MESON Chess Problem Database
Problem Display
PID: 213009 (2N5/6Nn/4b1Q1/Knk5/R4pq1/2P5/4pb2/7B w - - 0 1)
Klun, Joseph
Stella Polaris, 1967
#2
7 + 8
SOLUTION
- SOUND
- Sets
- 1...Qh5
- 2.Sxe6#
- 1...Qg1
- 2.Sxe6#
- 1...Qg3
- 2.Sxe6#
- 1...Qh4
- 2.Sxe6#
- 1...Qg5
- 2.Sxe6#
- 1...Ba2
- 2.Qb6#
- 2.Qc6#
- 1...Bb3
- 2.Qb6#
- 2.Qc6#
- 1...Bc4
- 2.Qb6#
- 2.Qc6#
- 1...Bd5
- 2.Qb6#
- 1...Bf5
- 2.Qb6#
- 2.Qc6#
- 1...Bd7
- 2.Qb6#
- 1...Bf7
- 2.Qb6#
- 2.Qc6#
- 1...Bxc8
- 2.Qb6#
- 2.Qc6#
- 1...Bg8
- 2.Qb6#
- 2.Qc6#
- 1...Qh5
- Tries
- 1.Rc4+?
- 1...Bxc4
- 2.Qb6#
- 2.Qc6#
- 1...Kxc4!
- 1...Bxc4
- 1.Qb1?
- threat
- 2.Qb4#
- 2.Qxb5#
- 1...Bxc8
- 2.Qb4#
- 1...Sxc3
- 2.Qb4#
- 2.Qb6#
- 1...Qf3
- 2.Qxb5#
- 1...Qg2
- 2.Qxb5#
- 1...Bd5
- 2.Qxb5#
- 1...f3
- 2.Qxb5#
- 1...Bc4
- 2.Qb4#
- 1...Bd7
- 2.Qb4#
- 1...Sa3
- 2.Qb4#
- 2.Qb6#
- 1...Sd4
- 2.Qb4#
- 2.Qb6#
- 1...Sd6
- 2.Qb4#
- 2.Qb6#
- 1...Sa7
- 2.Qb4#
- 2.Qb6#
- 1...Sc7
- 2.Qb4#
- 2.Qb6#
- 1...Bb3!
- threat
- 1.Qd3?
- threat
- 2.Qxb5#
- 1...Bxc8
- 2.Rc4#
- 2.Qd5#
- 1...Sxc3
- 2.Qd6#
- 1...Bc4
- 2.Rxc4#
- 2.Qxc4#
- 1...Bd7
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 1...Sa3
- 2.Qd6#
- 1...Sd6
- 2.Qxd6#
- 1...Sa7
- 2.Qd6#
- 1...Sc7
- 2.Qd6#
- 1...Sd4!
- threat
- 1.Qh5+?
- 1...Qf5
- 2.Sxe6#
- 1...Qxh5
- 2.Sxe6#
- 1...Qg5
- 2.Sxe6#
- 1...Bd5
- 2.Qxd5#
- 1...Bf5
- 2.Se6#
- 1...Sg5!
- 1...Qf5
- 1.Qg5+?
- 1...Qf5
- 2.Sxe6#
- 1...Qxg5
- 2.Sxe6#
- 1...Bd5
- 2.Qxd5#
- 1...Bf5
- 2.Se6#
- 1...Sxg5!
- 1...Qf5
- 1.Qxe6?
- threat
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qe5#
- 2.Qb6#
- 2.Qc6#
- 1...Qxe6
- 2.Sxe6#
- 1...Qxg7
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qb6#
- 2.Qc6#
- 1...Sxc3
- 2.Rc4#
- 2.Qc4#
- 2.Qb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe7#
- 1...e1Q
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qb6#
- 2.Qc6#
- 1...e1R
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qb6#
- 2.Qc6#
- 1...Sd4
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qe5#
- 2.Qb6#
- 2.Qd6#
- 2.Qe7#
- 1...Qf3
- 2.Rc4#
- 2.Qc4#
- 1...Qf5
- 2.Rc4#
- 2.Qc4#
- 2.Qxf5#
- 2.Qb6#
- 2.Qc6#
- 1...Qh5
- 2.Rc4#
- 2.Qc4#
- 2.Qb6#
- 2.Qc6#
- 1...Qg2
- 2.Rc4#
- 2.Qc4#
- 1...Qg5
- 2.Rc4#
- 2.Qc4#
- 2.Qb6#
- 2.Qc6#
- 1...Qg6
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qe5#
- 1...Bd4
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qb6#
- 2.Qc6#
- 1...Sa3
- 2.Qd5#
- 2.Qe5#
- 2.Qb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe7#
- 1...Sd6
- 2.Qd5#
- 2.Qe5#
- 2.Qxd6#
- 1...Sa7
- 2.Rc4#
- 2.Qc4#
- 2.Qd5#
- 2.Qe5#
- 2.Qb6#
- 2.Qd6#
- 2.Qe7#
- 1...Sc7
- 2.Rc4#
- 2.Qc4#
- 2.Qb6#
- 2.Qc6#
- 2.Qd6#
- 2.Qe7#
- 1...Sf6
- 2.Rc4#
- 2.Qc4#
- 2.Qb6#
- 2.Qc6#
- 1...f3!
- threat
- 1.Rc4+?
- Keys
- 1.Qe8!
- threat
- 2.Qxb5#
- 2.Qc6#
- 1...Bxc8
- 2.Qc6#
- 2.Qe5#
- 1...Sxc3
- 2.Qc6#
- 2.Qe7#
- 1...Qf3
- 2.Qxb5#
- 1...Qg2
- 2.Qxb5#
- 1...f3
- 2.Qxb5#
- 1...Sd4
- 2.Qe7#
- 1...Bc4
- 2.Qc6#
- 1...Bd5
- 2.Qxb5#
- 1...Bd7
- 2.Qe5#
- 1...Sa3
- 2.Qc6#
- 2.Qe7#
- 1...Sd6
- 2.Qc6#
- 1...Sa7
- 2.Qe7#
- 1...Sc7
- 2.Qc6#
- 2.Qe7#
- threat
- 1.Qe8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 7
- REMOVED MATES = 5
- Sets
- Q(d);N_GUARD::S(F),XB(g)
- B(g);OGATE::QAB1(E)
- Tries
- Try
- R(C);CHECK
- Refutation
- K(f);P-FLIGHT,XR(C)
- Try
- Q(E);
- Threat
- DUALS(2)
- Vars
- B(g);XS(G)::QAB1(E)
- Q(d);::QAR1(E),XS(e)
- B(g);::QAR1(E),XS(e)
- P(c);::QAR1(E),XS(e)
- B(g);::QAB1(E)
- Refutation
- B(g);
- Try
- Q(E);
- Threat
- QAR1(E),XS(e)
- Vars
- S(e);N_GUARD,XP(B)::QAB1(E)
- S(e);N_GUARD::QAB1(E)
- S(e);N_GUARD::QAB1(E),XS(e)
- Refutation
- S(e);
- Try
- Q(E);CHECK
- Vars
- Q(d);P_SPINQ(d)::S(F),XB(g)
- Q(d);XQ(E)::S(F),XB(g)
- B(g);N_GUARD,P_SPINB(g)::QAR1(E),XB(g)
- B(g);P_SPINB(g)::S(F)
- Refutation
- S(h);P_SPINS(h)
- Try
- Q(E);CHECK
- Vars
- Q(d);P_SPINQ(d)::S(F),XB(g)
- Q(d);XQ(E)::S(F),XB(g)
- B(g);N_GUARD,P_SPINB(g)::QAR1(E),XB(g)
- B(g);P_SPINB(g)::S(F)
- Refutation
- S(h);XQ(E)
- Try
- Q(E);XB(g)
- Threat
- DUALS(6)
- Vars
- Q(d);XQ(E)::S(F),XQ(d)
- Refutation
- P(c);
- Try
- Actual
- Q(E);
- Threat
- DUALS(2)
- Vars
- Q(d);::QAR1(E),XS(e)
- P(c);::QAR1(E),XS(e)
- S(e);N_GUARD::QAB(E)
- B(g);::QAR1(E)
- B(g);::QAR1(E),XS(e)
- B(g);OGATE::QAR2(E)
- S(e);::QAR1(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).