MESON Chess Problem Database
Problem Display
PID: 310 (8/8/1pn2K1p/7R/N2pkp2/7Q/3PNP2/4n3 w - - 0 1)
Andrade, Barry Jack da Costa
The Observer, 1922
(First published on Sun Nov 12 1922)
#2
7 + 7
| 887 | Mate in Two Moves | 1931 |
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Sc2
- 2.d3#
- 1...Sg2
- 2.d3#
- 1...Sd3
- 2.f3#
- 1...Sf3
- 2.Qf5#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...d3
- 2.Sac3#
- 1...f3
- 2.Qf5#
- 1...b5
- 2.Sc5#
- 1...Sc2
- Tries
- 1.Ke6?
- 1...Sf3
- 2.Qf5#
- 1...f3
- 2.Qf5#
- 1...Sc2
- 2.d3#
- 1...Sg2
- 2.d3#
- 1...Sd3
- 2.f3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...d3
- 2.Sac3#
- 1...b5
- 2.Sc5#
- 1...Sd8+!
- 1...Sf3
- 1.Sc1?
- 1...Se5
- 2.Rxe5#
- 1...f3
- 2.Qg4#
- 2.Qf5#
- 2.Qh4#
- 1...Sc2
- 2.Qd3#
- 2.d3#
- 2.f3#
- 1...Sg2
- 2.Qd3#
- 2.d3#
- 2.f3#
- 1...Sd3
- 2.Qxd3#
- 2.f3#
- 1...Sf3
- 2.Qf5#
- 2.d3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...b5
- 2.Sc5#
- 1...d3!
- 1...Se5
- 1.Sg1?
- threat
- 2.Qf5#
- 1...Se5
- 2.Rxe5#
- 1...Se7
- 2.Re5#
- 1...d3!
- threat
- 1.Sxb6?
- 1...Sf3
- 2.Qf5#
- 1...f3
- 2.Qf5#
- 1...Sc2
- 2.d3#
- 1...Sg2
- 2.d3#
- 1...Sd3
- 2.f3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...d3!
- 1...Sf3
- 1.Rb5?
- 1...Sf3
- 2.Qf5#
- 1...f3
- 2.Qf5#
- 1...Sc2
- 2.d3#
- 1...Sg2
- 2.d3#
- 1...Sd3
- 2.f3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...d3
- 2.Sac3#
- 1...h5!
- 1...Sf3
- 1.Qg3?
- 1...Sf3
- 2.Qg6#
- 1...Se5
- 2.Rxe5#
- 1...f3
- 2.Qg6#
- 1...Sg2
- 2.d3#
- 1...Sc2
- 2.d3#
- 1...Sd3
- 2.f3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...d3
- 2.Sac3#
- 2.Qxf4#
- 1...b5
- 2.Sc5#
- 1...fxg3!
- 1...Sf3
- 1.f3+?
- 1...Sxf3
- 2.Qf5#
- 1...Kd3!
- 1...Sxf3
- 1.Ke6?
- Keys
- 1.Qb3!
- 1...Sd3
- 2.Qd5#
- 1...d3
- 2.Qd5#
- 1...Sg2
- 2.f3#
- 1...Sc2
- 2.f3#
- 1...Sf3
- 2.d3#
- 1...Sb4
- 2.Re5#
- 1...Sa5
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sa7
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sb8
- 2.Re5#
- 1...Sd8
- 2.Re5#
- 1...f3
- 2.Rh4#
- 1...b5
- 2.Sc5#
- 1...Sd3
- 1.Qb3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::P(A)
- S(a);N_GUARD,SBLOCK::P(C)
- S(a);SBLOCK::QAB1(D)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- P(b);N_GUARD::S(E)
- P(d);::QAB1(D)
- P(e);N_GUARD::S(E)
- Tries
- Try
- K(G);P-FLIGHT
- Vars
- S(a);SBLOCK::QAB1(D)
- P(d);::QAB1(D)
- S(a);N_GUARD::P(A)
- S(a);N_GUARD,SBLOCK::P(C)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- P(b);N_GUARD::S(E)
- P(e);N_GUARD::S(E)
- Refutation
- S(f);CHECK
- Try
- S(B);
- Vars
- S(f);N_GUARD::R1(F),XS(f)
- S(f);N_GUARD::R1(F)
- P(e);N_GUARD::S(E)
- Refutation
- P(b);
- Try
- S(B);
- Threat
- QAB1(D)
- Vars
- S(f);N_GUARD::R1(F),XS(f)
- S(f);N_GUARD::R1(F)
- Refutation
- P(b);
- Try
- S(E);XP(e)
- Vars
- S(a);SBLOCK::QAB1(D)
- P(d);::QAB1(D)
- S(a);N_GUARD::P(A)
- S(a);N_GUARD,SBLOCK::P(C)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- Refutation
- P(b);
- Try
- R(F);
- Vars
- S(a);SBLOCK::QAB1(D)
- P(d);::QAB1(D)
- S(a);N_GUARD::P(A)
- S(a);N_GUARD,SBLOCK::P(C)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- P(b);N_GUARD::S(E)
- Refutation
- P(g);
- Try
- Q(D);
- Vars
- S(a);SBLOCK::QAB(D)
- S(f);N_GUARD::R1(F),XS(f)
- P(d);SBLOCK::QAB(D)
- S(a);N_GUARD::P(A)
- S(a);N_GUARD,SBLOCK::P(C)
- S(f);N_GUARD::R1(F)
- P(e);N_GUARD::S(E)
- Refutation
- P(d);XQ(D)
- Try
- P(C);CHECK
- Vars
- S(a);SBLOCK,XP(C)::QAB1(D)
- Refutation
- K(c);S_FLIGHT
- Try
- Actual
- Q(D);
- Vars
- S(a);SBLOCK::QAB1(D)
- P(b);::QAB1(D)
- S(a);N_GUARD::P(C)
- S(a);N_GUARD,SBLOCK::P(A)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- P(d);OGATEB::R(F)
- P(e);N_GUARD::S(E)
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