MESON Chess Problem Database
Problem Display
PID: 161787 (n1Q5/1B6/r1pk4/b3R3/8/3N4/1p6/1K6 w - - 0 1)
Fermo, ID
The Observer, 1923
(First published on Sun Sep 2 1923)
#2
5 + 6
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...Sb6
- 2.Qxc6#
- 1...Sc7
- 2.Qd8#
- 1...c5
- 2.Re6#
- 1...Rb6
- Tries
- 1.Bxc6?
- threat
- 2.Re6#
- 2.Qd7#
- 1...Sc7
- 2.Qd7#
- 1...Ra7
- 2.Re6#
- 1...Sb6
- 2.Re6#
- 1...Rxc6!
- threat
- 1.Bxa8?
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...c5
- 2.Re6#
- 1...Rxa8!
- 1...Rb6
- 1.Re2?
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...Sb6
- 2.Qxc6#
- 1...Sc7
- 2.Qd8#
- 1...c5
- 2.Re6#
- 1...Kd5!
- 1...Rb6
- 1.Re3?
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...Sb6
- 2.Qxc6#
- 1...Sc7
- 2.Qd8#
- 1...c5
- 2.Re6#
- 1...Kd5!
- 1...Rb6
- 1.Re8?
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...Sb6
- 2.Qxc6#
- 1...Sc7
- 2.Qd8#
- 1...c5
- 2.Re6#
- 1...Kd5!
- 1...Rb6
- 1.Qb8+?
- 1...Kd7
- 2.Sc5#
- 1...Sc7
- 2.Qd8#
- 1...Bc7!
- 1...Kd7
- 1.Qe8?
- threat
- 2.Qe7#
- 1...Bd8
- 2.Qxd8#
- 1...Kc7!
- threat
- 1.Qf8+?
- 1...Kd7
- 2.Qe7#
- 1...Kc7!
- 1...Kd7
- 1.Bxc6?
- Keys
- 1.Re4!
- 1...Kd5
- 2.Qe6#
- 1...Rb6
- 2.Qd8#
- 1...Ra7
- 2.Qxc6#
- 1...Be1
- 2.Qd8#
- 1...Bd2
- 2.Qd8#
- 1...Bc3
- 2.Qd8#
- 1...Bb4
- 2.Qd8#
- 1...Bb6
- 2.Qxc6#
- 1...Bc7
- 2.Qe6#
- 1...Bd8
- 2.Qxd8#
- 1...Sb6
- 2.Qxc6#
- 1...Sc7
- 2.Qd8#
- 1...c5
- 2.Re6#
- 1...Kd5
- 1.Re4!
FEATURES
- Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- S(f);S_CUTR(c)::QAR1(E),XP(d)
- S(f);S_CUTB(b)::QAR2(E)
- P(d);::R1(C)
- Tries
- Try
- B(D);XP(d)
- Threat
- DUALS(2)
- Vars
- S(f);::QAR1(E)
- R(c);::R1(C)
- S(f);::R1(C)
- Refutation
- R(c);XB(D)
- Try
- B(D);XS(f)
- Vars
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- P(d);::R1(C)
- Refutation
- R(c);XB(D)
- Try
- R(C);
- Vars
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- S(f);S_CUTR(c)::QAR1(E),XP(d)
- S(f);S_CUTB(b)::QAR2(E)
- P(d);::R1(C)
- Refutation
- K(e);P-FLIGHT,P_SPINP(d)
- Try
- R(C);
- Vars
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- S(f);S_CUTR(c)::QAR1(E),XP(d)
- S(f);S_CUTB(b)::QAR2(E)
- P(d);::R1(C)
- Refutation
- K(e);P-FLIGHT,P_SPINP(d)
- Try
- R(C);
- Vars
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- S(f);S_CUTR(c)::QAR1(E),XP(d)
- S(f);S_CUTB(b)::QAR2(E)
- P(d);::R1(C)
- Refutation
- K(e);P-FLIGHT,P_SPINP(d)
- Try
- Q(E);CHECK
- Vars
- K(e);P-FLIGHT::S(B)
- S(f);P_SPINS(f),S_CUTB(b)::QAR2(E)
- Refutation
- B(b);P_SPINB(b)
- Try
- Q(E);
- Threat
- QAB1(E)
- Vars
- B(b);N_GUARD::QAR2(E),XB(b)
- Refutation
- K(e);S_FLIGHT
- Try
- Q(E);CHECK
- Vars
- K(e);P-FLIGHT::QAR1(E)
- Refutation
- K(e);S_FLIGHT
- Try
- Actual
- R(C);
- Vars
- K(e);P-FLIGHT,P_SPINP(d)::QAB1(E)
- R(c);S_CUTB(b)::QAR2(E)
- R(c);N_GUARD::QAR1(E),XP(d)
- B(b);N_GUARD::QAR2(E)
- B(b);S_CUTR(c)::QAR1(E),XP(d)
- B(b);SBLOCK::QAR1(E)
- B(b);N_GUARD::QAR2(E),XB(b)
- S(f);S_CUTR(c)::QAR1(E),XP(d)
- S(f);S_CUTB(b)::QAR2(E)
- P(d);::R1(C)
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