MESON Chess Problem Database
Problem Display
PID: 152334 (2N2B2/3pp3/7p/1p1k1BbR/bK4P1/1nQ1p3/4N3/8 w - - 0 1)
Harley, Brian
The Observer, 1923
(First published on Sun Oct 21 1923)
#2
8 + 9
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Bf4
- 2.Sxf4#
- 1...Bh4
- 2.Sf4#
- 1...Bf6
- 2.Sf4#
- 1...Sa1
- 2.Qc5#
- 1...Sc1
- 2.Qc5#
- 1...Sd2
- 2.Qc5#
- 1...Sd4
- 2.Qc5#
- 1...Sa5
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...d6
- 2.Sb6#
- 1...e5
- 2.Sb6#
- 1...e6
- 2.Sb6#
- 1...Bf4
- Tries
- 1.Bxe7?
- threat
- 2.Sb6#
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Bxe7+!
- threat
- 1.Rh1?
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Bf4
- 2.Sxf4#
- 1...Bh4
- 2.Sf4#
- 1...Bf6
- 2.Sf4#
- 1...Sa1
- 2.Qc5#
- 1...Sc1
- 2.Qc5#
- 1...Sd2
- 2.Qc5#
- 1...Sa5
- 2.Qc5#
- 1...d6
- 2.Sb6#
- 1...e5
- 2.Sb6#
- 1...e6
- 2.Sb6#
- 1...h5!
- 1...Sd4
- 1.Rh2?
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Bf4
- 2.Sxf4#
- 1...Bh4
- 2.Sf4#
- 1...Bf6
- 2.Sf4#
- 1...Sa1
- 2.Qc5#
- 1...Sc1
- 2.Qc5#
- 1...Sd2
- 2.Qc5#
- 1...Sa5
- 2.Qc5#
- 1...d6
- 2.Sb6#
- 1...e5
- 2.Sb6#
- 1...e6
- 2.Sb6#
- 1...h5!
- 1...Sd4
- 1.Rh3?
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Bf4
- 2.Sxf4#
- 1...Bh4
- 2.Sf4#
- 1...Bf6
- 2.Sf4#
- 1...Sa1
- 2.Qc5#
- 1...Sc1
- 2.Qc5#
- 1...Sd2
- 2.Qc5#
- 1...Sa5
- 2.Qc5#
- 1...d6
- 2.Sb6#
- 1...e5
- 2.Sb6#
- 1...e6
- 2.Sb6#
- 1...h5!
- 1...Sd4
- 1.Rh4?
- 1...Bxh4
- 2.Sf4#
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Bf4
- 2.Sxf4#
- 1...Bf6
- 2.Sf4#
- 1...Sa1
- 2.Qc5#
- 1...Sc1
- 2.Qc5#
- 1...Sd2
- 2.Qc5#
- 1...Sa5
- 2.Qc5#
- 1...d6
- 2.Sb6#
- 1...e5
- 2.Sb6#
- 1...e6
- 2.Sb6#
- 1...h5!
- 1...Bxh4
- 1.Rxg5?
- threat
- 2.Sf4#
- 1...Sd4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...e5
- 2.Sb6#
- 1...hxg5!
- threat
- 1.Rxh6?
- threat
- 2.Sb6#
- 1...Sd4
- 2.Qxd4#
- 2.Qc5#
- 1...Bf6
- 2.Sf4#
- 1...Bxh6!
- threat
- 1.Qd4+?
- 1...Kc6
- 2.Qxd7#
- 1...Sxd4!
- 1...Kc6
- 1.Qc2?
- threat
- 2.Qe4#
- 1...Sc5
- 2.Qxc5#
- 1...Sd2
- 2.Qc5#
- 1...Ke5!
- threat
- 1.Qd3+?
- 1...Kc6
- 2.Qxd7#
- 1...Sd4
- 2.Qe4#
- 1...Ke5!
- 1...Kc6
- 1.Bxe7?
- Keys
- 1.Bxd7!
- 1...Ke4
- 2.Bc6#
- 1...Sd4
- 2.Qxd4#
- 1...Sa1
- 2.Qd4#
- 1...Sc1
- 2.Qd4#
- 1...Sd2
- 2.Qd4#
- 1...Sa5
- 2.Qd4#
- 1...Sc5
- 2.Qd4#
- 1...e5
- 2.Qc6#
- 1...e6
- 2.Bc6#
- 1...Ke4
- 1.Bxd7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 1
- REMOVED MATES = 4
- Sets
- B(f);N_GUARD::S(A),XB(f)
- B(f);N_GUARD::S(A)
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- P(h);SBLOCK::S(G)
- P(i);::S(G)
- Tries
- Try
- B(H);XP(i)
- Threat
- S(G)
- Vars
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- Refutation
- B(f);CHECK,XB(H)
- Try
- R(F);
- Vars
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- B(f);N_GUARD::S(A),XB(f)
- B(f);N_GUARD::S(A)
- P(h);SBLOCK::S(G)
- P(i);::S(G)
- Refutation
- P(g);
- Try
- R(F);
- Vars
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- B(f);N_GUARD::S(A),XB(f)
- B(f);N_GUARD::S(A)
- P(h);SBLOCK::S(G)
- P(i);::S(G)
- Refutation
- P(g);
- Try
- R(F);
- Vars
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- B(f);N_GUARD::S(A),XB(f)
- B(f);N_GUARD::S(A)
- P(h);SBLOCK::S(G)
- P(i);::S(G)
- Refutation
- P(g);
- Try
- R(F);
- Vars
- B(f);N_GUARD,XR(F)::S(A)
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- B(f);N_GUARD::S(A),XB(f)
- B(f);N_GUARD::S(A)
- P(h);SBLOCK::S(G)
- P(i);::S(G)
- Refutation
- P(g);
- Try
- R(F);XB(f)
- Threat
- S(A)
- Vars
- S(a);N_GUARD::QAR1(B)
- S(a);N_GUARD::QAR1(B),XS(a)
- P(i);::S(G)
- Refutation
- P(g);XR(F)
- Try
- R(F);XP(g)
- Threat
- S(G)
- Vars
- B(f);N_GUARD::S(A)
- Refutation
- B(f);XR(F)
- Try
- Q(B);CHECK
- Vars
- K(e);OGATE,S_FLIGHT::QAB1(B),XP(h)
- Refutation
- S(a);XQ(B)
- Try
- Q(B);
- Threat
- QAB1(B)
- Vars
- S(a);N_GUARD::QAR1(B),XS(a)
- S(a);N_GUARD::QAR1(B)
- Refutation
- K(e);P-FLIGHT
- Try
- Q(B);CHECK
- Vars
- K(e);OGATE,S_FLIGHT::QAB1(B),XP(h)
- S(a);P_SPINS(a)::QAB1(B)
- Refutation
- K(e);P-FLIGHT
- Try
- Actual
- B(E);P_PINB(f),XP(h)
- Vars
- K(e);N_SPINB(f),S_FLIGHT::B(E)
- S(a);N_GUARD::QAR1(B),XS(a)
- S(a);N_GUARD::QAR1(B)
- P(i);N_SPINB(f),SBLOCK::QAB1(B)
- P(i);SBLOCK::B(E)
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).