MESON Chess Problem Database
Problem Display
PID: 18117 (3n2K1/5P1n/RB2rkN1/6pP/3q2P1/p1N1R3/Q2r4/1B6 w - - 0 1)
Froberg, Johan Hilding Laurentius
Skakbladet, 1953
#2
11 + 8
SOLUTION
- SOUND
- Sets
- 1...Qxb6
- 2.Rf3#
- 1...Qd7
- 2.Rf3#
- 1...Rxa2
- 2.Bxd4#
- 1...Rb2
- 2.Bxd4#
- 1...Rc2
- 2.Bxd4#
- 1...Re2
- 2.Bxd4#
- 1...Rf2
- 2.Bxd4#
- 1...Rg2
- 2.Bxd4#
- 1...Rh2
- 2.Bxd4#
- 1...Rxe3
- 2.Bxd4#
- 2.Bxd8#
- 1...Re4
- 2.Bxd4#
- 2.Bxd8#
- 1...Re5
- 2.Bxd8#
- 1...Rd6
- 2.Bxd8#
- 1...Re7
- 2.Bxd4#
- 1...Re8+
- 2.fxe8S#
- 1...Sc6
- 2.Rxe6#
- 2.Qxe6#
- 1...Sb7
- 2.Rxe6#
- 2.Qxe6#
- 1...Sxf7
- 2.Rxe6#
- 2.Qxe6#
- 1...Qxb6
- Tries
- 1.Se4+?
- 1...Rxe4
- 2.Bxd4#
- 2.Bxd8#
- 1...Qxe4!
- 1...Rxe4
- 1.Qd5?
- threat
- 2.Bxd8#
- 2.Qf5#
- 1...Re8+
- 2.fxe8S#
- 1...Qxb6
- 2.Rf3#
- 2.Qf3#
- 2.Qf5#
- 1...Qxg4
- 2.Bxd8#
- 1...Rxb6
- 2.Qf5#
- 1...Sxf7
- 2.Rxe6#
- 2.Qxe6#
- 2.Qf5#
- 1...Qc5
- 2.Rf3#
- 1...Qe5
- 2.Bxd8#
- 1...Qd3
- 2.Bxd8#
- 1...Qb4
- 2.Qf5#
- 1...Qe4
- 2.Bxd8#
- 1...Qf4
- 2.Bxd8#
- 1...Rf2
- 2.Bxd4#
- 2.Bxd8#
- 1...Re5
- 2.Bxd8#
- 1...Re7
- 2.Bxd4#
- 2.Qf5#
- 1...Sc6
- 2.Rxe6#
- 2.Qxe6#
- 2.Qf5#
- 1...Sb7
- 2.Rxe6#
- 2.Qxe6#
- 2.Qf5#
- 1...Qxd5!
- threat
- 1.Qb2?
- threat
- 2.Sd5#
- 1...Re8+
- 2.fxe8S#
- 1...Qxc3
- 2.Rf3#
- 1...Rxb2
- 2.Bxd4#
- 1...Rxe3
- 2.Bxd4#
- 2.Bxd8#
- 1...Re4
- 2.Bxd4#
- 2.Bxd8#
- 1...Re5
- 2.Bxd8#
- 1...Qe5
- 2.Se4#
- 1...Qd5
- 2.Se4#
- 2.Sxd5#
- 1...Rd6
- 2.Bxd8#
- 1...axb2!
- threat
- 1.f8Q+?
- 1...Sf7
- 2.Rxe6#
- 2.Qxe6#
- 2.Qg7#
- 2.Qxf7#
- 1...Sxf8!
- 1...Sf7
- 1.f8S?
- threat
- 2.Sxh7#
- 1...Qd7
- 2.Rf3#
- 1...Re7
- 2.Bxd4#
- 1...Re8
- 2.Bxd4#
- 2.Bxd8#
- 1...Sxf8!
- threat
- 1.f8B?
- threat
- 2.Bg7#
- 1...Qd7
- 2.Rf3#
- 1...Re7
- 2.Bxd4#
- 2.Bxe7#
- 1...Re8
- 2.Bxd4#
- 2.Bxd8#
- 1...Sxf8!
- threat
- 1.f8R+?
- 1...Sf7
- 2.Rxe6#
- 2.Rxf7#
- 2.Qxe6#
- 1...Sxf8!
- 1...Sf7
- 1.Se4+?
- Keys
- 1.Qa1!
- threat
- 2.Sd5#
- 1...Re8+
- 2.fxe8S#
- 1...Qxc3
- 2.Rf3#
- 1...Rxe3
- 2.Bxd4#
- 2.Bxd8#
- 1...Re4
- 2.Bxd4#
- 2.Bxd8#
- 1...Re5
- 2.Bxd8#
- 1...Qe5
- 2.Se4#
- 1...Qd5
- 2.Se4#
- 2.Sxd5#
- 1...Rb2
- 2.Bxd4#
- 1...Rd6
- 2.Bxd8#
- threat
- 1.Qa1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 9
- Sets
- Q(c);N_GUARD,XB(H)::R(D)
- Q(c);N_GUARD::R(D)
- R(a);N_GUARD,XQ(B)::B(H),XQ(c)
- R(a);N_GUARD::B(H),XQ(c)
- R(e);::R(G)+B(H),DCHECK,XS(h)
- R(e);S_CUTQ(c)::B(H),XS(h)
- R(e);::R(G)+B(H),DCHECK,XQ(c)
- R(e);CHECK,OGATE::PXR(e)=S
- Tries
- Try
- S(C);CHECK
- Refutation
- Q(c);XS(C)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- R(e);CHECK,OGATE::PXR(e)=S
- Q(c);XP(E)::B(H),XS(h)
- R(e);P_SPINR(e),XB(H)::QAR1(B)
- Q(c);N_GUARD::R(D)
- Q(c);::B(H),XS(h)
- Q(c);::QAR1(B)
- R(e);::R(G)+B(H),DCHECK,XS(h)
- Refutation
- Q(c);XQ(B)
- Try
- Q(B);
- Threat
- S(C)
- Vars
- R(e);CHECK,OGATE::PXR(e)=S
- Q(c);N_GUARD,P_SPINQ(c),XS(C)::R(D)
- R(a);N_GUARD,XQ(B)::B(H),XQ(c)
- R(e);::R(G)+B(H),DCHECK,XS(h)
- Q(c);S_CUTR(e)::S(C)
- R(e);S_CUTQ(c)::B(H),XS(h)
- Refutation
- P(b);XQ(B)
- Try
- P(J);CHECK
- Refutation
- S(g);XQ(J)
- Try
- P(J);
- Threat
- S(J),XS(g)
- Vars
- Q(c);N_GUARD::R(D)
- R(e);::R(G)+B(H),DCHECK,XQ(c)
- Refutation
- S(g);XS(J)
- Try
- P(J);
- Threat
- B(J)
- Vars
- Q(c);N_GUARD::R(D)
- Refutation
- S(g);XB(J)
- Try
- P(J);CHECK
- Refutation
- S(g);XR(J)
- Try
- Actual
- Q(B);
- Threat
- S(C)
- Vars
- R(e);CHECK,OGATE::PXR(e)=S
- Q(c);N_GUARD,P_SPINQ(c),XS(C)::R(D)
- R(e);::R(G)+B(H),DCHECK,XS(h)
- Q(c);S_CUTR(e)::S(C)
- R(a);N_GUARD::B(H),XQ(c)
- R(e);S_CUTQ(c)::B(H),XS(h)
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).