MESON Chess Problem Database
Problem Display
PID: 153497 (2NR2br/5k1p/7p/2n1P2P/6QN/8/K7/8 w - - 0 1)
Harley, Brian
The Observer, 1943
(First published on Sun Feb 7 1943)
#2
7 + 6
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Sb3
- Tries
- 1.Kb1?
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Se6!
- 1...Sb3
- 1.Ka3?
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Se6!
- 1...Sb3
- 1.Sg2?
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Se6!
- 1...Sb3
- 1.Sf3?
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Se6!
- 1...Sb3
- 1.Sf5?
- threat
- 2.Sfd6#
- 2.Sxh6#
- 1...Se4
- 2.Sxh6#
- 1...Sb7
- 2.Sxh6#
- 2.Qc4#
- 1...Ke6!
- threat
- 1.Sg6?
- threat
- 2.Sxh8#
- 1...hxg6
- 2.Qxg6#
- 1...Kg7+!
- threat
- 1.Re8?
- threat
- 2.Sd6#
- 1...Se4
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Kxe8+!
- threat
- 1.Qf3+?
- 1...Ke6
- 2.Qd5#
- 2.Qf5#
- 2.Qf6#
- 1...Kg7+!
- 1...Ke6
- 1.Qc4+?
- 1...Kg7
- 2.Sf5#
- 1...Se6!
- 1...Kg7
- 1.Qf4+?
- 1...Ke6
- 2.Rd6#
- 2.Qf5#
- 2.Qf6#
- 1...Kg7+!
- 1...Ke6
- 1.Qg5?
- threat
- 2.Qf6#
- 2.Qe7#
- 1...Ke6
- 2.Qf6#
- 2.Qe7#
- 2.Qf5#
- 1...Se4
- 2.Qe7#
- 1...Sd7
- 2.Qe7#
- 1...hxg5!
- threat
- 1.Qg7+?
- 1...Ke6
- 2.Rd6#
- 2.Qf6#
- 2.Qe7#
- 1...Kxg7+!
- 1...Ke6
- 1.Kb1?
- Keys
- 1.Qd4!
- 1...Kg7+
- 2.e6#
- 1...Ke6
- 2.Qd5#
- 1...Se6
- 2.Qd7#
- 1...Sb3
- 2.Qd7#
- 1...Sd3
- 2.Qd7#
- 1...Sa4
- 2.Qd7#
- 1...Se4
- 2.Qd7#
- 1...Sa6
- 2.Qd7#
- 1...Sb7
- 2.Qd7#
- 1...Sd7
- 2.Qxd7#
- 1...Kg7+
- 1.Qd4!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- Tries
- Try
- K(A);S_FLIGHT
- Vars
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- Refutation
- S(a);
- Try
- K(A);P-FLIGHT
- Vars
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- Refutation
- S(a);
- Try
- S(C);
- Vars
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- Refutation
- S(a);
- Try
- S(C);
- Vars
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- Refutation
- S(a);
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- S(a);::S(C),XP(b)
- Refutation
- K(c);S_FLIGHT
- Try
- S(C);
- Threat
- S(C),XR(f)
- Vars
- P(d);OGATE,XS(C)::QAB1(B),XP(d)
- Refutation
- K(c);CHECK,P-FLIGHT
- Try
- R(G);
- Threat
- S(F)
- Vars
- S(a);N_GUARD::QAR2(B)
- Refutation
- K(c);CHECK,S_FLIGHT,XR(G)
- Try
- Q(B);CHECK
- Refutation
- K(c);CHECK,P-FLIGHT
- Try
- Q(B);CHECK
- Vars
- K(c);P-FLIGHT,P_PINQ(B)::S(C)
- Refutation
- S(a);P_SPINS(a)
- Try
- Q(B);CHECK
- Refutation
- K(c);CHECK,P-FLIGHT
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- S(a);::QAR1(B)
- Refutation
- P(b);XQ(B)
- Try
- Q(B);CHECK
- Refutation
- K(c);CHECK,P-FLIGHT,XQ(B)
- Try
- Actual
- Q(B);
- Vars
- K(c);CHECK,P-FLIGHT::QAB(B)+P(D)
- K(c);S_FLIGHT::QAB1(B)
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(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).