MESON Chess Problem Database
Problem Display
PID: 192642 (8/2BKN2p/2pp2p1/p1qpk3/R2p4/5Q2/4n3/2n1R3 w - - 0 1)
Allen, Frederick B
The Observer, 1939
(First published on Sun Mar 5 1939)
#2
6 + 11
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qa3
- 2.Sxc6#
- 1...Qb4
- 2.Sxc6#
- 1...Qb6
- 2.Bxd6#
- 1...Qa7
- 2.Sxc6#
- 1...Qc2
- 2.Bxd6#
- 1...Qc3
- 2.Bxd6#
- 1...Qc4
- 2.Bxd6#
- 1...Qb5
- 2.Bxd6#
- 1...Sa2
- 2.Rxe2#
- 1...Sb3
- 2.Rxe2#
- 1...Sd3
- 2.Rxe2#
- 1...d3
- 2.Qf4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Sxg6#
- 1...h6
- 2.Sxg6#
- 1...Qa3
- Tries
- 1.Bb8?
- 1...Qa3
- 2.Sxc6#
- 1...Qb4
- 2.Sxc6#
- 1...Qb6
- 2.Bxd6#
- 1...Qc2
- 2.Bxd6#
- 1...Qc3
- 2.Bxd6#
- 1...Qc4
- 2.Bxd6#
- 1...Qb5
- 2.Bxd6#
- 1...Sa2
- 2.Rxe2#
- 1...Sb3
- 2.Rxe2#
- 1...Sd3
- 2.Rxe2#
- 1...d3
- 2.Qf4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Sxg6#
- 1...h6
- 2.Sxg6#
- 1...Qa7+!
- 1...Qa3
- 1.Rxa5?
- 1...Qxa5
- 2.Sxc6#
- 2.Bxd6#
- 1...Qa3
- 2.Sxc6#
- 1...Qb4
- 2.Sxc6#
- 1...Qb6
- 2.Bxd6#
- 1...Qa7
- 2.Sxc6#
- 1...Qc2
- 2.Bxd6#
- 1...Qc3
- 2.Bxd6#
- 1...Qc4
- 2.Bxd6#
- 1...Qb5
- 2.Bxd6#
- 1...Sa2
- 2.Rxe2#
- 1...Sb3
- 2.Rxe2#
- 1...Sd3
- 2.Rxe2#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Sxg6#
- 1...h6
- 2.Sxg6#
- 1...d3!
- 1...Qxa5
- 1.Bb8?
- Keys
- 1.Rf1!
- 1...Sf4
- 2.Qxf4#
- 1...Qa3
- 2.Sxc6#
- 1...Qb4
- 2.Sxc6#
- 1...Qb6
- 2.Bxd6#
- 1...Qa7
- 2.Sxc6#
- 1...Qc2
- 2.Bxd6#
- 1...Qc3
- 2.Bxd6#
- 1...Qc4
- 2.Bxd6#
- 1...Qb5
- 2.Bxd6#
- 1...Sa2
- 2.Qxe2#
- 1...Sb3
- 2.Qxe2#
- 1...Sd3
- 2.Qxe2#
- 1...Sg1
- 2.Qf4#
- 1...Sc3
- 2.Qf4#
- 1...Sg3
- 2.Qf4#
- 1...d3
- 2.Qf6#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Sxg6#
- 1...h6
- 2.Sxg6#
- 1...Sf4
- 1.Rf1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- Q(e);N_GUARD::S(F),XP(h)
- Q(e);N_GUARD::B(D),XP(i)
- Q(e);N_GUARD,P_PINB(D)::S(F),XP(h)
- S(a);N_GUARD::R(A),XS(b)
- P(c);::QAB1(B)
- P(j);N_GUARD::QAR1(B)
- P(k);N_GUARD::S(F),XP(j)
- Tries
- Try
- B(D);
- Vars
- Q(e);N_GUARD::S(F),XP(h)
- Q(e);N_GUARD::B(D),XP(i)
- S(a);N_GUARD::R(A),XS(b)
- P(c);::QAB1(B)
- P(j);N_GUARD::QAR1(B)
- P(k);N_GUARD::S(F),XP(j)
- Refutation
- Q(e);CHECK
- Try
- R(C);XP(d)
- Vars
- Q(e);N_GUARD,N_SPINP(i),P_SPINP(f)::S(F),XP(h)
- Q(e);N_GUARD,N_SPINP(i),P_SPINP(f)::B(D),XP(i)
- Q(e);N_GUARD,N_SPINP(i),P_PINB(D),P_SPINP(f)::S(F),XP(h)
- Q(e);N_GUARD::B(D),XP(i)
- S(a);N_GUARD::R(A),XS(b)
- P(j);N_GUARD::QAR1(B)
- P(k);N_GUARD::S(F),XP(j)
- Refutation
- P(c);
- Try
- Actual
- R(A);N_PINS(b)
- Vars
- S(b);N_GUARD::QAB1(B),XS(b)
- Q(e);N_GUARD::S(F),XP(h)
- Q(e);N_GUARD::B(D),XP(i)
- Q(e);N_GUARD,P_PINB(D)::S(F),XP(h)
- S(a);N_GUARD::QAR(B),XS(b)
- S(b);N_GUARD::QAB1(B)
- P(c);::QAB1(B)
- P(j);N_GUARD::QAR1(B)
- P(k);N_GUARD::S(F),XP(j)
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