MESON Chess Problem Database
Problem Display
PID: 163446 (1Q6/8/4b3/1Bp1N3/1p2p3/p2qp1B1/R1P1k1n1/1NR4K w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1925
(First published on Sun Jul 5 1925)
#2
9 + 9
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qc4
- 2.c3#
- 1...Qxb5
- 2.c4#
- 1...Bb3
- 2.cxb3#
- 1...Bh3
- 2.cxd3#
- 2.c3#
- 1...Bg4
- 2.cxd3#
- 2.c3#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Bd7
- 2.cxd3#
- 2.c3#
- 1...Bc8
- 2.cxd3#
- 2.c3#
- 1...Se1
- 2.Rxe1#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...b3
- 2.cxb3#
- 1...c4
- 2.cxd3#
- 1...Qc4
- Tries
- 1.Qe8?
- 1...Qxb5
- 2.c4#
- 1...Bxa2
- 2.Qh5#
- 1...Se1
- 2.Rxe1#
- 1...Bc4
- 2.Qh5#
- 1...Qc4
- 2.c3#
- 1...Bb3
- 2.Qh5#
- 2.cxb3#
- 1...Bh3
- 2.cxd3#
- 2.c3#
- 1...Bg4
- 2.cxd3#
- 2.c3#
- 1...Bd5
- 2.Qh5#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Bd7
- 2.cxd3#
- 2.c3#
- 1...Bc8
- 2.cxd3#
- 2.c3#
- 1...Bg8
- 2.Qh5#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...b3
- 2.cxb3#
- 1...c4
- 2.cxd3#
- 1...Bf7!
- 1...Qxb5
- 1.Qf8?
- threat
- 2.Qf1#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Se1
- 2.Rxe1#
- 1...Sf4
- 2.Re1#
- 1...Bf7!
- threat
- 1.Qg8?
- 1...Qxb5
- 2.c4#
- 1...Bxa2
- 2.Qg4#
- 1...Se1
- 2.Rxe1#
- 1...Bc4
- 2.Qg4#
- 1...Qc4
- 2.c3#
- 1...Bb3
- 2.Qg4#
- 2.cxb3#
- 1...Bh3
- 2.cxd3#
- 2.c3#
- 1...Bg4
- 2.Qxg4#
- 2.cxd3#
- 2.c3#
- 1...Bd5
- 2.Qg4#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Bd7
- 2.cxd3#
- 2.c3#
- 1...Bf7
- 2.Qg4#
- 1...Bc8
- 2.cxd3#
- 2.c3#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...b3
- 2.cxb3#
- 1...c4
- 2.cxd3#
- 1...Bxg8!
- 1...Qxb5
- 1.Qh8?
- 1...Qxb5
- 2.c4#
- 1...Bxa2
- 2.Qh5#
- 1...Se1
- 2.Rxe1#
- 1...Bc4
- 2.Qh5#
- 1...Qc4
- 2.c3#
- 1...Bb3
- 2.Qh5#
- 2.cxb3#
- 1...Bh3
- 2.cxd3#
- 2.c3#
- 1...Bg4
- 2.cxd3#
- 2.c3#
- 1...Bd5
- 2.Qh5#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Bd7
- 2.cxd3#
- 2.c3#
- 1...Bc8
- 2.cxd3#
- 2.c3#
- 1...Bg8
- 2.Qh5#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...b3
- 2.cxb3#
- 1...c4
- 2.cxd3#
- 1...Bf7!
- 1...Qxb5
- 1.c4+?
- 1...Qc2
- 2.Raxc2#
- 1...Qd2!
- 1...Qc2
- 1.Qe8?
- Keys
- 1.Qc8!
- 1...Qxb5
- 2.c4#
- 1...Bxa2
- 2.Qg4#
- 1...Bxc8
- 2.cxd3#
- 2.c3#
- 1...Se1
- 2.Rxe1#
- 1...Bc4
- 2.Qg4#
- 1...Qc4
- 2.c3#
- 1...Bb3
- 2.Qg4#
- 2.cxb3#
- 1...Bh3
- 2.cxd3#
- 2.c3#
- 1...Bg4
- 2.Qxg4#
- 2.cxd3#
- 2.c3#
- 1...Bd5
- 2.Qg4#
- 1...Bf5
- 2.cxd3#
- 2.c3#
- 1...Bd7
- 2.cxd3#
- 2.c3#
- 1...Bf7
- 2.Qg4#
- 1...Bg8
- 2.Qg4#
- 1...Sf4
- 2.Re1#
- 1...Sh4
- 2.Re1#
- 1...b3
- 2.cxb3#
- 1...c4
- 2.cxd3#
- 1...Qxb5
- 1.Qc8!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 1
- Sets
- Q(d);S_CUTB(i)::R(D)+P(E)
- Q(d);N_GUARD,N_SPINQ(d),XB(G)::R(D)+P(E)
- B(i);OGATE::R(D)+P(E),XB(i)
- S(b);N_GUARD::R1(B),XS(b)
- S(b);N_GUARD::R1(B)
- P(f);OGATE::R(D)+P(E),XP(f)
- P(h);N_SPINQ(d),S_CUTB(i)::R(D)+P(E),XQ(d)
- Tries
- Try
- Q(I);
- Vars
- Q(d);N_GUARD,N_SPINQ(d),XB(G)::R(D)+P(E)
- B(i);N_GUARD,XR(D)::QAB(I)
- S(b);N_GUARD::R1(B),XS(b)
- B(i);N_GUARD,N_SPINQ(d)::QAB(I)
- Q(d);S_CUTB(i)::R(D)+P(E)
- B(i);N_GUARD::QAB(I)
- S(b);N_GUARD::R1(B)
- P(f);OGATE::R(D)+P(E),XP(f)
- P(h);N_SPINQ(d),S_CUTB(i)::R(D)+P(E),XQ(d)
- Refutation
- B(i);
- Try
- Q(I);
- Threat
- QAB1(I)
- Vars
- S(b);N_GUARD::R1(B),XS(b)
- S(b);N_GUARD::R1(B)
- Refutation
- B(i);
- Try
- Q(I);
- Vars
- Q(d);N_GUARD,N_SPINQ(d),XB(G)::R(D)+P(E)
- B(i);N_GUARD,XR(D)::QAB(I)
- S(b);N_GUARD::R1(B),XS(b)
- B(i);N_GUARD,N_SPINQ(d)::QAB(I)
- Q(d);S_CUTB(i)::R(D)+P(E)
- B(i);N_GUARD::QAB(I)
- S(b);N_GUARD::R1(B)
- P(f);OGATE::R(D)+P(E),XP(f)
- P(h);N_SPINQ(d),S_CUTB(i)::R(D)+P(E),XQ(d)
- Refutation
- B(i);XQ(I)
- Try
- Q(I);
- Vars
- Q(d);N_GUARD,N_SPINQ(d),XB(G)::R(D)+P(E)
- B(i);N_GUARD,XR(D)::QAB(I)
- S(b);N_GUARD::R1(B),XS(b)
- B(i);N_GUARD,N_SPINQ(d)::QAB(I)
- Q(d);S_CUTB(i)::R(D)+P(E)
- B(i);N_GUARD::QAB(I)
- S(b);N_GUARD::R1(B)
- P(f);OGATE::R(D)+P(E),XP(f)
- P(h);N_SPINQ(d),S_CUTB(i)::R(D)+P(E),XQ(d)
- Refutation
- B(i);
- Try
- P(E);CHECK,N_PINQ(d)
- Vars
- Q(d);N_GUARD,P_SPINQ(d)::R(D),XQ(d)
- Refutation
- Q(d);P_SPINQ(d)
- Try
- Actual
- Q(I);
- Vars
- Q(d);N_GUARD,N_SPINQ(d),XB(G)::R(D)+P(E)
- B(i);OGATE,XR(D)::QAB(I)
- S(b);N_GUARD::R1(B),XS(b)
- B(i);N_SPINQ(d),OGATE::QAB(I)
- Q(d);S_CUTB(i)::R(D)+P(E)
- B(i);OGATE::QAB(I)
- S(b);N_GUARD::R1(B)
- P(f);OGATE::R(D)+P(E),XP(f)
- P(h);N_SPINQ(d),S_CUTB(i)::R(D)+P(E),XQ(d)
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).