MESON Chess Problem Database
Problem Display
PID: 154129 (Q1N5/1q1PK3/1Bk5/p7/p6p/pbN4B/P5P1/1R6 w - - 0 1)
Harley, Brian
The Observer, 1955
(First published on Sun May 1 1955)
#2
10 + 7
| 15290 | Harley Scrapbook | 2015 |
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qxa8
- 2.d8S#
- 1...Bd1
- 2.Sa7#
- 1...Bxa2
- 2.Sa7#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...Qxa8
- Tries
- 1.Bg4?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...h3!
- 1...Qxa8
- 1.Bf5?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 2.Be4#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...h3!
- 1...Qxa8
- 1.Be6?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bxe6
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 2.Bd5#
- 1...Bc2
- 2.Sa7#
- 2.Bd5#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 2.Bxd5#
- 1...h3!
- 1...Qxa8
- 1.Rb2?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...axb2!
- 1...Qxa8
- 1.Rxb3?
- threat
- 2.Sa7#
- 1...Qxa8
- 2.d8S#
- 1...axb3!
- threat
- 1.Qa6?
- threat
- 2.Qb5#
- 1...Qxd7+
- 2.Bxd7#
- 1...Qxa6
- 2.d8S#
- 1...Qxc8
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxb6
- 2.Qxb6#
- 1...Qa8
- 2.Qxa8#
- 2.d8S#
- 1...Qa7
- 2.Sxa7#
- 1...Qb8
- 2.d8S#
- 1...Bc4
- 2.Qxc4#
- 1...Qc7!
- threat
- 1.g3?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...hxg3!
- 1...Qxa8
- 1.g4?
- 1...Qxa8
- 2.d8S#
- 1...Bxa2
- 2.Sa7#
- 1...Bd1
- 2.Sa7#
- 1...Bc2
- 2.Sa7#
- 1...Bc4
- 2.Sa7#
- 1...Bd5
- 2.Sa7#
- 1...Be6
- 2.Sa7#
- 1...Bf7
- 2.Sa7#
- 1...Bg8
- 2.Sa7#
- 1...hxg4 ep!
- 1...Qxa8
- 1.Bg4?
- Keys
- 1.Qb8!
- threat
- 2.Qd6#
- 1...Qxd7+
- 2.Bxd7#
- 1...Qxc8
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxb6
- 2.Qxb6#
- 1...Qxb8
- 2.d8S#
- 1...Qa6
- 2.Qc7#
- 2.d8S#
- 1...Qa8
- 2.Qc7#
- 2.Qxa8#
- 2.d8S#
- 1...Qa7
- 2.Sxa7#
- 1...Qc7
- 2.Qxc7#
- threat
- 1.Qb8!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 9
- Sets
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);::S(J)
- B(b);XP(B)::S(J)
- Tries
- Try
- B(E);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);::S(J)
- Refutation
- P(d);
- Try
- B(E);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);::S(J)
- Refutation
- P(d);
- Try
- B(E);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);XB(E)::S(J)
- B(b);::S(J)
- Refutation
- P(d);
- Try
- R(A);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);::S(J)
- Refutation
- P(a);XR(A)
- Try
- R(A);XB(b)
- Threat
- S(J)
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- Refutation
- P(c);XR(A)
- Try
- Q(I);N_PINQ(g)
- Threat
- QAB1(I)
- Vars
- Q(g);CHECK,OGATE,XP(G)::B(E),XQ(g)
- Q(g);N_PINP(G),XQ(I)::P=S
- Q(g);N_PINP(G),XS(J)::PXQ(g)=Q
- Q(g);N_PINP(G),OGATE,P_SPINQ(g),XB(F)::QAR1(I),XQ(g)
- Q(g);N_GUARD::S(J),XQ(g)
- Q(g);N_PINP(G)::P=S
- B(b);N_GUARD::QAR2(I),XB(b)
- Refutation
- Q(g);
- Try
- P(C);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);::S(J)
- Refutation
- P(d);XP(C)
- Try
- P(C);
- Vars
- Q(g);N_PINP(G),N_SPINQ(g),XQ(I)::P=S
- B(b);XP(B)::S(J)
- B(b);::S(J)
- Refutation
- P(d);EP,XP(C)
- Try
- Actual
- Q(I);N_PINQ(g)
- Threat
- QAR1(I)
- Vars
- Q(g);CHECK,OGATE,XP(G)::B(E),XQ(g)
- Q(g);N_PINP(G),XS(J)::PXQ(g)=Q
- Q(g);N_PINP(G),OGATE,XB(F)::QAR1(I),XQ(g)
- Q(g);N_PINP(G),XQ(I)::P=S
- Q(g);N_GUARD::S(J),XQ(g)
- Q(g);N_GUARD::QAR1(I),XQ(g)
Developed and maintained by Brian Stephenson.
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CSS/Javascript (jQuery, Bootstrap & DataTables).