 1...Qxg8
- 2.Sf5#
- 2.Sxh5#
- 1...Qh6
- 2.Sf5#
- 2.Sxh5#
- 1...Qxg7+
- 2.Rxg7#
- 1...Qh8
- 2.Sf5#
- 2.Sxh5#
- 1...Sf2
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 1...Qb1
- Tries
- 1.Bg1?
- threat
- 2.Bh2#
- 2.Qf3#
- 2.Qh2#
- 1...Kf4
- 2.Qe3#
- 1...Sf2
- 2.Qf3#
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 2.Qxh2#
- 1...Qd3
- 2.Sxh5#
- 2.Bh2#
- 2.Qh2#
- 1...Qe4
- 2.Sxh5#
- 2.Bh2#
- 2.Qh2#
- 1...Qf5
- 2.Sxh5#
- 2.Bh2#
- 2.Qh2#
- 1...Qxg7+!
- threat
- 1.Bxd2?
- 1...Qxg7+
- 2.Rxg7#
- 1...Qxg8
- 2.Sf5#
- 2.Sxh5#
- 1...h2
- 2.Qf3#
- 1...Qb1
- 2.Sf5#
- 2.Sxh5#
- 1...Qc2
- 2.Sf5#
- 2.Sxh5#
- 1...Qd3
- 2.Sf5#
- 2.Sxh5#
- 1...Qe4
- 2.Sf5#
- 2.Sxh5#
- 1...Qf5
- 2.Sxf5#
- 2.Sxh5#
- 1...Qg6
- 2.Sf5#
- 2.Sxh5#
- 1...Qh6
- 2.Sf5#
- 2.Sxh5#
- 1...Qh8
- 2.Sf5#
- 2.Sxh5#
- 1...Sf2!
- 1...Qxg7+
- 1.Bd4?
- threat
- 2.Be5#
- 1...Kf4
- 2.Qe3#
- 2.Qe5#
- 1...Sf2
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 1...Qe4
- 2.Sxh5#
- 1...Qf5
- 2.Sxh5#
- 1...Qh6
- 2.Sxh5#
- 1...Qxg7+!
- threat
- 1.Bc5?
- threat
- 2.Bd6#
- 1...Kf4
- 2.Qe3#
- 1...Sf2
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 1...Qd3
- 2.Sxh5#
- 1...Qe4
- 2.Sxh5#
- 1...Qf5
- 2.Sxh5#
- 1...Qg6
- 2.Sxh5#
- 1...Qh6
- 2.Sxh5#
- 1...Qxg7+!
- threat
- 1.Bh6?
- 1...Qxg7+
- 2.Rxg7#
- 1...Qxg8
- 2.Sf5#
- 2.Sxh5#
- 1...Qxh6
- 2.Sxh5#
- 1...h2
- 2.Qf3#
- 1...Qb1
- 2.Sf5#
- 2.Sxh5#
- 1...Qc2
- 2.Sf5#
- 2.Sxh5#
- 1...Qd3
- 2.Sf5#
- 2.Sxh5#
- 1...Qe4
- 2.Sf5#
- 2.Sxh5#
- 1...Qf5
- 2.Sxf5#
- 2.Sxh5#
- 1...Qg6
- 2.Sf5#
- 2.Sxh5#
- 1...Qh8
- 2.Sf5#
- 2.Sxh5#
- 1...Sf2!
- 1...Qxg7+
- 1.Rf8?
- threat
- 2.Bf4#
- 1...Sf2
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 1...Qe4
- 2.Sxh5#
- 1...Qf5
- 2.Sxf5#
- 1...Qh6
- 2.Sf5#
- 1...Qxg7+!
- threat
- 1.Qg4+?
- 1...Kh2
- 2.Bg1#
- 2.Qg1#
- 1...hxg4!
- 1...Kh2
- 1.Qxd2?
- threat
- 2.Bf4#
- 1...Qxg7+
- 2.Rxg7#
- 1...Sf2
- 2.Qxf2#
- 1...Qe4
- 2.Sf5#
- 2.Sxh5#
- 1...Qf5
- 2.Sxf5#
- 2.Sxh5#
- 1...Qh6
- 2.Sf5#
- 2.Sxh5#
- 1...h2!
- threat
- 1.Bg1?
- Keys
- 1.Bb6!
- threat
- 2.Bc7#
- 1...Kf4
- 2.Qe3#
- 1...Sf2
- 2.Qxf2#
- 1...h2
- 2.Qf3#
- 1...Qc2
- 2.Sxh5#
- 1...Qd3
- 2.Sxh5#
- 1...Qe4
- 2.Sxh5#
- 1...Qf5
- 2.Sxh5#
- 1...Qg6
- 2.Sxh5#
- 1...Qh6
- 2.Sxh5#
- threat
- 1.Bb6!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 0
- ADDED MATES = 7
- REMOVED MATES = 1
- Sets
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(E)::R(F),XQ(g)
- S(a);N_GUARD::QAB1(B),XS(a)
- P(d);SBLOCK::QAR1(B)
- Tries
- Try
- B(C);
- Threat
- DUALS(3)
- Vars
- K(c);S_FLIGHT::QAB1(B)
- Refutation
- Q(g);CHECK,P_SPINQ(g),XS(E)
- Try
- B(C);XP(b)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(E)::R(F),XQ(g)
- P(d);SBLOCK::QAR1(B)
- Refutation
- S(a);
- Try
- B(C);
- Threat
- B(C)
- Vars
- S(a);N_GUARD::QAB1(B),XS(a)
- P(d);SBLOCK::QAR1(B)
- Q(g);N_PINS(E)::R(F)+S(E),DCHECK,XP(f)
- Refutation
- Q(g);CHECK,P_SPINQ(g),XS(E)
- Try
- B(C);
- Threat
- B(C)
- Vars
- K(c);S_FLIGHT::QAB1(B)
- S(a);N_GUARD::QAB1(B),XS(a)
- P(d);SBLOCK::QAR1(B)
- Q(g);N_PINS(E)::R(F)+S(E),DCHECK,XP(f)
- Q(g);N_PINS(E)::S(E),XP(f)
- Refutation
- Q(g);CHECK,P_SPINQ(g),XS(E)
- Try
- B(C);
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(E)::R(F),XQ(g)
- Q(g);N_PINS(E),XB(C)::R(F)+S(E),DCHECK,XP(f)
- P(d);SBLOCK::QAR1(B)
- Refutation
- S(a);
- Try
- R(F);
- Threat
- B(C)
- Vars
- S(a);N_GUARD::QAB1(B),XS(a)
- P(d);SBLOCK::QAR1(B)
- Q(g);N_PINS(E)::S(E),XP(f)
- Q(g);N_PINS(E)::S(E),XQ(g)
- Q(g);N_PINS(E)::S(E)
- Refutation
- Q(g);CHECK,XS(E)
- Try
- Q(B);CHECK
- Refutation
- P(f);XQ(B)
- Try
- Q(B);XP(b)
- Threat
- B(C)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(E)::R(F),XQ(g)
- S(a);N_GUARD::QAB1(B),XS(a)
- Refutation
- P(d);
- Try
- Actual
- B(C);
- Threat
- B(C)
- Vars
- K(c);S_FLIGHT::QAB1(B)
- S(a);N_GUARD::QAB1(B),XS(a)
- P(d);SBLOCK::QAR1(B)
- Q(g);N_PINS(E)::R(F)+S(E),DCHECK,XP(f)
- Q(g);N_PINS(E)::S(E),XP(f)
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).