MESON Chess Problem Database
Problem Display
PID: 11439 (2QBq2N/r1n2Pn1/2pr3R/4k3/2P1B1p1/1pP2PK1/p7/3RN3 w - - 0 1)
Froberg, Johan Hilding Laurentius
Vart Hem, 1938
#2
12 + 10
SOLUTION
- SOUND
- Sets
- 1...Qxf7
- 2.Sxf7#
- 1...Rd3
- 2.Sxd3#
- 1...Rd4
- 2.cxd4#
- 1...Rf6
- 2.Bxf6#
- 1...Rg6
- 2.Sxg6#
- 1...Sd5
- 2.Sd3#
- 1...Sce6
- 2.Sg6#
- 2.Bf6#
- 1...Sf5+
- 2.Qxf5#
- 1...Sh5+
- 2.Rxh5#
- 1...Sge6
- 2.Sg6#
- 2.Bf6#
- 1...Qxf7
- Tries
- 1.Bc2?
- threat
- 2.f4#
- 1...Sf5+
- 2.Qxf5#
- 1...Sh5+
- 2.Rxh5#
- 1...Qxf7
- 2.Sxf7#
- 1...gxf3
- 2.Sxf3#
- 1...Rd3
- 2.Sxd3#
- 1...Rd4
- 2.cxd4#
- 1...Rf6
- 2.Bxf6#
- 1...Sd5
- 2.Sd3#
- 1...Sce6
- 2.Sg6#
- 2.Bf6#
- 1...Sge6
- 2.Sg6#
- 2.Bf6#
- 1...bxc2!
- threat
- 1.Rd4?
- threat
- 2.Sd3#
- 2.f4#
- 1...Sf5+
- 2.Qxf5#
- 1...Sh5+
- 2.Rxh5#
- 1...Qxf7
- 2.Sd3#
- 2.Sxf7#
- 1...gxf3
- 2.Sd3#
- 2.Sxf3#
- 1...Rf6
- 2.Sd3#
- 2.Bxf6#
- 1...Sd5
- 2.Sd3#
- 1...Sce6
- 2.Sd3#
- 2.Sg6#
- 2.Bf6#
- 1...Sge6
- 2.Sd3#
- 2.Sg6#
- 2.Bf6#
- 1...Rxd4!
- threat
- 1.Rd5+?
- 1...Sxd5
- 2.Sd3#
- 1...cxd5
- 2.Sd3#
- 1...Rxd5!
- 1...Sxd5
- 1.Rh5+?
- 1...Sf5+
- 2.Rxf5#
- 2.Qxf5#
- 1...Sxh5+!
- 1...Sf5+
- 1.Qxg4?
- threat
- 2.Qf4#
- 1...Sf5+
- 2.Qxf5#
- 1...Sh5+
- 2.Rxh5#
- 2.Qxh5#
- 1...Qxf7
- 2.Sxf7#
- 1...Rf6
- 2.Bxf6#
- 1...Rg6
- 2.Sxg6#
- 1...Sd5
- 2.Sd3#
- 1...Sce6
- 2.Sg6#
- 2.Bf6#
- 1...Sge6
- 2.Sg6#
- 2.Bf6#
- 2.Qf5#
- 1...Rxh6!
- threat
- 1.fxe8Q+?
- 1...Re6
- 2.Sg6#
- 2.Sf7#
- 2.Bf6#
- 1...Sce6
- 2.Sg6#
- 2.Bf6#
- 1...Sge6
- 2.Sg6#
- 2.Sf7#
- 2.Bf6#
- 2.Rh5#
- 1...Sgxe8
- 2.Sf7#
- 2.Rh5#
- 2.Qf5#
- 1...Scxe8!
- 1...Re6
- 1.fxe8R+?
- 1...Re6
- 2.Sg6#
- 2.Sf7#
- 2.Bf6#
- 1...Sce6
- 2.Sg6#
- 2.Bf6#
- 1...Sge6
- 2.Sg6#
- 2.Sf7#
- 2.Bf6#
- 2.Rh5#
- 1...Sgxe8
- 2.Sf7#
- 2.Rh5#
- 2.Qf5#
- 1...Scxe8!
- 1...Re6
- 1.Bc2?
- Keys
- 1.Bh7!
- threat
- 2.f4#
- 1...Sf5+
- 2.Qxf5#
- 1...Sh5+
- 2.Rxh5#
- 1...Qxf7
- 2.Sxf7#
- 1...gxf3
- 2.Sxf3#
- 1...Rd3
- 2.Sxd3#
- 1...Rd4
- 2.cxd4#
- 1...Rf6
- 2.Bxf6#
- 1...Rg6
- 2.Sxg6#
- 1...Sd5
- 2.Sd3#
- 1...Sce6
- 2.Bf6#
- 1...Sge6
- 2.Bf6#
- threat
- 1.Bh7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- Q(j);XP(I)::S(L),XQ(j)
- R(f);N_GUARD,P_PINP(D)::S(B),XR(f)
- R(f);OGATE::P(C),XR(f)
- R(f);N_GUARD::B(K),XR(f)
- R(f);N_GUARD::S(L),XR(f)
- S(h);S_CUTR(f)::S(B)
- S(i);CHECK,N_GUARD::QAR1(J),XS(i)
- S(i);CHECK,N_GUARD::R(H),XS(i)
- Tries
- Try
- B(G);
- Threat
- P(D)
- Vars
- S(i);CHECK,N_GUARD::QAR1(J),XS(i)
- S(i);CHECK,N_GUARD::R(H),XS(i)
- Q(j);XP(I)::S(L),XQ(j)
- P(c);XP(D)::S(B),XP(c)
- R(f);N_GUARD,P_PINP(D)::S(B),XR(f)
- R(f);OGATE::P(C),XR(f)
- R(f);N_GUARD::B(K),XR(f)
- S(h);S_CUTR(f)::S(B)
- Refutation
- P(b);XB(G)
- Try
- R(A);
- Threat
- DUALS(2)
- Vars
- S(i);CHECK,N_GUARD::QAR1(J),XS(i)
- S(i);CHECK,N_GUARD::R(H),XS(i)
- S(h);::S(B)
- Refutation
- R(f);XR(A)
- Try
- R(A);CHECK
- Vars
- S(h);XR(A)::S(B)
- P(e);XR(A)::S(B)
- Refutation
- R(f);XR(A)
- Try
- R(H);CHECK
- Refutation
- S(i);CHECK,XR(H)
- Try
- Q(J);XP(c)
- Threat
- QAB1(J)
- Vars
- S(i);CHECK,N_GUARD::QAR1(J),XS(i)
- Q(j);XP(I)::S(L),XQ(j)
- R(f);N_GUARD::B(K),XR(f)
- R(f);N_GUARD,P_PINQ(J)::S(L),XR(f)
- S(h);S_CUTR(f)::S(B)
- Refutation
- R(f);XR(H)
- Try
- P(I);CHECK,XQ(j)
- Refutation
- S(h);XQ(I)
- Try
- P(I);CHECK,XQ(j)
- Refutation
- S(h);XR(I)
- Try
- Actual
- B(G);
- Threat
- P(D)
- Vars
- S(i);CHECK,N_GUARD::QAR1(J),XS(i)
- S(i);CHECK,N_GUARD::R(H),XS(i)
- Q(j);XP(I)::S(L),XQ(j)
- P(c);XP(D)::S(B),XP(c)
- R(f);N_GUARD,P_PINP(D)::S(B),XR(f)
- R(f);OGATE::P(C),XR(f)
- R(f);N_GUARD::B(K),XR(f)
- R(f);N_GUARD::S(L),XR(f)
- S(h);S_CUTR(f)::S(B)
- S(h);S_CUTR(f)::B(K)
- S(i);S_CUTR(f)::B(K)
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).