MESON Chess Problem Database
Problem Display
PID: 163351 (7b/5P1n/1p4Rr/1bkB1P2/p2NQ3/3p4/N7/Kn4B1 w - - 0 1)
Ellerman, Arnoldo
The Observer, 1925
(First published on Sun May 10 1925)
#2
9 + 9
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Bxd4+
- 2.Bxd4#
- 2.Qxd4#
- 1...Sc3
- 2.Sb3#
- 1...Sg5
- 2.f8Q#
- 2.f8B#
- 1...Sf6
- 2.f8Q#
- 2.f8B#
- 1...Bxd4+
- Tries
- 1.Bb3?
- threat
- 2.Qd5#
- 2.Qe7#
- 1...Bxd4+
- 2.Bxd4#
- 2.Qxd4#
- 1...Rxg6
- 2.Qd5#
- 1...Bf6
- 2.Qd5#
- 1...Sf6
- 2.Qe7#
- 2.f8Q#
- 2.f8B#
- 1...Bc4
- 2.Qc6#
- 1...Bc6
- 2.Qxc6#
- 2.Qe7#
- 1...Be5
- 2.Qd5#
- 2.Qxe5#
- 1...Sc3
- 2.Qe7#
- 1...axb3!
- threat
- 1.Bc4?
- threat
- 2.Qd5#
- 1...Bxd4+
- 2.Qxd4#
- 1...Bxc4
- 2.Qc6#
- 1...Sf6
- 2.Sxb5#
- 1...Bc6
- 2.Qxc6#
- 1...Sc3
- 2.Sb3#
- 1...Kxc4!
- threat
- 1.Bb7?
- threat
- 2.Qd5#
- 1...Bxd4+
- 2.Qxd4#
- 1...Kc4
- 2.Qd5#
- 1...Bc4
- 2.Qc6#
- 2.Qe7#
- 1...Bc6
- 2.Qxc6#
- 1...Sc3
- 2.Sb3#
- 1...Sf6!
- threat
- 1.Ba8?
- threat
- 2.Qd5#
- 1...Bxd4+
- 2.Qxd4#
- 1...Kc4
- 2.Qd5#
- 1...Bc4
- 2.Qc6#
- 2.Qe7#
- 1...Bc6
- 2.Qxc6#
- 1...Sc3
- 2.Sb3#
- 1...Sf6!
- threat
- 1.Qe5?
- threat
- 2.Sc2#
- 2.Se2#
- 2.Sb3#
- 2.Sf3#
- 2.Sc6#
- 2.Se6#
- 2.Qd6#
- 1...Rxg6
- 2.Sb3#
- 2.Se6#
- 1...Rh1
- 2.Sb3#
- 2.Se6#
- 2.Qd6#
- 1...Rh2
- 2.Sb3#
- 2.Se6#
- 2.Qd6#
- 1...Rh3
- 2.Sb3#
- 2.Sf3#
- 2.Se6#
- 2.Qd6#
- 1...Rh4
- 2.Sb3#
- 2.Se6#
- 2.Qd6#
- 1...Bc4
- 2.Qd6#
- 1...Ba6
- 2.Qd6#
- 1...Bc6
- 2.Qd6#
- 1...Bd7
- 2.Qd6#
- 1...Be8
- 2.Qd6#
- 1...Bf6
- 2.Sc2#
- 2.Se2#
- 2.Sb3#
- 2.Sf3#
- 2.Sc6#
- 2.Se6#
- 1...Sf6
- 2.Sc2#
- 2.Se2#
- 2.Sb3#
- 2.Sf3#
- 2.Sc6#
- 2.Se6#
- 2.f8Q#
- 2.f8B#
- 1...Bxe5!
- threat
- 1.Bb3?
- Keys
- 1.Bc6!
- threat
- 2.Qd5#
- 1...Bxd4+
- 2.Qxd4#
- 1...Kc4
- 2.Qd5#
- 1...Bxc6
- 2.Qxc6#
- 1...Sf6
- 2.Sxb5#
- 1...Bc4
- 2.Qe7#
- 1...Sc3
- 2.Sb3#
- threat
- 1.Bc6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 0
- Sets
- S(a);N_PINS(D)::B(B)+S(D),DCHECK
- S(h);N_GUARD::P=Q
- S(h);N_GUARD,N_PINS(D)::P=Q
- Tries
- Try
- B(F);
- Threat
- DUALS(2)
- Vars
- R(g);XR(H)::QAR1(E)
- B(i);::QAR1(E)
- B(d);N_GUARD::QAR1(E)
- S(a);N_PINS(D)::QAB(E)
- Refutation
- P(c);XB(F)
- Try
- B(F);
- Threat
- QAR1(E)
- Vars
- B(i);CHECK,OGATE,P_SPINB(i),XS(D)::QAB1(E),XB(i)
- B(d);N_GUARD,SBLOCK,XB(F)::QAR1(E)
- S(h);N_PINS(D)::B(B)+S(D),XB(d)
- B(d);N_GUARD::QAR1(E),XB(d)
- S(a);N_PINS(D)::B(B)+S(D),DCHECK
- Refutation
- K(e);P-FLIGHT,XB(F)
- Try
- B(F);
- Threat
- QAR1(E)
- Vars
- B(i);CHECK,OGATE,P_SPINB(i),XS(D)::QAB1(E),XB(i)
- K(e);P-FLIGHT::QAB1(E)
- B(d);N_GUARD::QAR1(E),XB(d)
- S(a);N_PINS(D)::B(B)+S(D),DCHECK
- Refutation
- S(h);N_PINS(D)
- Try
- B(F);
- Threat
- QAR1(E)
- Vars
- B(i);CHECK,OGATE,P_SPINB(i),XS(D)::QAB1(E),XB(i)
- K(e);P-FLIGHT::QAB1(E)
- B(d);N_GUARD::QAR1(E),XB(d)
- S(a);N_PINS(D)::B(B)+S(D),DCHECK
- Refutation
- S(h);N_PINS(D)
- Try
- Q(E);N_SPINS(D)
- Threat
- DUALS(7)
- Vars
- B(d);::QAB1(E)
- Refutation
- B(i);P_PINS(D),XQ(E)
- Try
- Actual
- B(F);
- Threat
- QAR1(E)
- Vars
- B(i);CHECK,OGATE,P_SPINB(i),XS(D)::QAB1(E),XB(i)
- K(e);P-FLIGHT::QAB1(E)
- B(d);OGATE,XB(F)::QAR1(E),XB(d)
- S(h);N_PINS(D)::B(B)+S(D),XB(d)
- B(d);SBLOCK::QAB(E)
- S(a);N_PINS(D)::B(B)+S(D),DCHECK
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