MESON Chess Problem Database
Problem Display
PID: 194493 (r1b5/q3p2P/r7/n1P2R1p/2Bk4/3NNP1K/1P2P3/2Q3b1 w - - 0 1)
Andrade, Barry Jack da Costa
The Observer, 1940
(First published on Sun Oct 6 1940)
#2
11 + 9
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Re6
- 2.Rd5#
- 1...Bxe3
- 2.Qc3#
- 1...Bxf5+
- 2.Sxf5#
- 1...Sxc4
- 2.Sc2#
- 1...e6
- 2.Rf4#
- 1...Re6
- Tries
- 1.Sd1?
- threat
- 2.Qf4#
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Qc7
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 2.Qc3#
- 1...Bh2
- 2.Qc3#
- 2.e3#
- 1...Be3
- 2.Qc3#
- 1...Bb7
- 2.Qc3#
- 1...e5
- 2.Qc3#
- 1...Bxf5+!
- threat
- 1.Sf1?
- threat
- 2.Qf4#
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Qc7
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 2.Qc3#
- 1...Bh2
- 2.Qc3#
- 2.e3#
- 1...Be3
- 2.Qc3#
- 1...Bb7
- 2.Qc3#
- 1...e5
- 2.Qc3#
- 1...Bxf5+!
- threat
- 1.Sg2?
- threat
- 2.Qf4#
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Qc7
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 2.Qc3#
- 1...Bh2
- 2.Qc3#
- 2.e3#
- 1...Be3
- 2.Qc3#
- 1...Bb7
- 2.Qc3#
- 1...e5
- 2.Qc3#
- 1...Bxf5+!
- threat
- 1.Sg4?
- threat
- 2.Rf4#
- 2.Rd5#
- 2.Qf4#
- 2.Qc3#
- 1...Qxc5
- 2.Rf4#
- 2.Qf4#
- 2.Qc3#
- 1...Bxf5
- 2.Qc3#
- 1...Sxc4
- 2.Qf4#
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Rd5#
- 2.Qc3#
- 1...Qc7
- 2.Rd5#
- 2.Qc3#
- 1...Qd7
- 2.Rf4#
- 2.Qf4#
- 2.Qc3#
- 1...Rd6
- 2.Rf4#
- 2.Qf4#
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 2.Qc3#
- 1...Rf6
- 2.Rd5#
- 2.Qf4#
- 2.Qc3#
- 1...Bh2
- 2.Rd5#
- 2.Qc3#
- 2.e3#
- 1...Be3
- 2.Rd5#
- 2.Qc3#
- 1...Be6
- 2.Rf4#
- 2.Qf4#
- 2.Qc3#
- 1...Bb7
- 2.Qc3#
- 1...e5
- 2.Qc3#
- 1...e6
- 2.Rf4#
- 2.Qf4#
- 2.Qc3#
- 1...hxg4+!
- threat
- 1.Sd5?
- threat
- 2.Qf4#
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Qc7
- 2.Qc3#
- 1...Re6
- 2.Qc3#
- 1...Bh2
- 2.Qc3#
- 2.e3#
- 1...Be3
- 2.Qc3#
- 1...e5
- 2.Qc3#
- 1...Bxf5+!
- threat
- 1.Ba2?
- threat
- 2.Sc2#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qxc5
- 2.Qxc5#
- 1...Bxe3
- 2.Qc3#
- 1...Sb3!
- threat
- 1.Bb3?
- threat
- 2.Sc2#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qxc5
- 2.Qxc5#
- 1...Bxe3
- 2.Qc3#
- 1...Sxb3!
- threat
- 1.Be6?
- threat
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Qxc5
- 2.Rf4#
- 2.Qxc5#
- 1...Rxe6
- 2.Rd5#
- 1...Qb6
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Qb8
- 2.Sc2#
- 2.Rd5#
- 1...Qc7
- 2.Sc2#
- 2.Rd5#
- 1...Qd7
- 2.Sc2#
- 2.Rf4#
- 2.h8Q#
- 2.h8B#
- 1...Rb6
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Rc6
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Rd6
- 2.Sc2#
- 2.Rf4#
- 2.h8Q#
- 2.h8B#
- 1...Rb8
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Bf2
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Bh2
- 2.Sc2#
- 2.Rd5#
- 1...Bb7
- 2.Sc2#
- 1...Bd7
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 1...Sb3
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Sc4
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 1...Sc6
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 1...Sb7
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...h4
- 2.Sc2#
- 2.Rf4#
- 2.Rd5#
- 2.h8Q#
- 2.h8B#
- 1...Bxe6!
- threat
- 1.Bf7?
- threat
- 2.Sc2#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qxc5
- 2.Qxc5#
- 1...Bxe3
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 1...e6
- 2.Rf4#
- 1...Be6!
- threat
- 1.h8Q+?
- 1...e5
- 2.Qxe5#
- 1...Rf6!
- 1...e5
- 1.h8B+?
- 1...e5
- 2.Bxe5#
- 1...Rf6!
- 1...e5
- 1.Sd1?
- Keys
- 1.Bg8!
- threat
- 2.Sc2#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qxc5
- 2.Qxc5#
- 1...Bxe3
- 2.Qc3#
- 1...Re6
- 2.Rd5#
- 1...Be6
- 2.h8Q#
- 2.h8B#
- 1...e6
- 2.Rf4#
- threat
- 1.Bg8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 1
- Sets
- R(e);N_PINR(J)::R1(J)
- B(a);SBLOCK,XS(E)::QAB1(A)
- B(i);CHECK,XR(J)::S(E),XB(i)
- S(c);SBLOCK,XB(H)::S(E)
- P(g);N_PINR(J)::R(J)
- Tries
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- Q(f);::QAB1(A)
- B(a);::QAB1(A)
- B(i);N_PINR(J)::QAB1(A)
- P(g);::QAB1(A)
- Refutation
- B(i);CHECK,XR(J)
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- Q(f);::QAB1(A)
- B(a);::QAB1(A)
- B(i);N_PINR(J)::QAB1(A)
- P(g);::QAB1(A)
- Refutation
- B(i);CHECK,XR(J)
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- Q(f);::QAB1(A)
- B(a);::QAB1(A)
- B(i);N_PINR(J)::QAB1(A)
- P(g);::QAB1(A)
- Refutation
- B(i);CHECK,XR(J)
- Try
- S(E);N_SPINR(J)
- Threat
- DUALS(4)
- Vars
- B(i);P_PINS(E),XR(J)::QAB1(A)
- Q(f);::QAB1(A)
- B(i);::QAB1(A)
- P(g);::QAB1(A)
- Refutation
- P(d);CHECK,XS(E)
- Try
- S(E);
- Threat
- DUALS(2)
- Vars
- Q(f);::QAB1(A)
- R(e);N_PINR(J)::QAB1(A)
- B(a);::QAB1(A)
- P(g);::QAB1(A)
- Refutation
- B(i);CHECK,XR(J)
- Try
- B(H);
- Threat
- S(E)
- Vars
- B(i);CHECK,XR(J)::S(E),XB(i)
- Q(f);OGATE,XP(I)::QAB1(A),XQ(f)
- B(a);SBLOCK,XS(E)::QAB1(A)
- Refutation
- S(c);
- Try
- B(H);
- Threat
- S(E)
- Vars
- B(i);CHECK,XR(J)::S(E),XB(i)
- Q(f);OGATE,XP(I)::QAB1(A),XQ(f)
- B(a);SBLOCK,XS(E)::QAB1(A)
- Refutation
- S(c);XB(H)
- Try
- B(H);N_SPINR(J)
- Threat
- DUALS(5)
- Vars
- R(e);XB(H)::R1(J)
- B(i);::S(E)
- Refutation
- B(i);P_PINR(J),XB(H)
- Try
- B(H);
- Threat
- S(E)
- Vars
- B(i);CHECK,XR(J)::S(E),XB(i)
- Q(f);OGATE,XP(I)::QAB1(A),XQ(f)
- B(a);SBLOCK,XS(E)::QAB1(A)
- R(e);N_PINR(J)::R1(J)
- P(g);N_PINR(J)::R(J)
- Refutation
- B(i);
- Try
- P(K);CHECK
- Vars
- P(g);P_SPINP(g)::QAB1(K),XP(g)
- Refutation
- R(e);P_SPINR(e)
- Try
- P(K);CHECK
- Vars
- P(g);P_SPINP(g)::B(K),XP(g)
- Refutation
- R(e);P_SPINR(e)
- Try
- Actual
- B(H);
- Threat
- S(E)
- Vars
- B(i);CHECK,XR(J)::S(E),XB(i)
- Q(f);OGATE,XP(I)::QAB1(A),XQ(f)
- B(a);SBLOCK,XS(E)::QAB1(A)
- R(e);N_PINR(J)::R1(J)
- B(i);S_CUTP(g),S_CUTR(e)::P=Q
- P(g);N_PINR(J)::R(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).