MESON Chess Problem Database
Problem Display
PID: 161808 (8/3rn3/B4q2/3p4/R4p1Q/3N1Kp1/2N3Rp/5k2 w - - 0 1)
Akerblom, Johan Axel
Stella Polaris, 1968
#2
7 + 8
| 15148 | Sadier Collection | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qa1
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Rxa1#
- 1...Qb2
- 2.Sxb2#
- 2.Sdb4#
- 1...Qxh4
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 1...Qe5
- 2.Sxe5#
- 1...Qg5
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 1...Qg7
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 1...Qh8
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 1...Qf5
- 2.Ra1#
- 1...Qc6
- 2.Ra1#
- 1...Qd6
- 2.Ra1#
- 1...Qg6
- 2.Ra1#
- 1...Qh6
- 2.Ra1#
- 1...Qf7
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 1...Qf8
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 1...Sc6
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 1...h1Q
- 2.Qxh1#
- 1...h1S
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...d4
- 2.Ra1#
- 1...Qa1
- Tries
- 1.Rf2+?
- 1...gxf2
- 2.Qxf2#
- 1...Kg1!
- 1...gxf2
- 1.Qxg3?
- threat
- 2.Rf2#
- 2.Qe1#
- 2.Qf2#
- 1...h1Q
- 2.Qe1#
- 2.Qf2#
- 1...h1S
- 2.Rg1#
- 2.Qe1#
- 1...h1B
- 2.Qe1#
- 2.Qf2#
- 1...Qc3
- 2.Rf2#
- 2.Qf2#
- 1...Qa1
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Rf2#
- 2.Rxa1#
- 2.Qf2#
- 1...Qd4
- 2.Qe1#
- 1...Qh4
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Rf2#
- 2.Ra1#
- 1...Qe5
- 2.Sxe5#
- 2.Rf2#
- 2.Qf2#
- 1...Qb6
- 2.Qe1#
- 1...Qe6
- 2.Rf2#
- 2.Qf2#
- 1...fxg3+!
- threat
- 1.Qxf6?
- threat
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 2.Qa1#
- 1...Rd6
- 2.Ra1#
- 2.Qa1#
- 1...Ra7
- 2.Ra1#
- 2.Qa1#
- 1...Rc7
- 2.Sc5#
- 2.Ra1#
- 2.Qa1#
- 1...d4
- 2.Ra1#
- 1...Rb7!
- threat
- 1.Qh3?
- threat
- 2.Rxg3#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Qh4
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 2.Ra1#
- 1...Qh8
- 2.Sc1#
- 2.Sde1#
- 2.Sb2#
- 2.Sf2#
- 2.Sdb4#
- 2.Sxf4#
- 2.Sc5#
- 2.Se5#
- 1...Qf5
- 2.Ra1#
- 1...Qh6
- 2.Ra1#
- 1...Qe6!
- threat
- 1.Rf2+?
- Keys
- 1.Qxf4!
- threat
- 2.Se3#
- 1...Qxf4+
- 2.Sxf4#
- 1...Qd4
- 2.Qc1#
- 1...Qe5
- 2.Sxe5#
- 1...Qb6
- 2.Qc1#
- 1...Qe6
- 2.Kxg3#
- 1...Sf5
- 2.Qc1#
- 1...d4
- 2.Ra1#
- threat
- 1.Qxf4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 9
- Sets
- Q(f);N_GUARD::B(G)+S(C),XQ(f)
- Q(f);N_GUARD::R(E)
- P(b);OGATE,P_PINR(B)::QAR2(F),XQ(b)
- P(b);OGATE::QAR2(F),XS(b)
- P(b);OGATE,P_PINR(B)::QAR2(F),XB(b)
- P(b);OGATE::QAR2(F),XR(b)
- P(e);S_CUTQ(f)::R(E)
- Tries
- Try
- R(B);CHECK
- Vars
- P(c);OGATE,XR(B)::QAR1(F),XP(c)
- Refutation
- K(a);P-FLIGHT
- Try
- Q(F);XP(c)
- Threat
- DUALS(3)
- Vars
- Q(f);::QAR1(F)
- Refutation
- P(d);CHECK,XQ(F)
- Try
- Q(F);XQ(f)
- Threat
- DUALS(10)
- Vars
- P(e);::R(E)
- Refutation
- R(g);
- Try
- Q(F);
- Threat
- QAB(F)+R(B),XP(c)
- Vars
- P(b);OGATE,P_PINR(B)::QAR2(F),XQ(b)
- P(b);OGATE,P_PINR(B)::QAR2(F),XB(b)
- P(b);OGATE::QAR2(F),XR(b)
- Q(f);N_GUARD::R(E)
- Refutation
- Q(f);
- Try
- Actual
- Q(F);P_SPINQ(F),XP(d)
- Threat
- S(A)
- Vars
- Q(f);CHECK,XQ(F)::B(G)+S(C),XQ(f)
- Q(f);N_PINQ(F)::QAR(F)
- Q(f);N_GUARD,N_PINQ(F)::B(G)+S(C),XQ(f)
- Q(f);N_GUARD,N_PINQ(F)::QAR(F)+K(D),XP(c)
- S(h);N_PINQ(F)::QAR(F)
- P(e);S_CUTQ(f)::R(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).