MESON Chess Problem Database
Problem Display
PID: 148904 (2NB1n1b/2p5/2P5/2N1kP2/1n1pPp2/8/6Q1/3K4 w - - 0 1)
Rothstein, Louis
Good Companions (April Complete Blocks), 1918
#2
8 + 7
SOLUTION
- SOUND
- Sets
- 1...Bf6
- 2.Bxc7#
- 1...Bg7
- 2.Qxg7#
- 1...Sa2
- 2.Sd3#
- 1...Sc2
- 2.Sd3#
- 1...Sd3
- 2.Sxd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Sxc6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bf6
- Tries
- 1.Kc1?
- 1...Sd3+
- 2.Sxd3#
- 1...Sxc6
- 2.Sd3#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bf6
- 2.Bxc7#
- 1...Bg7
- 2.Qxg7#
- 1...Sc2
- 2.Sd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Sa2+!
- 1...Sd3+
- 1.Ke1?
- 1...Sd3+
- 2.Sxd3#
- 1...Sxc6
- 2.Sd3#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bf6
- 2.Bxc7#
- 1...Bg7
- 2.Qxg7#
- 1...Sa2
- 2.Sd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Sc2+!
- 1...Sd3+
- 1.Kd2?
- 1...Sxc6
- 2.Sd3#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bf6
- 2.Bxc7#
- 1...Bg7
- 2.Qxg7#
- 1...Sa2
- 2.Sd3#
- 1...Sc2
- 2.Sd3#
- 1...Sd3
- 2.Sxd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...d3!
- 1...Sxc6
- 1.Bh4?
- 1...Sxc6
- 2.Sd3#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bg7
- 2.Qxg7#
- 1...Sa2
- 2.Sd3#
- 1...Sc2
- 2.Sd3#
- 1...Sd3
- 2.Sxd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Bf6!
- 1...Sxc6
- 1.Be7?
- 1...Sxc6
- 2.Sd3#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 2.Qg3#
- 1...Bg7
- 2.Qxg7#
- 1...Sa2
- 2.Sd3#
- 1...Sc2
- 2.Sd3#
- 1...Sd3
- 2.Sxd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Bf6!
- 1...Sxc6
- 1.Qh1?
- threat
- 2.Qxh8#
- 1...f3
- 2.Qh2#
- 1...Bf6
- 2.Bxc7#
- 1...Sd5
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Bg7!
- threat
- 1.Qe2?
- 1...Sxc6
- 2.Sd3#
- 1...d3
- 2.Qb2#
- 1...f3
- 2.Qh2#
- 1...Bf6
- 2.Bxc7#
- 1...Sa2
- 2.Sd3#
- 1...Sc2
- 2.Sd3#
- 1...Sd3
- 2.Sxd3#
- 1...Sd5
- 2.Sd3#
- 1...Sa6
- 2.Sd3#
- 1...Se6
- 2.Sd7#
- 1...Sg6
- 2.Sd7#
- 1...Sd7
- 2.Sxd7#
- 1...Sh7
- 2.Sd7#
- 1...Bg7!
- 1...Sxc6
- 1.Qg5?
- threat
- 2.Bxc7#
- 2.f6#
- 1...Bf6
- 2.Bxf6#
- 2.Bxc7#
- 2.Qxf6#
- 1...Sd5
- 2.f6#
- 1...Sa6
- 2.f6#
- 1...Se6
- 2.fxe6#
- 1...Sh7
- 2.Bxc7#
- 2.Qe7#
- 1...d3!
- threat
- 1.f6?
- threat
- 2.Qg5#
- 1...Bxf6
- 2.Bxc7#
- 1...d3
- 2.Qb2#
- 1...Se6
- 2.Sd7#
- 1...Sh7!
- threat
- 1.Kc1?
- Keys
- 1.Qg8!
- threat
- 2.Qxh8#
- 1...f3
- 2.Qg3#
- 1...Bg7
- 2.Qxg7#
- 1...Bf6
- 2.Bxc7#
- 1...Sd5
- 2.Qxd5#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Sd7
- 2.Qe6#
- 2.Qe8#
- 1...Sh7
- 2.Qe6#
- 2.Qe8#
- threat
- 1.Qg8!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 3
- ADDED MATES = 1
- REMOVED MATES = 8
- Sets
- B(g);SBLOCK::B(H),XP(e)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- S(a);N_GUARD,XP(F)::S(D)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- P(b);OGATEB::QAB(B)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- S(a);CHECK,N_GUARD::S(D),XS(a)
- S(a);N_GUARD,XP(F)::S(D)
- P(b);OGATEB::QAB(B)
- B(g);SBLOCK::B(H),XP(e)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- S(a);CHECK
- Try
- K(A);P-FLIGHT
- Vars
- S(a);CHECK,N_GUARD::S(D),XS(a)
- S(a);N_GUARD,XP(F)::S(D)
- P(b);OGATEB::QAB(B)
- B(g);SBLOCK::B(H),XP(e)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- S(a);CHECK
- Try
- K(A);P-FLIGHT
- Vars
- S(a);N_GUARD,XP(F)::S(D)
- B(g);SBLOCK::B(H),XP(e)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- P(b);
- Try
- B(H);
- Vars
- S(a);N_GUARD,XP(F)::S(D)
- P(b);OGATEB::QAB(B)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- B(g);
- Try
- B(H);
- Vars
- S(a);N_GUARD,XP(F)::S(D)
- P(b);OGATEB::QAB(B)
- B(g);N_GUARD::QAB(B),XB(g)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- B(g);
- Try
- Q(B);
- Threat
- QAB(B),XB(g)
- Vars
- P(c);OGATEB::QAB(B)
- B(g);SBLOCK::B(H),XP(e)
- S(a);N_GUARD::S(D)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- B(g);
- Try
- Q(B);
- Vars
- S(a);N_GUARD,XP(F)::S(D)
- P(b);OGATEB::QAB(B)
- P(c);OGATEB::QAB(B)
- B(g);SBLOCK::B(H),XP(e)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- S(f);N_GUARD::S(D)
- S(f);N_GUARD::S(D),XS(f)
- Refutation
- B(g);
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- S(a);::QAR(B)+P(E)
- S(f);OGATE::QAR(B)+P(E),XS(f)
- Refutation
- P(b);
- Try
- P(E);
- Threat
- QAR2(B)
- Vars
- B(g);SBLOCK,XP(E)::B(H),XP(e)
- P(b);OGATEB::QAB(B)
- S(f);N_GUARD,SBLOCK::S(D)
- Refutation
- S(f);
- Try
- Actual
- Q(B);
- Threat
- QAB(B),XB(g)
- Vars
- P(c);OGATEB::QAB(B)
- B(g);N_GUARD::QAB(B),XB(g)
- B(g);SBLOCK::B(H),XP(e)
- S(a);N_GUARD::QAR1(B),XS(a)
- S(f);N_GUARD::QAR1(B),XS(f)
- S(f);N_GUARD::QAR1(B)
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).