MESON Chess Problem Database
Problem Display
PID: 199422 (4K3/8/2Q1p3/1pp5/2k1P2P/1pPn3q/3R4/1B1N4 w - - 0 1)
Robinson, PD
The Observer, 1945
(First published on Sun May 13 1945)
#2
8 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Qxe6#
- 1...Qg2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qg4
- 2.Bxd3#
- 1...Qf5
- 2.Bxd3#
- 1...Qh1
- 2.Bxd3#
- 2.Qxe6#
- 1...Qh2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qe3
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...Qxh4
- 2.Bxd3#
- 2.Qxe6#
- 1...Sc1
- 2.Rd4#
- 1...Se1
- 2.Rd4#
- 1...Sb2
- 2.Rd4#
- 1...Sf2
- 2.Rd4#
- 1...Sb4
- 2.Rd4#
- 1...Sf4
- 2.Rd4#
- 1...Se5
- 2.Rd4#
- 1...b2
- 2.Ba2#
- 1...b4
- 2.Qa6#
- 1...e5
- 2.Qd5#
- 1...Qf1
- Tries
- 1.Ke7?
- 1...b2
- 2.Ba2#
- 1...Qf1
- 2.Qxe6#
- 1...Qg2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qg4
- 2.Bxd3#
- 1...Qf5
- 2.Bxd3#
- 1...Qh1
- 2.Bxd3#
- 2.Qxe6#
- 1...Qh2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qe3
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...Sc1
- 2.Rd4#
- 1...Se1
- 2.Rd4#
- 1...Sb2
- 2.Rd4#
- 1...Sf2
- 2.Rd4#
- 1...Sb4
- 2.Rd4#
- 1...Sf4
- 2.Rd4#
- 1...Se5
- 2.Rd4#
- 1...b4
- 2.Qa6#
- 1...e5
- 2.Qd5#
- 1...Qxh4+!
- 1...b2
- 1.Kd8?
- 1...b2
- 2.Ba2#
- 1...Qf1
- 2.Qxe6#
- 1...Qg2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qg4
- 2.Bxd3#
- 1...Qf5
- 2.Bxd3#
- 1...Qh1
- 2.Bxd3#
- 2.Qxe6#
- 1...Qh2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qe3
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...Sc1
- 2.Rd4#
- 1...Se1
- 2.Rd4#
- 1...Sb2
- 2.Rd4#
- 1...Sf2
- 2.Rd4#
- 1...Sb4
- 2.Rd4#
- 1...Sf4
- 2.Rd4#
- 1...Se5
- 2.Rd4#
- 1...b4
- 2.Qa6#
- 1...e5
- 2.Qd5#
- 1...Qxh4+!
- 1...b2
- 1.Qxc5+?
- 1...Sxc5
- 2.Rd4#
- 1...Kxc5!
- 1...Sxc5
- 1.Qc8?
- 1...Qxh4
- 2.Bxd3#
- 2.Qxe6#
- 1...b2
- 2.Ba2#
- 1...b4
- 2.Qa6#
- 1...Qg4
- 2.Bxd3#
- 1...Qf1
- 2.Qxe6#
- 1...Qg2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qf5
- 2.Bxd3#
- 1...Qh1
- 2.Bxd3#
- 2.Qxe6#
- 1...Qh2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qe3
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...Sc1
- 2.Rd4#
- 1...Se1
- 2.Rd4#
- 1...Sb2
- 2.Rd4#
- 1...Sf2
- 2.Rd4#
- 1...Sb4
- 2.Rd4#
- 1...Sf4
- 2.Rd4#
- 1...Se5
- 2.Rd4#
- 1...e5!
- 1...Qxh4
- 1.h5?
- 1...b2
- 2.Ba2#
- 1...Qg4
- 2.Bxd3#
- 1...Qf1
- 2.Qxe6#
- 1...Qg2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qf5
- 2.Bxd3#
- 1...Qh1
- 2.Bxd3#
- 2.Qxe6#
- 1...Qh2
- 2.Bxd3#
- 2.Qxe6#
- 1...Qe3
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...Qh4
- 2.Bxd3#
- 2.Qxe6#
- 1...Sc1
- 2.Rd4#
- 1...Se1
- 2.Rd4#
- 1...Sb2
- 2.Rd4#
- 1...Sf2
- 2.Rd4#
- 1...Sb4
- 2.Rd4#
- 1...Sf4
- 2.Rd4#
- 1...Se5
- 2.Rd4#
- 1...b4
- 2.Qa6#
- 1...e5
- 2.Qd5#
- 1...Qxh5+!
- 1...b2
- 1.Ke7?
- Keys
- 1.Rc2!
- 1...Qxh4
- 2.Se3#
- 2.Qxe6#
- 1...bxc2
- 2.Ba2#
- 1...Sc1
- 2.Sb2#
- 1...Se1
- 2.Sb2#
- 1...Sb2
- 2.Sxb2#
- 1...Sf2
- 2.Sb2#
- 1...Sb4
- 2.Sb2#
- 1...Sf4
- 2.Sb2#
- 1...Se5
- 2.Sb2#
- 1...b2
- 2.Ba2#
- 1...Qg4
- 2.Se3#
- 1...Qf1
- 2.Se3#
- 2.Qxe6#
- 1...Qg2
- 2.Se3#
- 2.Qxe6#
- 1...Qf5
- 2.Se3#
- 1...Qh1
- 2.Se3#
- 2.Qxe6#
- 1...Qh2
- 2.Se3#
- 2.Qxe6#
- 1...Qe3
- 2.Sxe3#
- 2.Qxe6#
- 1...Qf3
- 2.Qxe6#
- 1...Qg3
- 2.Qxe6#
- 1...b4
- 2.Qa6#
- 1...e5
- 2.Qd5#
- 1...Qxh4
- 1.Rc2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 9
- ADDED MATES = 1
- REMOVED MATES = 2
- Sets
- Q(c);N_GUARD::QAB(G),XP(g)
- Q(c);N_GUARD::B(A),XS(b)
- S(b);OGATE::R1(C)
- P(a);OGATEB::B(A)
- P(e);OGATEB::QAB(G)
- P(g);N_GUARD::QAB1(G)
- Tries
- Try
- K(H);P-FLIGHT
- Vars
- P(a);OGATEB::B(A)
- Q(c);N_GUARD::QAB(G),XP(g)
- Q(c);N_GUARD::B(A),XS(b)
- S(b);OGATE::R1(C)
- P(e);OGATEB::QAB(G)
- P(g);N_GUARD::QAB1(G)
- Refutation
- Q(c);CHECK,XP(F)
- Try
- K(H);P-FLIGHT
- Vars
- P(a);OGATEB::B(A)
- Q(c);N_GUARD::QAB(G),XP(g)
- Q(c);N_GUARD::B(A),XS(b)
- S(b);OGATE::R1(C)
- P(e);OGATEB::QAB(G)
- P(g);N_GUARD::QAB1(G)
- Refutation
- Q(c);CHECK,XP(F)
- Try
- Q(G);CHECK,XP(f)
- Vars
- S(b);OGATE,SBLOCK,XQ(G)::R1(C)
- Refutation
- K(d);P-FLIGHT,XQ(G)
- Try
- Q(G);
- Vars
- P(a);OGATEB::B(A)
- P(e);OGATEB::QAB(G)
- Q(c);N_GUARD::B(A),XS(b)
- Q(c);N_GUARD::QAB(G),XP(g)
- S(b);OGATE::R1(C)
- Refutation
- P(g);
- Try
- P(F);
- Vars
- P(a);OGATEB::B(A)
- Q(c);N_GUARD::B(A),XS(b)
- Q(c);N_GUARD::QAB(G),XP(g)
- S(b);OGATE::R1(C)
- P(e);OGATEB::QAB(G)
- P(g);N_GUARD::QAB1(G)
- Refutation
- Q(c);CHECK,XP(F)
- Try
- Actual
- R(C);
- Vars
- P(a);OGATEB,XR(C)::B(A)
- S(b);N_GUARD::S(B)
- S(b);N_GUARD::S(B),XS(b)
- P(a);OGATEB::B(A)
- Q(c);N_GUARD::S(B)
- Q(c);N_GUARD::QAB(G),XP(g)
- P(e);OGATEB::QAB(G)
- P(g);N_GUARD::QAB1(G)
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