MESON Chess Problem Database
Problem Display
PID: 18941 (6nK/8/1N6/b3N2R/r4k1n/r2p1P2/bPP2Q1P/8 w - - 0 1)
Froberg, Johan Hilding Laurentius
Sahs, 1959
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Rb3
- 2.Sd5#
- 1...Rc3
- 2.Qd2#
- 1...Rb4
- 2.Qd2#
- 1...Rc4
- 2.Sd5#
- 1...Rd4
- 2.Qxd4#
- 1...Bb1
- 2.Sd5#
- 1...Bb3
- 2.Sxd3#
- 1...Bc4
- 2.Qd4#
- 1...Bd5
- 2.Sxd5#
- 1...Bd2
- 2.Qxd2#
- 1...Bb4
- 2.Qd4#
- 1...Sg2
- 2.Sg6#
- 1...Sxf3
- 2.Qxf3#
- 1...Sf5
- 2.Sg6#
- 1...Sg6+
- 2.Sxg6#
- 1...Rb3
- Tries
- 1.Sbc4?
- threat
- 2.Qe3#
- 2.Qg3#
- 2.Qd4#
- 2.Qxh4#
- 1...Sg6+
- 2.Sxg6#
- 1...Bxc4
- 2.Qd4#
- 1...Sxf3
- 2.Qe3#
- 2.Qxf3#
- 1...dxc2
- 2.Qg3#
- 2.Qd4#
- 2.Qxh4#
- 1...Be1
- 2.Qe3#
- 2.Qd4#
- 1...Bd2
- 2.Qg3#
- 2.Qd4#
- 2.Qxh4#
- 2.Qxd2#
- 1...Bc3
- 2.Qe3#
- 2.Qg3#
- 2.Qxh4#
- 1...Bb6
- 2.Qg3#
- 2.Qxh4#
- 1...Bd8
- 2.Qe3#
- 2.Qg3#
- 2.Qd4#
- 2.Qd2#
- 1...Sg2
- 2.Sg6#
- 2.Qg3#
- 2.Qd4#
- 1...Sf5
- 2.Sg6#
- 1...Sf6
- 2.Qe3#
- 2.Qg3#
- 1...Sh6
- 2.Qe3#
- 2.Qg3#
- 2.Qd4#
- 1...d2
- 2.Qg3#
- 2.Qd4#
- 2.Qxh4#
- 1...Rxc4!
- threat
- 1.bxa3?
- threat
- 2.Sxd3#
- 1...Sg6+
- 2.Sxg6#
- 1...Rxa3
- 2.Qd4#
- 1...Sxf3
- 2.Qxf3#
- 1...dxc2
- 2.Sd3#
- 1...Rd4
- 2.Qxd4#
- 1...Bc4
- 2.Qd4#
- 1...d2
- 2.Sd3#
- 1...Bc3!
- threat
- 1.b4?
- threat
- 2.Qd4#
- 2.Qd2#
- 1...Sg6+
- 2.Sxg6#
- 1...Rxb4
- 2.Qd2#
- 1...Bxb4
- 2.Qd4#
- 1...Sxf3
- 2.Qxf3#
- 1...dxc2
- 2.Qd4#
- 1...Sf5
- 2.Sg6#
- 1...Bd5
- 2.Sxd5#
- 2.Qd2#
- 1...Sg2
- 2.Sg6#
- 2.Qd4#
- 1...Sf6
- 2.Qd2#
- 1...d2
- 2.Qd4#
- 1...Bxb6!
- threat
- 1.c3?
- threat
- 2.Sxd3#
- 2.Qd2#
- 1...Sg6+
- 2.Sxg6#
- 1...Rxc3
- 2.Qd2#
- 1...Bxb6
- 2.Sxd3#
- 1...Sxf3
- 2.Qxf3#
- 1...Sf5
- 2.Sxd3#
- 2.Sg6#
- 1...Rd4
- 2.Qxd4#
- 2.Qd2#
- 1...Re4
- 2.Sxd3#
- 1...Bb1
- 2.Sd5#
- 2.Qd2#
- 1...Bc4
- 2.Qd4#
- 2.Qd2#
- 1...Sg2
- 2.Sxd3#
- 2.Sg6#
- 1...d2
- 2.Sd3#
- 2.Qxd2#
- 1...Bxc3!
- threat
- 1.Sbc4?
- Keys
- 1.b3!
- threat
- 2.Sxd3#
- 2.Sd5#
- 1...Sg6+
- 2.Sxg6#
- 1...Rxb3
- 2.Sd5#
- 1...Bxb3
- 2.Sxd3#
- 1...Bxb6
- 2.Sxd3#
- 1...Sxf3
- 2.Qxf3#
- 1...dxc2
- 2.Sd3#
- 2.Sd5#
- 1...Sf5
- 2.Sxd3#
- 2.Sg6#
- 1...Rd4
- 2.Qxd4#
- 1...Bc3
- 2.Sd5#
- 1...Sf6
- 2.Sxd3#
- 1...Se7
- 2.Sxd3#
- 1...d2
- 2.Sd3#
- 2.Sd5#
- threat
- 1.b3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 10
- Sets
- R(b);S_CUTB(a)::S(H)
- R(b);S_CUTB(g)::QAB(C)
- R(d);S_CUTB(g)::QAB(C)
- R(d);S_CUTB(a)::S(H)
- R(d);N_GUARD::QAR2(C),XR(d)
- B(a);N_GUARD::S(H)
- B(a);S_CUTR(b)::S(F),XP(c)
- B(a);S_CUTR(d)::QAR2(C)
- B(a);N_GUARD::S(H),XB(a)
- B(g);N_GUARD::QAB(C),XB(g)
- B(g);S_CUTR(d)::QAR2(C)
- S(f);N_GUARD::S(F)
- S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
- S(f);CHECK,N_GUARD::S(F),XS(f)
- Tries
- Try
- S(H);
- Threat
- DUALS(4)
- Vars
- S(f);CHECK,N_GUARD::S(F),XS(f)
- B(a);XS(H)::QAR2(C)
- S(f);N_GUARD::S(F)
- Refutation
- R(d);XS(H)
- Try
- P(A);XR(b)
- Threat
- S(F),XP(c)
- Vars
- S(f);CHECK,N_GUARD::S(F),XS(f)
- R(d);N_GUARD,XP(A)::QAR2(C)
- S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
- P(c);XP(B)::S(F)
- R(d);N_GUARD::QAR2(C),XR(d)
- B(a);S_CUTR(d)::QAR2(C)
- P(c);::S(F)
- Refutation
- B(g);P_PINS(F)
- Try
- P(A);
- Threat
- DUALS(2)
- Vars
- S(f);CHECK,N_GUARD::S(F),XS(f)
- R(d);XP(A)::QAB(C)
- B(g);XP(A)::QAR2(C)
- S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
- P(c);XP(B)::QAR2(C)
- S(f);N_GUARD::S(F)
- S(h);::QAB(C)
- P(c);::QAR2(C)
- Refutation
- B(g);XS(H)
- Try
- P(B);
- Threat
- DUALS(2)
- Vars
- S(f);CHECK,N_GUARD::S(F),XS(f)
- R(b);XP(B)::QAB(C)
- B(g);XS(H)::S(F),XP(c)
- S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
- R(d);::S(F),XP(c)
- Refutation
- B(g);P_PINS(F),XP(B)
- Try
- Actual
- P(A);
- Threat
- DUALS(2)
- Vars
- S(f);CHECK,N_GUARD::S(F),XS(f)
- R(b);XP(A)::S(H)
- B(a);XP(A)::S(F),XP(c)
- B(g);XS(H)::S(F),XP(c)
- S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
- R(d);N_GUARD::QAR2(C),XR(d)
- B(g);P_PINS(F)::S(H)
- S(h);::S(F),XP(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).