MESON Chess Problem Database
Problem Display
PID: 249949 (1n1B3K/r3pp2/7R/3pkNp1/1R2p3/7b/5Q1b/8 w - - 0 1)
Ellerman, Arnoldo
Stella Polaris, 1969
#2
6 + 10
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Bc7#
- 1...Ra2
- 2.Bc7#
- 1...Ra3
- 2.Bc7#
- 1...Ra4
- 2.Bc7#
- 1...Ra5
- 2.Bc7#
- 1...Rc7
- 2.Bxc7#
- 1...Ra8
- 2.Bc7#
- 1...Bxf5
- 2.Qxh2#
- 1...d4
- 2.Rb5#
- 1...e6
- 2.Bf6#
- 1...Ra1
- Tries
- 1.Sd4?
- threat
- 2.Qxh2#
- 1...e3
- 2.Qxe3#
- 1...Ra2
- 2.Bc7#
- 1...Ra3
- 2.Bc7#
- 1...Bg1
- 2.Qg3#
- 1...Bg3
- 2.Qxg3#
- 1...Bg2
- 2.Qf5#
- 1...g4
- 2.Qf5#
- 1...f5
- 2.Re6#
- 1...Bf4!
- threat
- 1.Sd6?
- threat
- 2.Sxf7#
- 2.Qxh2#
- 1...exd6
- 2.Qf6#
- 1...Be6
- 2.Qxh2#
- 1...d4
- 2.Rb5#
- 1...e6
- 2.Qxh2#
- 1...Bf4
- 2.Qd4#
- 1...Ra2
- 2.Sxf7#
- 1...Ra3
- 2.Sxf7#
- 1...Bg1
- 2.Sxf7#
- 2.Qg3#
- 1...Bg3
- 2.Sxf7#
- 2.Qxg3#
- 1...Bg2
- 2.Sxf7#
- 2.Qf5#
- 1...g4
- 2.Sxf7#
- 2.Qf5#
- 1...f5
- 2.Sf7#
- 1...f6!
- threat
- 1.Sxe7?
- threat
- 2.Qxh2#
- 2.Qf6#
- 1...Rxe7
- 2.Qf6#
- 1...Be6
- 2.Qxh2#
- 1...f6
- 2.Qxf6#
- 1...Bf4
- 2.Qd4#
- 1...Ra2
- 2.Bc7#
- 2.Qf6#
- 1...Ra3
- 2.Bc7#
- 2.Qf6#
- 1...Ra6
- 2.Qxh2#
- 1...Bg1
- 2.Qg3#
- 2.Qf6#
- 1...Bg3
- 2.Qxg3#
- 2.Qf6#
- 1...Bg2
- 2.Qf5#
- 2.Qf6#
- 1...Bf5
- 2.Qxh2#
- 2.Qxf5#
- 1...Sd7
- 2.Sc6#
- 2.Qxh2#
- 1...g4
- 2.Qf5#
- 2.Qf6#
- 1...f5!
- threat
- 1.Sd4?
- Keys
- 1.Sg7!
- threat
- 2.Qxh2#
- 1...d4
- 2.Rb5#
- 1...Bf4
- 2.Qd4#
- 1...Ra2
- 2.Bc7#
- 1...Ra3
- 2.Bc7#
- 1...Bg1
- 2.Qg3#
- 1...Bg3
- 2.Qxg3#
- 1...Bg2
- 2.Qf5#
- 1...g4
- 2.Qf5#
- 1...f5
- 2.Re6#
- threat
- 1.Sg7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 7
- Sets
- R(g);N_GUARD::B(E)
- R(g);N_GUARD::B(E),XR(g)
- B(b);SBLOCK,XS(C)::QAB(A),XB(a)
- P(d);OGATEB::R(B)
- P(h);OGATE,SBLOCK::B(E)
- Tries
- Try
- S(C);
- Threat
- QAB(A),XB(a)
- Vars
- P(c);OGATEB::QAR2(A),XP(c)
- R(g);N_GUARD::B(E)
- B(a);N_GUARD::QAB(A)
- B(a);N_GUARD::QAB(A),XB(a)
- B(b);N_GUARD::QAR1(A)
- P(f);S_CUTB(b)::QAR1(A)
- P(i);N_GUARD,S_CUTB(b)::R1(D)
- Refutation
- B(a);
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- P(h);N_GUARD,XS(C)::QAB1(A)
- B(b);::QAB(A),XB(a)
- P(d);OGATEB::R(B)
- P(h);::QAB(A),XB(a)
- B(a);SBLOCK::QAB1(A)
- R(g);::S(C),XP(i)
- P(i);::S(C)
- Refutation
- P(i);
- Try
- S(C);XP(h)
- Threat
- DUALS(2)
- Vars
- R(g);XS(C)::QAB1(A)
- B(b);::QAB(A),XB(a)
- P(i);::QAB1(A),XP(i)
- B(a);SBLOCK::QAB1(A)
- R(g);::QAB(A),XB(a)
- Refutation
- P(i);
- Try
- Actual
- S(C);
- Threat
- QAB(A),XB(a)
- Vars
- P(d);OGATEB::R(B)
- B(a);SBLOCK::QAB1(A)
- R(g);N_GUARD::B(E)
- B(a);N_GUARD::QAB(A)
- B(a);N_GUARD::QAB(A),XB(a)
- B(b);N_GUARD::QAR1(A)
- P(f);S_CUTB(b)::QAR1(A)
- P(i);N_GUARD,S_CUTB(b)::R1(D)
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).