MESON Chess Problem Database
Problem Display
PID: 12298 (6B1/2B2q1r/4N1R1/3k4/Q5n1/2pN2n1/b2bPPp1/K2R4 w - - 0 1)
Froberg, Johan Hilding Laurentius
Problemas, 1977
#2
10 + 9
SOLUTION
- SOUND
- Sets
- 1...Qxe6
- 2.Bxe6#
- 1...Qxg6
- 2.Sdf4#
- 2.Sef4#
- 1...Qe8
- 2.Sdf4#
- 2.Sef4#
- 1...Qxg8
- 2.Sdf4#
- 1...Qxf2
- 2.Sef4#
- 1...Qf3
- 2.Sef4#
- 1...Qf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Qf5
- 2.Sef4#
- 1...Qf6
- 2.Sef4#
- 1...Qxc7
- 2.Sef4#
- 2.Sxc7#
- 1...Qd7
- 2.Sdf4#
- 2.Sef4#
- 1...Qe7
- 2.Sdf4#
- 2.Sef4#
- 1...Qg7
- 2.Sdf4#
- 2.Sef4#
- 2.Sxg7#
- 1...Qf8
- 2.Sef4#
- 1...Bc4
- 2.Qa8#
- 1...Bc1
- 2.Sxc1#
- 2.Sdf4#
- 1...Be1
- 2.Sxe1#
- 2.Sdf4#
- 2.Sef4#
- 1...Be3
- 2.Sdf4#
- 1...Bf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Bg5
- 2.Sdf4#
- 1...Bh6
- 2.Sdf4#
- 1...Sf1
- 2.e4#
- 1...Sh1
- 2.e4#
- 1...Sf5
- 2.Sdf4#
- 2.e4#
- 1...Sh5
- 2.e4#
- 1...Se3
- 2.Sef4#
- 1...Sf6
- 2.Sdf4#
- 1...Qxe6
- Tries
- 1.Sb4+?
- 1...Ke4
- 2.Qc2#
- 1...Kc4!
- 1...Ke4
- 1.Sg7?
- threat
- 2.Bxf7#
- 2.Rd6#
- 1...Qxg8
- 2.Rd6#
- 1...Rxg7
- 2.Rd6#
- 1...Bf4
- 2.Bxf7#
- 1...Qe6
- 2.Bxe6#
- 1...Rh6
- 2.Bxf7#
- 1...Se4
- 2.Bxf7#
- 1...Sf5
- 2.Bxf7#
- 2.e4#
- 1...Se5
- 2.Rd6#
- 1...Sf6
- 2.Bxf7#
- 1...Sh6
- 2.Rd6#
- 1...Bc4!
- threat
- 1.Bxg3?
- threat
- 2.Sc7#
- 2.e4#
- 1...Qxe6
- 2.Bxe6#
- 2.e4#
- 1...Qxg6
- 2.Sc7#
- 1...Qxg8
- 2.e4#
- 1...Sxf2
- 2.Sc7#
- 1...Qf4
- 2.Sexf4#
- 2.Sc7#
- 1...Bf4
- 2.Sexf4#
- 1...Se5
- 2.Sc7#
- 1...Sf6
- 2.Sc7#
- 1...Qf3
- 2.Sef4#
- 2.Sc7#
- 1...Qf5
- 2.Sef4#
- 2.Sc7#
- 1...Qc7
- 2.Sef4#
- 2.Sxc7#
- 2.e4#
- 1...Be3
- 2.Sc7#
- 1...Se3
- 2.Sef4#
- 2.Sc7#
- 1...Bc4!
- threat
- 1.Bb8?
- threat
- 2.Sc7#
- 1...Qxe6
- 2.Bxe6#
- 1...Qxg6
- 2.Sdf4#
- 2.Sef4#
- 1...Qxg8
- 2.Sdf4#
- 1...Qc7
- 2.Sef4#
- 2.Sxc7#
- 1...Sf6
- 2.Sdf4#
- 1...Bf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Qf6
- 2.Sef4#
- 1...Bc4!
- threat
- 1.Bxf7?
- threat
- 2.Sdf4#
- 2.Sef4#
- 2.Sg7#
- 1...Sxe2
- 2.Sef4#
- 2.Sg7#
- 1...Bc4
- 2.Qa8#
- 1...Bf4
- 2.Sdxf4#
- 2.Sexf4#
- 2.Sg7#
- 1...Rg7
- 2.Sdf4#
- 2.Sef4#
- 2.Sxg7#
- 1...Sh5
- 2.Sef4#
- 2.Sg7#
- 2.e4#
- 1...Se5
- 2.Sdf4#
- 2.Sef4#
- 1...Sh6
- 2.Sdf4#
- 2.Sef4#
- 1...Rxf7!
- threat
- 1.Rg5+?
- 1...Qf5
- 2.Sdf4#
- 2.Sef4#
- 2.Sg7#
- 1...Bxg5
- 2.Sdf4#
- 1...Sf5
- 2.Sdf4#
- 1...Se5
- 2.Rxe5#
- 1...Kxe6!
- 1...Qf5
- 1.Rf6?
- threat
- 2.Sdf4#
- 1...Qxe6
- 2.Bxe6#
- 1...Qxf6
- 2.Sef4#
- 1...Qxc7
- 2.Sef4#
- 2.Sxc7#
- 1...Bc4
- 2.Qa8#
- 1...Bf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Sh5
- 2.e4#
- 1...Sxe2!
- threat
- 1.fxg3?
- threat
- 2.e4#
- 1...Qxg6
- 2.Sdf4#
- 2.Sef4#
- 1...Qxc7
- 2.Sef4#
- 2.Sxc7#
- 1...Bc4
- 2.Qa8#
- 1...Sf6
- 2.Sdf4#
- 1...Qf3
- 2.Sef4#
- 1...Qf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Qf5
- 2.Sef4#
- 1...Be3
- 2.Sdf4#
- 1...Se3
- 2.Sef4#
- 1...Sf2!
- threat
- 1.Sb4+?
- Keys
- 1.e3!
- threat
- 2.Sef4#
- 1...Qxe6
- 2.Bxe6#
- 1...Bxe3
- 2.Sdf4#
- 1...Bc4
- 2.Qa8#
- 1...Qf4
- 2.Sdxf4#
- 2.Sexf4#
- 1...Se2
- 2.e4#
- 1...Sh5
- 2.e4#
- threat
- 1.e3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 12
- Sets
- Q(h);OGATE,P_SPINQ(h),XS(G)::B(J),XQ(h)
- Q(h);N_GUARD,XB(J)::S(E)
- Q(h);XP(D)::B(J)+S(G),DCHECK
- Q(h);::B(J)+S(G),DCHECK
- B(a);SBLOCK::QAB(F)
- B(b);::R(B)+S(E),DCHECK
- S(e);N_GUARD::P(C)
- S(f);S_CUTB(b)::S(G)
- S(f);S_CUTQ(h)::S(E)
- Tries
- Try
- S(E);CHECK,P_PINB(b)
- Vars
- K(g);N_SPINB(b),S_FLIGHT::QAB(F)
- Refutation
- K(g);N_SPINB(b),S_FLIGHT
- Try
- S(G);P_PINQ(h)
- Threat
- DUALS(2)
- Vars
- Q(h);N_SPINQ(h),XB(J)::R1(H)
- R(i);XS(G)::R1(H)
- B(b);::B(J),XQ(h)
- Q(h);OGATE::B(J),XQ(h)
- R(i);::B(J),XQ(h)
- S(e);::B(J),XQ(h)
- S(f);::R1(H)
- S(f);::B(J),XQ(h)
- Refutation
- B(a);
- Try
- B(I);XS(e)
- Threat
- DUALS(2)
- Vars
- Q(h);XR(H)::B(J)+S(G),DCHECK
- Q(h);XB(J)::P(C)
- S(f);XP(D)::S(G)
- B(b);N_GUARD::S(G),XB(b)
- S(f);::S(G)
- B(b);::S(G)
- Refutation
- B(a);
- Try
- B(I);
- Threat
- S(G)
- Vars
- Q(h);OGATE,P_SPINQ(h),XS(G)::B(J),XQ(h)
- Q(h);N_GUARD,XB(J)::S(E)
- S(f);S_CUTQ(h)::S(E)
- Q(h);::B(J)+S(G),DCHECK
- Refutation
- B(a);
- Try
- B(J);XQ(h)
- Threat
- DUALS(3)
- Vars
- B(a);SBLOCK::QAB(F)
- Refutation
- R(i);XB(J)
- Try
- R(H);CHECK
- Vars
- B(b);XR(H)::R(B)+S(E),DCHECK
- S(e);P_SPINS(e)::S(E)
- S(f);N_GUARD,P_SPINS(f)::R1(H),XS(f)
- Refutation
- K(g);P_SPINQ(h),S_FLIGHT,XS(G)
- Try
- R(H);
- Threat
- S(E)
- Vars
- Q(h);OGATE,P_SPINQ(h),XS(G)::B(J),XQ(h)
- Q(h);XR(H)::B(J)+S(G),DCHECK
- B(a);SBLOCK::QAB(F)
- S(e);N_GUARD::P(C)
- Refutation
- S(e);XP(C)
- Try
- P(D);XS(e)
- Threat
- P(C)
- Vars
- B(a);SBLOCK::QAB(F)
- S(f);S_CUTQ(h)::S(E)
- Q(h);::B(J)+S(G),DCHECK
- B(b);::R(B)+S(E),DCHECK
- S(f);S_CUTB(b)::S(G)
- Refutation
- S(f);
- Try
- Actual
- P(C);
- Threat
- S(G)
- Vars
- Q(h);OGATE,P_SPINQ(h),XS(G)::B(J),XQ(h)
- B(b);XP(C)::R(B)+S(E),DCHECK
- B(a);SBLOCK::QAB(F)
- S(e);N_GUARD::P(C)
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).