MESON Chess Problem Database
Problem Display
PID: 102104 (2K4n/pN1BppR1/Pb4b1/3p4/Q2Pk2p/2pp3P/n7/1N3RB1 w - - 0 1)
Andrade, Barry Jack da Costa
The Observer, 1938
#2
11 + 12
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Bxd4
- 2.Qxd4#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...Bh5
- 2.Bf5#
- 1...Bh7
- 2.Rg4#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...d2
- 2.Qc2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bxd4
- Tries
- 1.Kb8?
- 1...Bxd4
- 2.Qxd4#
- 1...d2
- 2.Qc2#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...Bh5
- 2.Bf5#
- 1...Bh7
- 2.Rg4#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bc7+!
- 1...Bxd4
- 1.Bg4?
- 1...Bf5+
- 2.Bxf5#
- 1...Bxd4
- 2.Qxd4#
- 1...d2
- 2.Qc2#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bh5
- 2.Bf5#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bh7!
- 1...Bf5+
- 1.Rxg6?
- threat
- 2.Bf5#
- 2.Rg4#
- 1...Bxd4
- 2.Qxd4#
- 1...Sxg6
- 2.Bf5#
- 1...d2
- 2.Bf5#
- 2.Qc2#
- 1...Bc7
- 2.Sc5#
- 2.Bf5#
- 1...e6
- 2.Sd6#
- 2.Rg4#
- 1...f5
- 2.Bxf5#
- 2.Re6#
- 1...fxg6!
- threat
- 1.Rgxf7?
- threat
- 2.Re1#
- 2.R1f4#
- 2.R7f4#
- 2.Rxe7#
- 1...Bxd4
- 2.Re1#
- 2.Rxe7#
- 2.Qxd4#
- 1...Bxf7
- 2.Bf5#
- 1...d2
- 2.Qc2#
- 1...Bh5
- 2.Bf5#
- 2.R1f4#
- 2.R7f4#
- 2.Rxe7#
- 1...Bc5
- 2.Sxc5#
- 2.Re1#
- 2.R1f4#
- 2.R7f4#
- 1...Bc7
- 2.Sc5#
- 2.Re1#
- 1...Bd8
- 2.Sc5#
- 2.Re1#
- 2.R1f4#
- 2.R7f4#
- 1...Bf5
- 2.Bxf5#
- 1...Sc1
- 2.Sxc3#
- 2.R1f4#
- 2.R7f4#
- 2.Rxe7#
- 1...e5
- 2.Sd6#
- 2.Re1#
- 1...e6
- 2.Sd6#
- 2.Re1#
- 2.R1f4#
- 2.R7f4#
- 1...Sxf7!
- threat
- 1.Rh7?
- threat
- 2.Rxh4#
- 1...Bxd4
- 2.Qxd4#
- 1...d2
- 2.Qc2#
- 1...Bh5
- 2.Bf5#
- 1...Bc7
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...f5
- 2.Rxe7#
- 1...Bxh7!
- threat
- 1.Qd1?
- threat
- 2.Qf3#
- 2.Qg4#
- 2.Qe1#
- 1...d2
- 2.Qc2#
- 2.Qe2#
- 2.Qf3#
- 1...Bh5
- 2.Bf5#
- 1...Bc7
- 2.Sc5#
- 2.Qf3#
- 2.Qe1#
- 1...Bf5
- 2.Bxf5#
- 2.Qf3#
- 2.Qe1#
- 1...Sc1
- 2.Sxc3#
- 2.Qf3#
- 2.Qg4#
- 1...f5
- 2.Rxe7#
- 2.Qf3#
- 2.Qe1#
- 1...Bxd4!
- threat
- 1.Qb3?
- 1...d2
- 2.Qc2#
- 1...Bh5
- 2.Bf5#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...Bh7
- 2.Rg4#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bxd4!
- 1...d2
- 1.Qb5?
- 1...Bh5
- 2.Bf5#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...Bh7
- 2.Rg4#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...d2
- 2.Qe2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bxd4!
- 1...Bh5
- 1.Qxa2?
- threat
- 2.Sxc3#
- 2.Qg2#
- 1...d2
- 2.Qc2#
- 1...Bh5
- 2.Sxc3#
- 2.Bf5#
- 1...Ba5
- 2.Sc5#
- 2.Qg2#
- 1...c2
- 2.Sd2#
- 2.Sc3#
- 1...Bxd4!
- threat
- 1.Qb4?
- threat
- 2.Qxe7#
- 1...Bxd4
- 2.Qxd4#
- 1...Sxb4
- 2.Sxc3#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...d2!
- threat
- 1.Kb8?
- Keys
- 1.Qc4!
- 1...Bxd4
- 2.Qxd4#
- 1...dxc4
- 2.Bc6#
- 1...Bh5
- 2.Bf5#
- 1...Ba5
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 1...Bc7
- 2.Sc5#
- 1...Bd8
- 2.Sc5#
- 1...Bf5
- 2.Bxf5#
- 1...Bh7
- 2.Rg4#
- 1...Sc1
- 2.Sxc3#
- 1...Sb4
- 2.Sxc3#
- 1...c2
- 2.Sd2#
- 1...d2
- 2.Qe2#
- 1...e5
- 2.Sd6#
- 1...e6
- 2.Sd6#
- 1...f5
- 2.Rxe7#
- 1...f6
- 2.Rxe7#
- 1...Bxd4
- 1.Qc4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- B(h);N_GUARD::B(I)
- B(h);OGATE::R(J)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(c);OGATEB::QAB(E)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
- Tries
- Try
- K(K);P-FLIGHT
- Vars
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- P(c);OGATEB::QAB(E)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD::B(I),XB(h)
- B(h);N_GUARD::B(I)
- B(h);OGATE::R(J)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
- Refutation
- B(g);CHECK
- Try
- B(I);
- Vars
- B(h);CHECK,N_GUARD::B(I),XB(h)
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- P(c);OGATEB::QAB(E)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD::B(I)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
- Refutation
- B(h);
- Try
- R(J);XB(h)
- Threat
- DUALS(2)
- Vars
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- S(l);XR(J)::B(I)
- Refutation
- P(k);XR(J)
- Try
- R(J);XP(k)
- Threat
- DUALS(4)
- Vars
- B(h);N_GUARD,XR(J)::B(I)
- P(c);OGATEB::QAB(E)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- Refutation
- S(l);XR(J)
- Try
- R(J);
- Threat
- R(J),XP(e)
- Vars
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- P(c);OGATEB::QAB(E)
- B(h);N_GUARD::B(I)
- B(g);N_GUARD::S(H)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- P(k);OGATE::R(J),XP(j)
- Refutation
- B(h);XR(J)
- Try
- Q(E);
- Threat
- DUALS(3)
- Vars
- B(h);N_GUARD::B(I)
- Refutation
- B(g);XP(F)
- Try
- Q(E);
- Vars
- P(c);OGATEB::QAB(E)
- B(h);N_GUARD::B(I)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- B(h);OGATE::R(J)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
- Refutation
- B(g);XP(F)
- Try
- Q(E);
- Vars
- B(h);N_GUARD::B(I)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- B(h);OGATE::R(J)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(c);OGATE::QAR2(E)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
- Refutation
- B(g);XP(F)
- Try
- Q(E);XS(a)
- Threat
- DUALS(2)
- Vars
- P(c);OGATEB::QAB(E)
- Refutation
- B(g);XP(F)
- Try
- Q(E);
- Threat
- QAR(E),XP(j)
- Vars
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- S(a);N_GUARD,XQ(E)::S(A),XP(b)
- B(g);N_GUARD::S(H),XB(g)
- B(g);N_GUARD::S(H)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- P(j);N_GUARD::S(H)
- Refutation
- P(c);
- Try
- Actual
- Q(E);
- Vars
- B(g);OGATE,P_SPINB(g),XP(F)::QAR1(E),XB(g)
- P(f);OGATEB,XQ(E)::B(I)
- B(h);N_GUARD::B(I)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- B(h);N_GUARD,P_PINB(I)::B(I),XB(h)
- B(h);OGATE::R(J)
- S(a);N_GUARD::S(A),XP(b)
- P(b);N_GUARD::S(A)
- P(c);OGATE::QAR2(E)
- P(j);N_GUARD::S(H)
- P(k);OGATE::R(J),XP(j)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).