MESON Chess Problem Database
Problem Display
PID: 7954 (k4q2/1p1Npb2/2p2R2/1N6/5n2/3pn3/7Q/1KR3BB w - - 0 1)
Ulanov, Lev
The Problemist, 1994
#2
8 + 9
SOLUTION
- SOUND
- Sets
- 1...Qb8
- 2.Sb6#
- 1...Ba2+
- 2.Qxa2#
- 1...Bb3
- 2.Rxf8#
- 1...Bc4
- 2.Rxf8#
- 1...Bd5
- 2.Rxf8#
- 1...Bh5
- 2.Qa2#
- 1...Be6
- 2.Rxf8#
- 1...Bg6
- 2.Qa2#
- 1...Be8
- 2.Qa2#
- 1...Bg8
- 2.Rxf8#
- 1...Sd1
- 2.Sc7#
- 1...Sf1
- 2.Sc7#
- 1...Sc2
- 2.Sc7#
- 1...Seg2
- 2.Sc7#
- 1...Sc4
- 2.Sc7#
- 1...Sg4
- 2.Sc7#
- 1...Sed5
- 2.Qa2#
- 1...Sf5
- 2.Sc7#
- 1...Se2
- 2.Sb6#
- 1...Sfg2
- 2.Sb6#
- 1...Sh3
- 2.Sb6#
- 1...Sfd5
- 2.Qa2#
- 1...Sh5
- 2.Sb6#
- 1...Se6
- 2.Sb6#
- 2.Qa2#
- 1...Sg6
- 2.Sb6#
- 1...cxb5
- 2.Ra6#
- 1...c5
- 2.Ra6#
- 1...b6
- 2.Bxc6#
- 1...Qb8
- Tries
- 1.Rc4?
- threat
- 2.Ra4#
- 2.Qa2#
- 1...Bxc4
- 2.Rxf8#
- 1...Sxc4
- 2.Sc7#
- 1...cxb5
- 2.Ra6#
- 2.Qa2#
- 1...exf6
- 2.Ra4#
- 1...b6
- 2.Bxc6#
- 1...Qb8
- 2.Sb6#
- 1...Sc2
- 2.Sc7#
- 2.Ra4#
- 1...Seg2
- 2.Sc7#
- 2.Ra4#
- 1...Se2
- 2.Sb6#
- 2.Ra4#
- 1...Sfg2
- 2.Sb6#
- 2.Ra4#
- 1...d2
- 2.Ra4#
- 1...e5
- 2.Ra4#
- 1...e6
- 2.Ra4#
- 1...Qd8!
- threat
- 1.Rfxc6?
- threat
- 2.Ra6#
- 1...Ba2+
- 2.Qxa2#
- 1...bxc6
- 2.Bxc6#
- 1...b6
- 2.Rc8#
- 1...Qh6
- 2.Rc8#
- 1...Qb8
- 2.Sb6#
- 1...Seg2
- 2.Sc7#
- 1...Sed5
- 2.Qa2#
- 1...Sfg2
- 2.Sb6#
- 1...Sfd5
- 2.Qa2#
- 1...Bd5!
- threat
- 1.Qd2?
- threat
- 2.Qa5#
- 1...Ba2+
- 2.Qxa2#
- 1...b6
- 2.Bxc6#
- 1...Qb8
- 2.Sb6#
- 1...Sc4
- 2.Sc7#
- 1...Qd8!
- threat
- 1.Rc4?
- Keys
- 1.Rcxc6!
- threat
- 2.Ra6#
- 1...Ba2+
- 2.Qxa2#
- 1...bxc6
- 2.Bxc6#
- 1...b6
- 2.Rc8#
- 1...Qb8
- 2.Sb6#
- 1...Bd5
- 2.Rxf8#
- 1...Seg2
- 2.Sc7#
- 1...Sed5
- 2.Qa2#
- 1...Sfg2
- 2.Sb6#
- 1...Sfd5
- 2.Qa2#
- threat
- 1.Rcxc6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 19
- Sets
- Q(i);SBLOCK::S(H)
- B(g);CHECK,N_GUARD::QAR(E),XB(g)
- B(g);OGATE::R(G),XQ(i)
- B(g);N_GUARD::QAR(E)
- S(b);::S(F)
- S(b);S_CUTB(g)::QAR(E)
- S(c);::S(H)
- S(c);S_CUTB(g)::QAR(E)
- P(d);OGATE,P_SPINP(e),XS(F)::R(G)
- P(d);OGATE,P_SPINP(e)::R(G)
- P(e);OGATEB,P_SPINP(d)::B(D),XP(d)
- Tries
- Try
- R(B);
- Threat
- DUALS(2)
- Vars
- B(g);OGATE,XR(B)::R(G),XQ(i)
- S(b);XR(B)::S(F)
- P(f);XR(G)::R(B)
- P(e);OGATEB,P_SPINP(d)::B(D),XP(d)
- Q(i);SBLOCK::S(H)
- P(a);::R(B)
- P(f);::R(B)
- Refutation
- Q(i);
- Try
- R(G);XP(d)
- Threat
- R(G)
- Vars
- B(g);CHECK,N_GUARD::QAR(E),XB(g)
- P(e);OGATE,P_SPINP(e),XR(G)::B(D),XP(e)
- P(e);::B(D)+R(G),DCHECK
- Q(i);N_GUARD::R(G)
- Q(i);SBLOCK::S(H)
- S(b);::S(F)
- S(b);S_CUTB(g)::QAR(E)
- S(c);::S(H)
- S(c);S_CUTB(g)::QAR(E)
- Refutation
- B(g);
- Try
- Q(E);
- Threat
- QAR(E)
- Vars
- B(g);CHECK,N_GUARD::QAR(E),XB(g)
- P(e);OGATEB,P_SPINP(d)::B(D),XP(d)
- Q(i);SBLOCK::S(H)
- S(b);::S(F)
- Refutation
- Q(i);
- Try
- Actual
- R(B);XP(d)
- Threat
- R(B)
- Vars
- B(g);CHECK,N_GUARD::QAR(E),XB(g)
- P(e);OGATE,P_SPINP(e),XR(B)::B(D),XP(e)
- P(e);::B(D)+R(B),DCHECK
- Q(i);SBLOCK::S(H)
- B(g);OGATE::R(G),XQ(i)
- S(b);::S(F)
- S(b);S_CUTB(g)::QAR(E)
- S(c);::S(H)
- S(c);S_CUTB(g)::QAR(E)
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).