MESON Chess Problem Database
Problem Display
PID: 199419 (5n2/4n1p1/1N3pR1/1N2k2K/1PQ5/2P3p1/6rp/5R1B w - - 0 1)
Watts, William
The Observer, 1945
(First published on Sun Apr 15 1945)
#2
9 + 8
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rg1
- 2.Qe2#
- 2.Qe4#
- 1...Ra2
- 2.Qe4#
- 1...Rb2
- 2.Qe4#
- 1...Rc2
- 2.Qe4#
- 1...Rd2
- 2.Qe4#
- 1...Re2
- 2.Qxe2#
- 1...Rf2
- 2.Qe4#
- 1...Sd5
- 2.Qxd5#
- 1...Sf5
- 2.Qd5#
- 1...Sc6
- 2.Qd5#
- 1...Sexg6
- 2.Qd5#
- 1...Sc8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Se6
- 2.Sd7#
- 1...Sfxg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...f5
- 2.Qd4#
- 2.Qf4#
- 1...Rg1
- Tries
- 1.Kg4?
- 1...Sexg6
- 2.Rf5#
- 2.Qd5#
- 1...Sfxg6
- 2.Sd7#
- 1...Sd5
- 2.Qxd5#
- 1...Rg1
- 2.Qe2#
- 2.Qe4#
- 1...Ra2
- 2.Qe4#
- 1...Rb2
- 2.Qe4#
- 1...Rc2
- 2.Qe4#
- 1...Rd2
- 2.Qe4#
- 1...Re2
- 2.Qxe2#
- 1...Rf2
- 2.Qe4#
- 1...Sf5
- 2.Rxf5#
- 2.Qd5#
- 1...Sc6
- 2.Rf5#
- 2.Qd5#
- 1...Sc8
- 2.Rf5#
- 2.Qd5#
- 1...Sg8
- 2.Rf5#
- 2.Qd5#
- 1...Se6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...f5+!
- 1...Sexg6
- 1.Sc7?
- threat
- 2.Qd4#
- 2.Qf4#
- 1...Kd6
- 2.Qc5#
- 1...Sexg6
- 2.Qd5#
- 2.Qd4#
- 1...Sfxg6
- 2.Qe6#
- 2.Qd4#
- 1...Rd2
- 2.Qf4#
- 1...Sd5
- 2.Qxd5#
- 1...Sf5
- 2.Qd5#
- 2.Qf4#
- 1...Sc6
- 2.Qd5#
- 2.Qf4#
- 1...Se6
- 2.Qxe6#
- 1...Rf2!
- threat
- 1.Re1+?
- 1...Kf5
- 2.Sd6#
- 2.Qe4#
- 2.Qg4#
- 1...Re2!
- 1...Kf5
- 1.Rf2?
- threat
- 2.Qe2#
- 1...Rxf2
- 2.Qe4#
- 1...Sd5
- 2.Qxd5#
- 1...Sf5
- 2.Qd5#
- 1...gxf2!
- threat
- 1.Rf4?
- threat
- 2.Qe4#
- 1...f5
- 2.Qd4#
- 2.Qc7#
- 1...Re2!
- threat
- 1.Rxg7?
- 1...Rf2
- 2.Qe4#
- 1...Sd5
- 2.Qxd5#
- 1...Re2
- 2.Qxe2#
- 1...Rg1
- 2.Qe2#
- 2.Qe4#
- 1...Ra2
- 2.Qe4#
- 1...Rb2
- 2.Qe4#
- 1...Rc2
- 2.Qe4#
- 1...Rd2
- 2.Qe4#
- 1...Sf5
- 2.Qd5#
- 1...Sc6
- 2.Qd5#
- 1...Seg6
- 2.Qd5#
- 1...Sc8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Se6
- 2.Sd7#
- 1...Sfg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 2.Rxe7#
- 1...Sh7
- 2.Sd7#
- 2.Rxe7#
- 1...f5!
- 1...Rf2
- 1.Qd3?
- threat
- 2.Qe3#
- 1...Rf2
- 2.Qe4#
- 1...Re2
- 2.Qxe2#
- 2.Qd6#
- 1...Sd5
- 2.Qf5#
- 2.Qxd5#
- 1...Sf5
- 2.Qxf5#
- 2.Qd5#
- 1...Ke6!
- threat
- 1.Qc5+?
- 1...Ke4
- 2.Qd4#
- 1...Sd5
- 2.Qxd5#
- 1...Ke6!
- 1...Ke4
- 1.Qc6?
- threat
- 2.Sc4#
- 1...Rf2
- 2.Qe4#
- 1...Sd5
- 2.Qxd5#
- 1...Sxc6!
- threat
- 1.Kg4?
- Keys
- 1.Sd4!
- 1...Ke4
- 2.Qe2#
- 1...Kd6
- 2.Qc5#
- 1...Sexg6
- 2.Qd5#
- 1...Sfxg6
- 2.Qe6#
- 1...Rg1
- 2.Qc7#
- 1...Ra2
- 2.Qc7#
- 1...Rb2
- 2.Qc7#
- 1...Rc2
- 2.Qc7#
- 1...Rd2
- 2.Qc7#
- 1...Re2
- 2.Qc7#
- 1...Rf2
- 2.Qc7#
- 1...Sd5
- 2.Qxd5#
- 1...Sf5
- 2.Qd5#
- 1...Sc6
- 2.Qd5#
- 1...Sc8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Se6
- 2.Qxe6#
- 1...Sd7
- 2.Qe6#
- 1...Sh7
- 2.Qe6#
- 1...f5
- 2.Sf3#
- 1...Ke4
- 1.Sd4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- R(a);::QAR1(E)
- R(a);N_GUARD::QAR(E),XR(a)
- S(f);N_GUARD::QAR1(E),XS(f)
- S(f);N_GUARD::QAR1(E)
- S(f);N_GUARD,XR(I)::QAR1(E)
- S(h);N_GUARD::S(H)
- S(h);N_GUARD,XR(I)::S(H)
- S(h);N_GUARD::S(H),XS(h)
- Tries
- Try
- K(G);S_FLIGHT
- Vars
- S(h);N_GUARD,XR(I)::S(H)
- S(f);N_GUARD::QAR1(E),XS(f)
- R(a);::QAR1(E)
- R(a);N_GUARD::QAR(E),XR(a)
- S(h);N_GUARD::S(H)
- S(h);N_GUARD::S(H),XS(h)
- Refutation
- P(e);CHECK
- Try
- S(F);
- Threat
- DUALS(2)
- Vars
- K(d);P_SPINP(e),S_FLIGHT::QAB1(E)
- R(a);::QAB1(E)
- S(f);N_GUARD::QAR1(E),XS(f)
- S(h);N_GUARD::QAR1(E),XS(h)
- Refutation
- R(a);
- Try
- R(A);CHECK
- Refutation
- R(a);P_SPINR(a)
- Try
- R(A);
- Threat
- QAR(E)
- Vars
- R(a);XR(A)::QAR1(E)
- S(f);N_GUARD::QAR1(E),XS(f)
- S(f);N_GUARD::QAR1(E)
- Refutation
- P(c);XR(A)
- Try
- R(A);
- Threat
- QAR1(E)
- Refutation
- R(a);
- Try
- R(I);XP(g)
- Vars
- R(a);::QAR1(E)
- S(f);N_GUARD::QAR1(E),XS(f)
- R(a);N_GUARD::QAR(E),XR(a)
- S(f);N_GUARD::QAR1(E)
- S(h);N_GUARD::S(H)
- Refutation
- P(e);
- Try
- Q(E);
- Threat
- QAR2(E)
- Vars
- R(a);::QAR1(E)
- Refutation
- K(d);P-FLIGHT,P_SPINP(e)
- Try
- Q(E);CHECK
- Vars
- K(d);P-FLIGHT,P_SPINR(a)::QAR1(E)
- S(f);N_GUARD,P_SPINS(f)::QAR1(E),XS(f)
- Refutation
- K(d);P-FLIGHT,P_SPINP(e)
- Try
- Q(E);
- Threat
- S(H)
- Vars
- R(a);::QAR1(E)
- S(f);N_GUARD::QAR1(E),XS(f)
- Refutation
- S(f);XQ(E)
- Try
- Actual
- S(F);
- Vars
- K(d);P-FLIGHT,P_SPINR(a)::QAR2(E)
- K(d);P_SPINP(e),S_FLIGHT::QAB1(E)
- S(f);N_GUARD,XR(I)::QAR1(E)
- S(h);N_GUARD,XR(I)::QAR1(E)
- R(a);::QAB(E)
- S(f);N_GUARD::QAR1(E),XS(f)
- S(f);N_GUARD::QAR1(E)
- S(h);N_GUARD::QAR1(E),XS(h)
- S(h);N_GUARD::QAR1(E)
- P(e);SBLOCK::S(F)
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