MESON Chess Problem Database
Problem Display
PID: 190855 (2R5/q1nNK2b/1B1P1R2/1p1kN3/3prP2/8/6Q1/8 w - - 0 1)
Allen, Frederick B
The Observer, 1938
(First published on Sun May 29 1938)
#2
9 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qxb6
- 2.Qa2#
- 1...Qb8
- 2.Qa2#
- 1...Qa2
- 2.Qxa2#
- 1...Qb7
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Qxb6
- Tries
- 1.Re6?
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Sxe6!
- threat
- 1.Rg6?
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Se6!
- threat
- 1.Rh6?
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Se6!
- threat
- 1.Rf7?
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Se6!
- threat
- 1.Rff8?
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- 1...Se6!
- threat
- 1.Qc2?
- threat
- 2.Qb3#
- 2.Qc5#
- 2.Qc6#
- 1...Qxb6
- 2.Sxb6#
- 2.Qb3#
- 2.Qa2#
- 1...Rxf4
- 2.Qc6#
- 1...Qa2
- 2.Qxa2#
- 2.Qc5#
- 2.Qc6#
- 1...Qa3
- 2.Qc6#
- 1...Qa4
- 2.Qc5#
- 2.Qc6#
- 1...Qb7
- 2.Qb3#
- 2.Qa2#
- 2.Qc5#
- 1...Qa8
- 2.Qb3#
- 2.Qc5#
- 1...Re1
- 2.Qc6#
- 1...Re2
- 2.Qc6#
- 1...Re3
- 2.Qc6#
- 1...Sa6
- 2.Qb3#
- 2.Qa2#
- 2.Qc6#
- 1...Se6
- 2.Qb3#
- 2.Qc6#
- 1...d3
- 2.Qc5#
- 2.Qc6#
- 1...Rxe5+!
- threat
- 1.Qg8+?
- 1...Se6
- 2.Rc5#
- 2.Qxe6#
- 1...Bxg8!
- 1...Se6
- 1.Re6?
- Keys
- 1.Rf5!
- threat
- 2.Sf6#
- 1...Qxb6
- 2.Qa2#
- 1...Sa6
- 2.Qa2#
- 1...Se6
- 2.Sg6#
- 1...Sa8
- 2.Rc5#
- 1...Se8
- 2.Rc5#
- threat
- 1.Rf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 3
- Sets
- Q(e);N_GUARD,XB(D)::QAB(A)
- Q(e);N_GUARD::QAB(A)
- Q(e);N_GUARD::QAB(A),XQ(e)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);OGATE::R1(I)
- Tries
- Try
- R(F);N_SPINS(C)
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);P_PINS(G),S_CUTQ(e)::QAB(A)
- S(f);OGATE,P_PINS(G)::R1(I)
- Refutation
- S(f);P_PINS(G),XR(F)
- Try
- R(F);
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);OGATE::R1(I)
- Refutation
- S(f);N_PINS(C),P_PINS(G)
- Try
- R(F);
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);OGATE::R1(I)
- Refutation
- S(f);N_PINS(C),P_PINS(G)
- Try
- R(F);
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);OGATE::R1(I)
- Refutation
- S(f);N_PINS(C),P_PINS(G)
- Try
- R(F);
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);OGATE::R1(I)
- Refutation
- S(f);N_PINS(C),P_PINS(G)
- Try
- Q(A);N_PINR(b)
- Threat
- DUALS(3)
- Vars
- R(b);N_PINS(C),XP(B)::QAB1(A)
- Q(e);P_PINP(E)::QAB1(A)
- R(b);::QAB1(A)
- Refutation
- R(b);CHECK,XS(C)
- Try
- Q(A);CHECK,N_PINR(b)
- Refutation
- B(g);XQ(A)
- Try
- Actual
- R(F);
- Threat
- S(G)
- Vars
- Q(e);N_GUARD,XB(D)::QAB(A)
- S(f);S_CUTQ(e)::QAB(A)
- S(f);N_PINS(C),P_PINS(G)::R(F)+S(C)
- S(f);OGATE::R1(I)
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