MESON Chess Problem Database
Problem Display
PID: 11441 (3r3q/B1r2B2/bN6/R4n1n/1R1PkP2/7N/1pP1pPP1/1Q2K3 w - - 0 1)
Jonsson, Gustav
1st Prize, Vart Hem, 1938
#2
13 + 9
| 3098 | FIDE Album (1914-1944) (I) | 1971 |
| 133 | The Problemist Supplement | 2016 |
SOLUTION
- SOUND
- Sets
- 1...Qxd4
- 2.Re5#
- 1...Qe5
- 2.Rxe5#
- 1...Qh6
- 2.Re5#
- 1...Qh7
- 2.Re5#
- 1...Qf8
- 2.Re5#
- 1...Qg8
- 2.Re5#
- 1...Rc4
- 2.c3#
- 1...Rxd4
- 2.Bd5#
- 1...Rd5
- 2.Bxd5#
- 1...Ra8
- 2.Bd5#
- 1...Rb8
- 2.Bd5#
- 1...Rc8
- 2.Bd5#
- 1...Re8
- 2.Bd5#
- 1...Rf8
- 2.Bd5#
- 1...Rg8
- 2.Bd5#
- 1...Bd3
- 2.cxd3#
- 1...Bb7
- 2.c3#
- 1...Bc8
- 2.c3#
- 1...Se3
- 2.f3#
- 1...Sxd4
- 2.Bg6#
- 1...Sfg7
- 2.Re5#
- 1...Sxf4
- 2.Sg5#
- 1...Sf6
- 2.Re5#
- 1...Shg7
- 2.Re5#
- 1...Qxd4
- Tries
- 1.Sc4?
- threat
- 2.Sd2#
- 2.c3#
- 2.f3#
- 1...Qxd4
- 2.Sd2#
- 2.f3#
- 1...Rxc4
- 2.c3#
- 1...Rxa7
- 2.Sd2#
- 2.c3#
- 1...Rxd4
- 2.Sd2#
- 2.f3#
- 1...Sxd4
- 2.Sd2#
- 1...Sxf4
- 2.Sg5#
- 2.Sd2#
- 2.f3#
- 1...Rc5
- 2.Sd2#
- 2.c3#
- 1...Se3
- 2.Sd2#
- 2.f3#
- 1...Sh4
- 2.Sd2#
- 2.c3#
- 1...Bxc4!
- threat
- 1.Sd7?
- threat
- 2.Bd5#
- 2.c4#
- 1...Qxd4
- 2.Bd5#
- 2.Re5#
- 1...Rxc2
- 2.Sc5#
- 1...Rxa7
- 2.Sc5#
- 2.Bd5#
- 1...Rcxd7
- 2.c4#
- 1...Rdxd7
- 2.c4#
- 1...Sxd4
- 2.Bg6#
- 1...Sxf4
- 2.Sg5#
- 1...Qe5
- 2.Rxe5#
- 2.c4#
- 1...Qg8
- 2.Re5#
- 2.c4#
- 1...Rc3
- 2.Bd5#
- 1...Rc4
- 2.Bd5#
- 2.c3#
- 1...Rc5
- 2.Sxc5#
- 1...Bd3
- 2.Bd5#
- 2.cxd3#
- 1...Bb5
- 2.c4#
- 1...Bb7
- 2.c3#
- 2.c4#
- 1...Se3
- 2.f3#
- 1...Sfg3
- 2.c4#
- 1...Sh4
- 2.c4#
- 1...Sd6
- 2.c4#
- 1...Sh6
- 2.c4#
- 1...Se7
- 2.c4#
- 1...Sfg7
- 2.Re5#
- 2.c4#
- 1...Sf6
- 2.Re5#
- 2.c4#
- 1...Bc4!
- threat
- 1.Rc4?
- threat
- 2.c3#
- 1...Sxf4
- 2.Sg5#
- 1...Se3
- 2.f3#
- 1...Bxc4!
- threat
- 1.d5+?
- 1...Rc4
- 2.c3#
- 1...Bc4
- 2.c3#
- 1...Sd4
- 2.Bg6#
- 1...Qd4!
- 1...Rc4
- 1.Sc4?
- Keys
- 1.Sa4!
- threat
- 2.c4#
- 1...Qxd4
- 2.Re5#
- 1...Rxc2
- 2.Sc5#
- 1...Rxa7
- 2.Sc3#
- 2.Sc5#
- 1...Rxd4
- 2.Bd5#
- 1...Sxd4
- 2.Bg6#
- 1...Sxf4
- 2.Sg5#
- 1...Rc3
- 2.Sxc3#
- 1...Rc4
- 2.c3#
- 1...Rc5
- 2.Sxc5#
- 1...Bd3
- 2.cxd3#
- 1...Bc4
- 2.Sc3#
- 1...Se3
- 2.f3#
- threat
- 1.Sa4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 17
- Sets
- Q(i);N_GUARD,P_SPINQ(i),XP(H)::R1(J)
- Q(i);N_GUARD::R1(J),XQ(i)
- Q(i);N_GUARD::R1(J)
- R(g);S_CUTB(f)::QAB(A)+P(C)
- R(h);N_GUARD,P_SPINR(h),XP(H)::B(M)
- R(h);N_GUARD::B(M),XR(h)
- R(h);N_GUARD::B(M)
- B(f);OGATE::P(C),XB(f)
- B(f);N_GUARD::QAB(A)+P(C)
- S(d);SBLOCK::P(D)
- S(d);OGATEB,P_SPINS(d),XP(H)::B(M)
- S(d);S_CUTQ(i)::R1(J)
- S(e);SBLOCK,XP(I)::S(F)
- S(e);S_CUTQ(i)::R1(J)
- Tries
- Try
- S(K);
- Threat
- DUALS(3)
- Vars
- R(g);XS(K)::QAB(A)+P(C)
- S(d);XP(H)::S(K)
- Refutation
- B(f);XS(K)
- Try
- S(K);
- Threat
- DUALS(2)
- Vars
- R(g);N_GUARD,P_SPINR(g),XP(C)::S(K)
- R(g);XS(K)::QAB(A)+P(C)
- R(h);XS(K)::QAB(A)+P(C)
- S(d);OGATEB,P_SPINS(d),XP(H)::B(M)
- S(e);SBLOCK,XP(I)::S(F)
- R(g);::B(M)
- R(g);N_GUARD::S(K),XR(g)
- B(f);::QAB(A)+P(C)
- S(d);SBLOCK::P(D)
- S(d);::QAB(A)+P(C)
- Refutation
- B(f);
- Try
- R(G);
- Threat
- QAB(A)+P(C)
- Vars
- S(e);SBLOCK,XP(I)::S(F)
- S(d);SBLOCK::P(D)
- Refutation
- B(f);XR(G)
- Try
- P(H);CHECK
- Vars
- R(g);P_SPINR(g)::QAB(A)+P(C)
- B(f);P_SPINB(f)::QAB(A)+P(C)
- S(d);P_SPINS(d),S_CUTB(f),S_CUTQ(i),S_CUTR(g)::B(M)
- Refutation
- Q(i);P_SPINQ(i)
- Try
- Actual
- S(K);
- Threat
- QAB(A)+P(C)
- Vars
- Q(i);N_GUARD,P_SPINQ(i),XP(H)::R1(J)
- R(g);N_GUARD,P_SPINR(g),XP(C)::S(K)
- R(h);N_GUARD,P_SPINR(h),XP(H)::B(M)
- S(d);OGATEB,P_SPINS(d),XP(H)::B(M)
- S(e);SBLOCK,XP(I)::S(F)
- R(g);N_GUARD::S(K),XR(g)
- R(g);S_CUTB(f)::QAB(A)+P(C)
- B(f);OGATE::P(C),XB(f)
- B(f);S_CUTR(g)::S(K)
- S(d);SBLOCK::P(D)
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).