MESON Chess Problem Database
Problem Display
PID: 271875 (3bbq2/PPkppRN1/np5R/2N5/5nB1/K3p3/3Q3B/8 w - - 0 1)
Boswell, Edward
1st Prize, Sunday Referee, 1933
(First published on Sun Nov 26 1933)
#2
10 + 10
| 5454 | Near Snap | 2023 |
| 15239 | Valois Notebooks | 2023 |
SOLUTION
- SOUND
- Sets
- 1...Bxf7
- 2.Qxd7#
- 1...Sb4
- 2.b8Q#
- 1...Sxc5
- 2.b8Q#
- 1...Sb8
- 2.a8S#
- 1...b5
- 2.Qa5#
- 1...d5
- 2.Bxf4#
- 1...d6
- 2.Qxd6#
- 1...Bxf7
- Tries
- 1.Bxf4+?
- 1...d6
- 2.Qxd6#
- 1...e5!
- 1...d6
- 1.Bxd7?
- threat
- 2.Sge6#
- 2.Rc6#
- 1...Qxg7
- 2.Rc6#
- 1...Qxf7
- 2.Rc6#
- 1...Bxd7
- 2.Qxd7#
- 1...Bxf7
- 2.Rc6#
- 1...Sxc5
- 2.b8Q#
- 1...exd2
- 2.Rc6#
- 1...Sb4
- 2.Sge6#
- 2.b8Q#
- 2.b8B#
- 1...Sb8
- 2.Sge6#
- 2.a8S#
- 1...b5
- 2.Rc6#
- 2.Qa5#
- 1...e5
- 2.Rc6#
- 1...e6
- 2.Sxe6#
- 1...bxc5!
- threat
- 1.Rc6+?
- 1...dxc6
- 2.Sge6#
- 2.Bxf4#
- 1...Kxc6!
- 1...dxc6
- 1.Qd5?
- threat
- 2.Sxa6#
- 1...Sxc5
- 2.b8Q#
- 1...Sb4
- 2.b8Q#
- 1...Sb8
- 2.a8S#
- 1...e5
- 2.Rc6#
- 2.Qc6#
- 1...e6
- 2.Sxe6#
- 1...bxc5!
- threat
- 1.a8Q?
- threat
- 2.Sxa6#
- 2.Qc8#
- 1...Sxc5
- 2.Qc8#
- 2.b8Q#
- 1...bxc5
- 2.Qa5#
- 2.Qc8#
- 1...d6
- 2.Qxd6#
- 2.Qc8#
- 1...e6
- 2.Qc8#
- 1...Sb4
- 2.Qc8#
- 2.b8Q#
- 1...e5
- 2.Qc8#
- 1...Sb8!
- threat
- 1.Bxf4+?
- Keys
- 1.Bf3!
- threat
- 2.Sxa6#
- 1...Sxc5
- 2.b8Q#
- 1...bxc5
- 2.Qa5#
- 1...Sb4
- 2.b8Q#
- 1...Sb8
- 2.a8S#
- 1...d5
- 2.Bxf4#
- 1...d6
- 2.Qxd6#
- 1...e5
- 2.Rc6#
- 1...e6
- 2.Sxe6#
- threat
- 1.Bf3!
Anticipated by 59544(1922-1923)
This anticipates 200685(1948)
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 2
- Sets
- B(i);N_GUARD,XR(I)::QAR1(A),XP(f)
- S(c);N_GUARD::P=Q
- S(c);N_GUARD,XS(E)::P=Q
- S(c);SBLOCK::P=S
- P(d);OGATEB::QAB(A)
- P(f);N_GUARD,P_SPINP(g)::B(B),XS(b)
- P(f);N_SPINS(b),P_SPINP(g)::QAB1(A),XP(f)
- Tries
- Try
- B(B);CHECK,XS(b)
- Vars
- P(f);P_SPINP(f),S_CUTP(g)::QAB1(A),XP(f)
- Refutation
- P(g);P_PINS(E),P_SPINP(g)
- Try
- B(D);XP(f)
- Threat
- DUALS(2)
- Vars
- Q(j);XS(J)::R1(F)
- Q(j);XR(I)::R1(F)
- B(i);OGATE,XB(D)::QAR1(A),XB(i)
- B(i);XR(I)::R1(F)
- S(c);N_GUARD,XS(E)::P=Q
- P(a);XQ(A)::R1(F)
- P(g);N_SPINS(b),P_PINS(E)::R1(F)
- P(g);P_PINS(E)::S(J),XP(g)
- Refutation
- P(d);XS(E)
- Try
- R(F);CHECK
- Refutation
- K(e);N_SPINS(b),P-FLIGHT,XR(F)
- Try
- Q(A);
- Threat
- S(E),XS(c)
- Vars
- S(c);N_GUARD,XS(E)::P=Q
- S(c);N_GUARD::P=Q
- S(c);SBLOCK::P=S
- P(g);P_PINS(E),P_SPINP(f)::S(J),XP(g)
- Refutation
- P(d);XS(E)
- Try
- P(G);
- Threat
- DUALS(2)
- Vars
- P(g);P_PINS(E),P_SPINP(f)::QAR1(G)
- P(g);N_SPINS(b),P_PINS(E),P_SPINP(f)::QAR1(G)
- Refutation
- S(c);
- Try
- Actual
- B(D);
- Threat
- S(E),XS(c)
- Vars
- S(c);N_GUARD,XS(E)::P=Q
- P(d);OGATEB,XS(E)::QAB(A)
- S(c);N_GUARD::P=Q
- S(c);SBLOCK::P=S
- P(f);N_GUARD,P_SPINP(g)::B(B),XS(b)
- P(f);N_SPINS(b),P_SPINP(g)::QAB1(A),XP(f)
- P(g);N_SPINS(b),P_PINS(E),P_SPINP(f)::R1(F)
- P(g);P_PINS(E),P_SPINP(f)::S(J),XP(g)
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).