MESON Chess Problem Database
Problem Display
PID: 145301 (3N3Q/2p5/P1PB1Pp1/RK3k2/1pB1N3/p4rpP/3b1pr1/3bRq2 w - - 0 1)
White, Alain Campbell
Good Companions, 1921
#2
12 + 12
SOLUTION
- SOUND
- Sets
- 1...Qxc4+
- 2.Kxc4#
- 1...Qg1
- 2.Be6#
- 1...Qh1
- 2.Be6#
- 1...Rb3
- 2.Ka4#
- 1...Rc3
- 2.Kxb4#
- 1...Rd3
- 2.Be6#
- 1...Ba4+
- 2.Kxa4#
- 1...Bc1
- 2.Kxb4#
- 1...Bg5
- 2.Kxb4#
- 1...Bh6
- 2.Kxb4#
- 1...g5
- 2.Qh7#
- 1...Qxc4+
- Tries
- 1.Qh5+?
- 1...Bg5
- 2.Kxb4#
- 2.Qg4#
- 2.Qxg5#
- 1...g5
- 2.Qh7#
- 1...gxh5!
- 1...Bg5
- 1.Qg8?
- threat
- 2.Qd5#
- 2.Qe6#
- 1...Qxc4+
- 2.Kxc4#
- 1...Ba4+
- 2.Kxa4#
- 1...Qd3
- 2.Qe6#
- 1...Rd3
- 2.Be6#
- 2.Qe6#
- 1...Bc3
- 2.Qe6#
- 1...Bf4
- 2.Qe6#
- 1...g5
- 2.Qh7#
- 1...cxd6!
- threat
- 1.f7?
- threat
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Qxc4+
- 2.Kxc4#
- 1...Ba4+
- 2.Kxa4#
- 1...Qxe1
- 2.Qe5#
- 1...Bxe1
- 2.Qe5#
- 1...fxe1Q
- 2.Qe5#
- 1...fxe1S
- 2.Qe5#
- 1...fxe1B
- 2.Qe5#
- 1...fxe1R
- 2.Qe5#
- 1...cxd6
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Qe2
- 2.Qe5#
- 1...Re3
- 2.Qe5#
- 1...Be2
- 2.Qe5#
- 1...Be3
- 2.Qe5#
- 1...g5
- 2.Qf6#
- 2.Qh7#
- 1...Qd3
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Qg1
- 2.Be6#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Qh1
- 2.Be6#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rg1
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rh2
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rb3
- 2.Ka4#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rc3
- 2.Kxb4#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rd3
- 2.Be6#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Rf4
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bc2
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bb3
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bc1
- 2.Kxb4#
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bf4
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bg5
- 2.Kxb4#
- 2.Qe5#
- 1...Bh6
- 2.Kxb4#
- 2.Qe5#
- 2.Qf6#
- 1...a2
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...b3
- 2.Qe5#
- 2.Qf6#
- 2.f8Q#
- 2.f8R#
- 1...Bc3!
- threat
- 1.Qh5+?
- Keys
- 1.Qh4!
- threat
- 2.Qg4#
- 1...Qxc4+
- 2.Kxc4#
- 1...Ba4+
- 2.Kxa4#
- 1...cxd6
- 2.Sxd6#
- 1...g5
- 2.Qh7#
- 1...Rb3
- 2.Ka4#
- 1...Rc3
- 2.Kxb4#
- 1...Rd3
- 2.Be6#
- 1...Re3
- 2.Qf4#
- 1...Rf4
- 2.Qg5#
- threat
- 1.Qh4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 5
- Sets
- Q(b);CHECK,XB(C)::R(E)+K(F),XQ(b)
- Q(b);N_PINB(C)::B(C)
- R(g);::R(E)+K(F)
- R(g);::R(E)+K(F),XP(i)
- R(g);N_PINB(C)::B(C)
- B(a);CHECK::R(E)+K(F),XB(a)
- B(c);::R(E)+K(F),XP(i)
- P(k);OGATEB::QAB(L)
- Tries
- Try
- Q(L);CHECK
- Vars
- P(k);OGATEB,P_SPINP(k)::QAB(L)
- Refutation
- P(k);XQ(L)
- Try
- Q(L);
- Threat
- DUALS(2)
- Vars
- Q(b);CHECK,XB(C)::R(E)+K(F),XQ(b)
- B(a);CHECK::R(E)+K(F),XB(a)
- Q(b);::QAB1(L)
- B(c);::QAB1(L)
- P(k);OGATEB::QAB(L)
- Refutation
- P(l);XB(I)
- Try
- P(J);
- Threat
- DUALS(4)
- Vars
- Q(b);CHECK,XB(C)::R(E)+K(F),XQ(b)
- B(a);CHECK::R(E)+K(F),XB(a)
- Q(b);N_PINB(C),XR(A)::QAR1(L)
- B(c);XR(A)::QAR1(L)
- P(d);XR(A)::QAR1(L)
- Q(b);::QAR1(L)
- R(g);::QAR1(L)
- B(a);::QAR1(L)
- B(c);::QAR1(L)
- Refutation
- B(c);
- Try
- Actual
- Q(L);
- Threat
- QAB1(L)
- Vars
- Q(b);CHECK,XB(C)::R(E)+K(F),XQ(b)
- B(a);CHECK::R(E)+K(F),XB(a)
- P(l);XB(I)::S(D),XP(l)
- P(k);OGATEB::QAB(L)
- R(g);::R(E)+K(F)
- R(g);::R(E)+K(F),XP(i)
- R(g);N_PINB(C)::B(C)
- R(g);N_GUARD,S_CUTB(c)::QAR1(L)
- R(g);S_CUTB(c)::QAR1(L)
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).