MESON Chess Problem Database
Problem Display
PID: 153610 (8/7B/8/np5Q/b1p5/4K1p1/1p6/1rk5 w - - 0 1)
Harley, Brian
The Observer, 1944
(First published on Sun Sep 3 1944)
#2
3 + 8
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Sb3
- 2.Qh1#
- 1...Sb3
- Tries
- 1.Ke2?
- threat
- 2.Qg5#
- 2.Qh6#
- 1...Sb3
- 2.Qh1#
- 1...Bd1+!
- threat
- 1.Qe2?
- threat
- 2.Qd2#
- 1...Sb3
- 2.Qf1#
- 2.Qe1#
- 2.Qc2#
- 1...c3!
- threat
- 1.Qg6?
- threat
- 2.Qxb1#
- 1...Kd1
- 2.Qxb1#
- 1...Bc2
- 2.Qxc2#
- 1...Ra1!
- threat
- 1.Qd5?
- threat
- 2.Qd2#
- 1...Sb3
- 2.Qh1#
- 1...c3!
- threat
- 1.Qf5?
- threat
- 2.Qxb1#
- 1...Kd1
- 2.Qxb1#
- 2.Qf1#
- 1...Bc2
- 2.Qxc2#
- 1...Ra1!
- threat
- 1.Ke2?
- Keys
- 1.Qh6!
- threat
- 2.Ke2#
- 1...Kd1
- 2.Qh1#
- 1...Bd1
- 2.Kd4#
- 1...Sb3
- 2.Qh1#
- threat
- 1.Qh6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- S(g);S_CUTB(e)::QAR(B)
- Tries
- Try
- K(A);P-FLIGHT
- Threat
- DUALS(2)
- Vars
- S(g);S_CUTB(e)::QAR(B)
- Refutation
- B(e);CHECK
- Try
- Q(B);
- Threat
- QAB1(B)
- Refutation
- P(f);
- Try
- Q(B);
- Threat
- QAR1(B),XR(a)
- Vars
- K(b);P-FLIGHT::QAR2(B),XR(a)
- B(e);N_GUARD::QAR1(B),XB(e)
- Refutation
- R(a);
- Try
- Q(B);
- Threat
- QAB1(B)
- Vars
- S(g);S_CUTB(e)::QAR(B)
- Refutation
- P(f);
- Try
- Q(B);
- Threat
- QAR1(B),XR(a)
- Vars
- B(e);N_GUARD::QAR1(B),XB(e)
- Refutation
- R(a);
- Try
- Actual
- Q(B);
- Threat
- QAB(B)+K(A)
- Vars
- K(b);P-FLIGHT::QAR(B)
- B(e);SBLOCK::QAB(B)+K(A)
- S(g);S_CUTB(e)::QAR(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).