MESON Chess Problem Database
Problem Display
PID: 195945 (8/3N4/Q7/Pr1n4/RPkp4/RN1n4/3P4/K7 w - - 0 1)
Fenner, A Jack
The Observer, 1943
(First published on Sun Jan 31 1943)
#2
9 + 5
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Sc1
- 2.Se5#
- 1...Se1
- 2.Se5#
- 1...Sb2
- 2.Se5#
- 1...Sf2
- 2.Se5#
- 1...S3xb4
- 2.Se5#
- 1...S3f4
- 2.Se5#
- 1...Sc5
- 2.Se5#
- 1...Se5
- 2.Sxe5#
- 1...Sc3
- 2.Sb6#
- 1...Se3
- 2.Sb6#
- 1...S5xb4
- 2.Sb6#
- 1...S5f4
- 2.Sb6#
- 1...Sb6
- 2.Sxb6#
- 1...Sf6
- 2.Sb6#
- 1...Sc7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Sc1
- Tries
- 1.Kb1?
- 1...S3xb4
- 2.Se5#
- 1...S5xb4
- 2.Sb6#
- 1...Sc1
- 2.Se5#
- 1...Se1
- 2.Se5#
- 1...Sb2
- 2.Se5#
- 1...Sf2
- 2.Se5#
- 1...S3f4
- 2.Se5#
- 1...Sc5
- 2.Se5#
- 1...Se5
- 2.Sxe5#
- 1...Se3
- 2.Sb6#
- 1...S5f4
- 2.Sb6#
- 1...Sb6
- 2.Sxb6#
- 1...Sf6
- 2.Sb6#
- 1...Sc7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Sc3+!
- 1...S3xb4
- 1.Sc1?
- 1...Sxc1
- 2.Se5#
- 1...S3xb4
- 2.d3#
- 1...Sc3
- 2.Sb6#
- 1...Se3
- 2.Sb6#
- 1...S5f4
- 2.Sb6#
- 1...Sb6
- 2.Sxb6#
- 1...Sf6
- 2.Sb6#
- 1...Sc7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Se1
- 2.Se5#
- 1...Sb2
- 2.Se5#
- 1...Sf2
- 2.Se5#
- 1...S3f4
- 2.Se5#
- 1...Sc5
- 2.Se5#
- 1...Se5
- 2.Sxe5#
- 1...S5xb4!
- 1...Sxc1
- 1.Qc6+?
- 1...Sc5
- 2.Se5#
- 1...Rc5!
- 1...Sc5
- 1.Kb1?
- Keys
- 1.Sbc5!
- 1...S3xb4
- 2.d3#
- 1...Sxc5
- 2.Se5#
- 1...S5xb4
- 2.Qe6#
- 1...Sc3
- 2.Sb6#
- 1...Se3
- 2.Sb6#
- 1...S5f4
- 2.Sb6#
- 1...Sb6
- 2.Sxb6#
- 1...Sf6
- 2.Sb6#
- 1...Sc7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Sc1
- 2.Se5#
- 1...Se1
- 2.Se5#
- 1...Sb2
- 2.Se5#
- 1...Sf2
- 2.Se5#
- 1...S3f4
- 2.Se5#
- 1...Se5
- 2.Sxe5#
- 1...S3xb4
- 1.Sbc5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::S(I)
- S(a);N_GUARD,P_SPINS(a),XP(F)::S(I)
- S(a);N_GUARD::S(I),XS(a)
- S(e);N_GUARD::S(I)
- S(e);N_GUARD,P_SPINS(e),XP(F)::S(I)
- S(e);N_GUARD::S(I),XS(e)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- S(a);N_GUARD,P_SPINS(a),XP(F)::S(I)
- S(e);N_GUARD,P_SPINS(e),XP(F)::S(I)
- S(a);N_GUARD::S(I)
- S(a);N_GUARD::S(I),XS(a)
- S(e);N_GUARD::S(I)
- S(e);N_GUARD::S(I),XS(e)
- Refutation
- S(e);CHECK
- Try
- S(D);
- Vars
- S(a);N_GUARD,XS(D)::S(I)
- S(a);OGATE,P_SPINS(a),XP(F)::P(B)
- S(e);N_GUARD::S(I)
- S(e);N_GUARD::S(I),XS(e)
- S(a);N_GUARD::S(I)
- S(a);N_GUARD::S(I),XS(a)
- Refutation
- S(e);P_SPINS(e),XP(F)
- Try
- Q(H);CHECK,N_PINR(d)
- Vars
- S(a);P_SPINS(a)::S(I)
- Refutation
- R(d);P_SPINR(d)
- Try
- Actual
- S(D);
- Vars
- S(a);OGATE,P_SPINS(a),XP(F)::P(B)
- S(a);N_GUARD,XS(D)::S(I)
- S(e);OGATEB,P_SPINS(e),XP(F)::QAB(H)
- S(e);N_GUARD::S(I)
- S(e);N_GUARD::S(I),XS(e)
- S(a);N_GUARD::S(I)
- S(a);N_GUARD::S(I),XS(a)
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