MESON Chess Problem Database
Problem Display
PID: 190952 (5r2/3B2p1/1p1B1bRn/3k4/2N5/1K1PP1N1/Q7/4n3 w - - 0 1)
Allen, Frederick B
The Observer, 1938
(First published on Sun Oct 16 1938)
#2
9 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rf7
- 2.Qa8#
- 1...Ra8
- 2.Qxa8#
- 1...Ba1
- 2.Sxb6#
- 1...Bb2
- 2.Sxb6#
- 1...Bc3
- 2.Sxb6#
- 1...Bd4
- 2.e4#
- 1...Bh4
- 2.Sxb6#
- 1...Be5
- 2.Sxb6#
- 1...Bg5
- 2.Sxb6#
- 1...Be7
- 2.Sxb6#
- 1...Bd8
- 2.Qa8#
- 1...Sg2
- 2.Qxg2#
- 1...Sxd3
- 2.Qg2#
- 1...Rf7
- Tries
- 1.Se2?
- threat
- 2.Sf4#
- 2.e4#
- 1...Re8
- 2.Sf4#
- 1...Ba1
- 2.Sxb6#
- 2.e4#
- 1...Bb2
- 2.Sxb6#
- 2.e4#
- 1...Bc3
- 2.Sxc3#
- 2.Sxb6#
- 2.e4#
- 1...Bd4
- 2.e4#
- 1...Bh4
- 2.Sc3#
- 2.Sxb6#
- 2.e4#
- 1...Be5
- 2.Sxb6#
- 2.e4#
- 1...Bg5
- 2.Sc3#
- 2.Sxb6#
- 2.e4#
- 1...Be7
- 2.Sc3#
- 2.Sxb6#
- 2.e4#
- 1...Bd8
- 2.Sc3#
- 2.Qa8#
- 2.e4#
- 1...Sg2
- 2.e4#
- 1...Sxd3!
- threat
- 1.Sf5?
- threat
- 2.Sxb6#
- 2.e4#
- 1...Sxd3
- 2.Qg2#
- 1...Rb8
- 2.e4#
- 1...Re8
- 2.Sxb6#
- 1...Bd4
- 2.Se7#
- 2.e4#
- 1...Bd8
- 2.Qa8#
- 2.e4#
- 1...b5
- 2.Sb6#
- 2.e4#
- 1...Sxf5!
- threat
- 1.Qa1?
- threat
- 2.e4#
- 1...Bxa1
- 2.Sxb6#
- 1...Bb2
- 2.Sxb6#
- 1...Bc3
- 2.Sxb6#
- 1...Re8!
- threat
- 1.Qb2?
- threat
- 2.e4#
- 1...Bxb2
- 2.Sxb6#
- 1...Bc3
- 2.Sxb6#
- 1...Re8!
- threat
- 1.Qg2+?
- 1...Sf3
- 2.Qxf3#
- 1...Sxg2!
- 1...Sf3
- 1.Qa3?
- threat
- 2.Sxb6#
- 1...Bd4
- 2.e4#
- 1...Bd8
- 2.Qa8#
- 1...b5
- 2.Sb6#
- 2.Qc5#
- 1...Rb8!
- threat
- 1.Qa4?
- threat
- 2.Qb5#
- 2.Qc6#
- 1...Sxd3
- 2.Qc6#
- 1...Bd4
- 2.Bc6#
- 2.Be6#
- 2.Qc6#
- 2.e4#
- 1...b5
- 2.Qxb5#
- 1...Rc8!
- threat
- 1.Qa5+?
- 1...b5
- 2.Qxb5#
- 1...bxa5!
- 1...b5
- 1.Qa6?
- threat
- 2.Qb5#
- 2.Qb7#
- 1...Sxd3
- 2.Qb7#
- 1...Rb8
- 2.Qb5#
- 1...Bd4
- 2.Qb7#
- 2.e4#
- 1...b5
- 2.Qxb5#
- 2.Qb7#
- 2.Qc6#
- 1...Rc8!
- threat
- 1.Se2?
- Keys
- 1.Sh5!
- threat
- 2.Sf4#
- 1...Sxd3
- 2.Qg2#
- 1...Ba1
- 2.Sxb6#
- 1...Bb2
- 2.Sxb6#
- 1...Bc3
- 2.Sxb6#
- 1...Bd4
- 2.e4#
- 1...Bh4
- 2.Sxb6#
- 1...Be5
- 2.Sxb6#
- 1...Bg5
- 2.Sxb6#
- 1...Be7
- 2.Sxb6#
- 1...Bd8
- 2.Qa8#
- 1...Sg2
- 2.Qxg2#
- threat
- 1.Sh5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 2
- Sets
- R(g);N_GUARD::QAB(A)
- R(g);N_GUARD::QAB(A),XR(g)
- B(d);::S(F),XP(c)
- B(d);SBLOCK::P(D)
- B(d);S_CUTR(g)::QAB(A)
- S(a);N_GUARD::QAB(A),XS(a)
- S(a);N_GUARD,XP(C)::QAB(A)
- Tries
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- R(g);::S(E)
- B(d);::P(D)
- S(a);::P(D)
- Refutation
- S(a);XP(C)
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- S(a);N_GUARD,XP(C)::QAB(A)
- R(g);::P(D)
- R(g);::S(F),XP(c)
- Refutation
- S(e);XS(E)
- Try
- Q(A);
- Threat
- P(D)
- Vars
- B(d);XQ(A)::S(F),XP(c)
- B(d);::S(F),XP(c)
- Refutation
- R(g);
- Try
- Q(A);
- Threat
- P(D)
- Vars
- B(d);XQ(A)::S(F),XP(c)
- B(d);::S(F),XP(c)
- Refutation
- R(g);
- Try
- Q(A);CHECK
- Vars
- S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
- Refutation
- S(a);XQ(A)
- Try
- Q(A);
- Threat
- S(F),XP(c)
- Vars
- B(d);SBLOCK::P(D)
- B(d);S_CUTR(g)::QAB(A)
- Refutation
- R(g);
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- S(a);XP(C)::QAB1(A)
- P(c);::QAR2(A),XP(c)
- Refutation
- R(g);
- Try
- Q(A);CHECK
- Vars
- P(c);P_SPINP(c)::QAR2(A),XP(c)
- Refutation
- P(c);XQ(A)
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- S(a);XP(C)::QAB(A)
- R(g);::QAR2(A)
- Refutation
- R(g);
- Try
- Actual
- S(E);
- Threat
- S(E)
- Vars
- S(a);N_GUARD,XP(C)::QAB(A)
- B(d);::S(F),XP(c)
- B(d);SBLOCK::P(D)
- B(d);S_CUTR(g)::QAB(A)
- S(a);N_GUARD::QAB(A),XS(a)
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