MESON Chess Problem Database
Problem Display
PID: 213012 (q7/1PPP4/rp4Q1/n1kNN1R1/pp2KP2/1rp1p3/3bB3/8 w - - 0 1)
Madsen, Arthur Valdemar
Stella Polaris, 1967
#2
10 + 11
SOLUTION
- SOUND
- Sets
- 1...Ra7
- 2.Qxb6#
- 1...Sc4
- 2.Qc6#
- 1...Sc6
- 2.Qxc6#
- 1...Sxb7
- 2.Qc6#
- 1...Ra7
- Tries
- 1.Sxc3?
- threat
- 2.Sxa4#
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...Qxb7+
- 2.Sc6#
- 1...Rxc3
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...Sxb7
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 2.Qc6#
- 1...bxc3
- 2.Sc6#
- 1...Qd8
- 2.Sxa4#
- 1...Qe8
- 2.Sxa4#
- 1...Qf8
- 2.Sxa4#
- 2.Sf7#
- 1...Qg8
- 2.Sxa4#
- 2.Sf7#
- 1...Qh8
- 2.Sxa4#
- 1...Ra3
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...Sc4
- 2.Sd3#
- 2.Sxc4#
- 2.Qc6#
- 1...Sc6
- 2.Sxc6#
- 2.Qxc6#
- 1...a3
- 2.Sa4#
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...b5
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sf7#
- 1...Bxc3!
- threat
- 1.Sxe3?
- threat
- 2.Sd3#
- 2.Sf3#
- 2.S5c4#
- 2.S5g4#
- 2.Sc6#
- 2.Sf7#
- 1...Qxb7+
- 2.Sc6#
- 1...Bxe3
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...Sc4
- 2.Sd3#
- 2.S5xc4#
- 2.Qc6#
- 1...Qd8
- 2.Sd3#
- 1...Qf8
- 2.Sd3#
- 2.Sf7#
- 1...Qg8
- 2.Sd3#
- 2.Sf7#
- 1...Qh8
- 2.Sd3#
- 1...Sc6
- 2.Sd3#
- 2.Sxc6#
- 2.Qxc6#
- 1...b5
- 2.Sd3#
- 2.Sf3#
- 2.S5c4#
- 2.S5g4#
- 2.Sf7#
- 1...Qe8!
- threat
- 1.Sxb6?
- threat
- 2.Sd3#
- 2.Sf3#
- 2.Sec4#
- 2.Sg4#
- 2.Sf7#
- 2.Sxa4#
- 1...Rxb6
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sc6#
- 2.Sf7#
- 1...Sxb7
- 2.Sd3#
- 2.Sf3#
- 2.Sec4#
- 2.Sg4#
- 2.Sf7#
- 2.Qc6#
- 1...Sc4
- 2.Sd3#
- 2.Sexc4#
- 2.Qc6#
- 1...Sc6
- 2.Qxc6#
- 1...Qd8
- 2.Sd3#
- 2.Sxa4#
- 1...Qe8
- 2.Sxa4#
- 1...Qf8
- 2.Sd3#
- 2.Sf7#
- 2.Sxa4#
- 1...Qg8
- 2.Sd3#
- 2.Sf7#
- 2.Sxa4#
- 1...Qh8
- 2.Sd3#
- 2.Sxa4#
- 1...Ra3
- 2.Sd3#
- 2.Sf3#
- 2.Sec4#
- 2.Sg4#
- 2.Sf7#
- 1...a3
- 2.Sd3#
- 2.Sf3#
- 2.Sec4#
- 2.Sg4#
- 2.Sf7#
- 2.Sa4#
- 1...Qxb7+!
- threat
- 1.Se7?
- threat
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.S5c6#
- 2.Sf7#
- 1...Qxb7+
- 2.S5c6#
- 1...Sc4
- 2.Sd3#
- 2.Sxc4#
- 2.Qc6#
- 1...Qf8
- 2.Sf7#
- 1...Qg8
- 2.Sf7#
- 1...Sc6
- 2.S5xc6#
- 2.Qxc6#
- 1...b5
- 2.Sf3#
- 2.Sc4#
- 2.Sg4#
- 2.Sf7#
- 1...Qh8!
- threat
- 1.Sd3+?
- 1...Kb5
- 2.Sxe3#
- 2.Sxb6#
- 1...Kc4!
- 1...Kb5
- 1.Sf7?
- threat
- 2.Sxc3#
- 2.Sxe3#
- 2.Sxb6#
- 2.Se7#
- 2.Qd6#
- 1...Qe8+
- 2.Se7#
- 1...Qxb7
- 2.Qd6#
- 1...Sxb7
- 2.Sxc3#
- 2.Sxe3#
- 2.Sxb6#
- 2.Se7#
- 1...Qd8
- 2.Se7#
- 2.Qd6#
- 1...Qf8
- 2.Sxc3#
- 2.Sxe3#
- 2.Sxb6#
- 2.Se7#
- 1...Qh8
- 2.Qd6#
- 1...Sc6
- 2.Qd6#
- 1...c2
- 2.Sc3#
- 2.Sxe3#
- 2.Sxb6#
- 2.Se7#
- 2.Qd6#
- 1...b5
- 2.Sxc3#
- 2.Sxe3#
- 2.Sb6#
- 2.Se7#
- 1...Sc4!
- threat
- 1.Bxa6?
- threat
- 2.Sd3#
- 2.Qxb6#
- 1...Qxb7
- 2.Sd3#
- 1...Qa7
- 2.Sd3#
- 1...Qe8
- 2.Qxb6#
- 1...Sc4
- 2.Sd3#
- 2.Qc6#
- 1...Sc6
- 2.Sd3#
- 2.Qxc6#
- 1...c2
- 2.Qxb6#
- 1...b5
- 2.Qb6#
- 1...Qxa6!
- threat
- 1.bxa8Q?
- threat
- 2.Qf8#
- 1...Rxa8
- 2.Qxb6#
- 1...Sc4
- 2.Qac6#
- 2.Qgc6#
- 1...Sc6
- 2.Qaxc6#
- 2.Qgxc6#
- 1...Sb7
- 2.Qc6#
- 2.c8Q#
- 2.c8R#
- 1...b5!
- threat
- 1.c8Q+?
- 1...Sc6
- 2.Qgxc6#
- 2.Qcxc6#
- 1...Qxc8!
- 1...Sc6
- 1.c8R+?
- 1...Sc6
- 2.Rxc6#
- 2.Qxc6#
- 1...Qxc8!
- 1...Sc6
- 1.d8Q?
- threat
- 2.Sd7#
- 2.Qe7#
- 2.Qgd6#
- 2.Qdd6#
- 1...Sxb7
- 2.Sd7#
- 2.Qc6#
- 1...Sc4
- 2.Qc6#
- 1...Qc8
- 2.Qe7#
- 2.Qgd6#
- 2.Qdd6#
- 1...Sc6
- 2.Sd7#
- 2.Qxc6#
- 2.Qgd6#
- 2.Qdd6#
- 1...b5
- 2.Sd7#
- 1...Qxd8!
- threat
- 1.d8B?
- threat
- 2.Sd7#
- 2.Be7#
- 1...Sxb7
- 2.Sd7#
- 2.Qc6#
- 1...Sc4
- 2.Qc6#
- 1...Qc8
- 2.Be7#
- 1...Sc6
- 2.Sd7#
- 2.Qxc6#
- 1...b5
- 2.Sd7#
- 1...Qxd8!
- threat
- 1.d8R?
- threat
- 2.Sd7#
- 2.Qd6#
- 1...Sxb7
- 2.Sd7#
- 2.Qc6#
- 1...Sc4
- 2.Qc6#
- 1...Qc8
- 2.Qd6#
- 1...b5
- 2.Sd7#
- 1...Qxd8!
- threat
- 1.Sxc3?
- Keys
- 1.Sxb4!
- threat
- 2.Sec6#
- 1...Rxb4+
- 2.Sc4#
- 1...Kxb4
- 2.Qd6#
- 1...Sc4
- 2.Sed3#
- 1...Qd8
- 2.Sxa6#
- 1...Qe8
- 2.Sxa6#
- 1...Qf8
- 2.Sxa6#
- 1...Qg8
- 2.Sxa6#
- 1...Qh8
- 2.Sxa6#
- 1...Sc6
- 2.Sexc6#
- 1...b5
- 2.Sbd3#
- threat
- 1.Sxb4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 8
- REMOVED MATES = 2
- Sets
- R(i);N_GUARD::QAB1(G),XP(j)
- S(g);N_GUARD::QAR1(G)
- S(g);N_GUARD::QAR1(G),XS(g)
- S(g);N_GUARD,XP(H)::QAR1(G)
- Tries
- Try
- S(D);P_SPINP(H),XP(c)
- Threat
- DUALS(6)
- Vars
- Q(k);CHECK,XP(H)::R(F)+S(E)
- P(f);XS(D)::R(F)+S(E)
- Q(k);N_PINP(H)::S(D),XP(e)
- Q(k);N_PINP(H),P_PINS(E)::S(D),XP(e)
- Refutation
- B(a);XS(D)
- Try
- S(D);P_SPINP(H),XP(d)
- Threat
- DUALS(6)
- Vars
- Q(k);CHECK,XP(H)::R(F)+S(E)
- Q(k);N_PINP(H)::R(F)+S(E),DCHECK
- Refutation
- Q(k);N_PINP(H),P_PINS(E)
- Try
- S(D);P_SPINP(H),XP(j)
- Threat
- DUALS(6)
- Vars
- S(g);N_GUARD,N_PINP(H)::QAR1(G),XS(g)
- Q(k);N_PINP(H),P_PINS(E)::S(D),XP(e)
- Refutation
- Q(k);CHECK,XP(H)
- Try
- S(D);P_SPINP(H)
- Threat
- DUALS(5)
- Vars
- Q(k);CHECK,XP(H)::R(F)+S(E)
- Q(k);N_PINP(H)::R(F)+S(E)
- Refutation
- Q(k);N_PINP(H)
- Try
- S(E);CHECK
- Refutation
- K(h);P-FLIGHT
- Try
- S(E);
- Threat
- DUALS(5)
- Vars
- Q(k);CHECK::R(F)+S(D)
- Q(k);P_PINS(D),XP(H)::QAB1(G)
- Q(k);::QAB1(G)
- S(g);::QAB1(G)
- Refutation
- S(g);
- Try
- B(A);XR(i)
- Threat
- DUALS(2)
- Vars
- Q(k);P_PINS(D),XP(H)::S(E)
- Q(k);::S(E)
- Q(k);P_PINS(E)::QAB1(G),XP(j)
- P(c);::QAB1(G),XP(j)
- P(j);::QAB1(G)
- Refutation
- Q(k);XB(A)
- Try
- P(H);XQ(k)
- Threat
- QAB(H)
- Vars
- R(i);N_GUARD,XQ(H)::QAB1(G),XP(j)
- Refutation
- P(j);
- Try
- P(I);CHECK
- Refutation
- Q(k);XQ(I)
- Try
- P(I);CHECK
- Refutation
- Q(k);XR(I)
- Try
- P(J);
- Threat
- DUALS(4)
- Vars
- S(g);N_GUARD::QAR1(G)
- P(j);::S(E)
- Refutation
- Q(k);XQ(J)
- Try
- P(J);
- Threat
- DUALS(2)
- Vars
- S(g);N_GUARD::QAR1(G)
- Q(k);::B(J)
- P(j);::S(E)
- Refutation
- Q(k);XB(J)
- Try
- P(J);
- Threat
- DUALS(2)
- Vars
- S(g);N_GUARD::QAR1(G)
- Q(k);::QAB1(G)
- P(j);::S(E)
- Refutation
- Q(k);XR(J)
- Try
- Actual
- S(D);P_SPINP(H),XP(f)
- Threat
- R(F)+S(E)
- Vars
- R(b);CHECK,SBLOCK,XS(D)::R(F)+S(E)
- K(h);S_FLIGHT,XS(D)::QAB(G)
- S(g);SBLOCK::R(F)+S(E),DCHECK
- Q(k);N_GUARD,N_PINP(H)::S(D),XR(i)
- Q(k);N_GUARD,N_PINP(H),P_PINS(E)::S(D),XR(i)
- S(g);N_PINP(H)::R(F)+S(E),XS(g)
- P(j);SBLOCK::S(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).