MESON Chess Problem Database
Problem Display
PID: 249973 (3r4/1b1R1B2/2N2R1p/q3B2n/p1ppkP2/2P1PN2/KQ2PP2/2b3r1 w - - 0 1)
Jonsson, Nils Gustav Helmer
Stella Polaris, 1969
#2
13 + 11
SOLUTION
- SOUND
- Sets
- 1...Qxc3
- 2.Bd5#
- 1...Qb4
- 2.Bd5#
- 1...Qb6
- 2.Bd5#
- 1...Qc7
- 2.Bd5#
- 1...Qd5
- 2.Bxd5#
- 1...Qa6
- 2.Bd5#
- 1...Qa7
- 2.Bd5#
- 1...Qa8
- 2.Bd5#
- 1...Rd1
- 2.Bg6#
- 1...Re1
- 2.Bg6#
- 1...Rf1
- 2.Bg6#
- 1...Rh1
- 2.Bg6#
- 1...Rg6
- 2.Bxg6#
- 1...Ra8
- 2.Rxd4#
- 1...Rb8
- 2.Rxd4#
- 1...Rc8
- 2.Rxd4#
- 1...Re8
- 2.Rxd4#
- 1...Rf8
- 2.Rxd4#
- 1...Rg8
- 2.Rxd4#
- 1...Rh8
- 2.Rxd4#
- 1...Bxb2
- 2.Sd2#
- 1...Bd2
- 2.Sxd2#
- 1...Sxf4
- 2.Rxf4#
- 1...dxc3
- 2.Qc2#
- 1...dxe3
- 2.Qb1#
- 2.Qc2#
- 1...Qxc3
- Tries
- 1.Sfxd4?
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Qxc3
- 2.Bd5#
- 1...Bxe3
- 2.Qc2#
- 2.f3#
- 1...Sxf4
- 2.Rxf4#
- 1...Qb4
- 2.Bd5#
- 2.Qc2#
- 1...Qb6
- 2.Bd5#
- 2.Qc2#
- 1...Qb5
- 2.Qc2#
- 1...Rd1
- 2.Bg6#
- 1...Bd2
- 2.Qc2#
- 1...Bxb2!
- threat
- 1.Sg5+?
- 1...hxg5
- 2.Bg6#
- 1...Rxg5!
- 1...hxg5
- 1.Bxd4?
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Qxc3
- 2.Bd5#
- 2.Re7#
- 1...Bxb2
- 2.Sd2#
- 1...Bxe3
- 2.Qc2#
- 1...Sxf4
- 2.Rxf4#
- 1...Qb4
- 2.Bd5#
- 2.Qc2#
- 1...Qb6
- 2.Bd5#
- 2.Re7#
- 2.Qc2#
- 1...Qb5
- 2.Qc2#
- 1...Bd2
- 2.Sxd2#
- 2.Qc2#
- 1...Rd1!
- threat
- 1.Qxc1?
- threat
- 2.Sd2#
- 1...Qxc3
- 2.Bd5#
- 1...dxc3
- 2.Qc2#
- 1...dxe3
- 2.Qxe3#
- 2.Qc2#
- 1...Rd1
- 2.Bg6#
- 1...Sxf6!
- threat
- 1.cxd4?
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Bxe3
- 2.Qc2#
- 1...Sxf4
- 2.Rxf4#
- 1...Qd2
- 2.Bd5#
- 1...Qc3
- 2.Bd5#
- 1...Qb4
- 2.Bd5#
- 2.Qc2#
- 1...Qb6
- 2.Bd5#
- 2.Qc2#
- 1...Qb5
- 2.Qc2#
- 1...Rd1
- 2.Bg6#
- 1...Bd2
- 2.Qc2#
- 1...c3
- 2.Qc2#
- 1...Bxb2!
- threat
- 1.exd4?
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Qxc3
- 2.Bd5#
- 1...Bxb2
- 2.Sd2#
- 1...Bxf4
- 2.Qc2#
- 1...Qb4
- 2.Bd5#
- 2.Qc2#
- 1...Qb6
- 2.Bd5#
- 2.Qc2#
- 1...Qb5
- 2.Qc2#
- 1...Rd1
- 2.Bg6#
- 1...Bd2
- 2.Sxd2#
- 2.Qc2#
- 1...Be3
- 2.Qc2#
- 1...Sxf4!
- threat
- 1.Sfxd4?
- Keys
- 1.Scxd4!
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Qxc3
- 2.Qxb7#
- 1...Bxb2
- 2.Sd2#
- 1...Bxe3
- 2.Qc2#
- 1...Sxf4
- 2.Rxf4#
- 1...Qb4
- 2.Qc2#
- 1...Qb6
- 2.Qc2#
- 1...Qb5
- 2.Qc2#
- 1...Rd1
- 2.Bg6#
- 1...Bd2
- 2.Sxd2#
- 2.Qc2#
- threat
- 1.Scxd4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 2
- REMOVED MATES = 18
- Sets
- Q(g);N_GUARD,XP(E)::B(M)
- Q(g);N_GUARD::B(M)
- Q(g);N_GUARD::B(M),XQ(g)
- R(b);N_GUARD::B(M)
- R(b);N_GUARD::B(M),XR(b)
- R(k);N_GUARD::R1(L),XP(e)
- B(a);N_GUARD,XQ(B)::S(G)
- B(a);N_GUARD::S(G),XB(a)
- S(h);OGATE,XP(H)::R1(K),XS(h)
- P(e);N_GUARD,XP(E)::QAB(B)
- Tries
- Try
- S(G);XP(e)
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XP(E)::B(M)
- S(h);OGATE,XP(H)::R1(K),XS(h)
- Q(g);::QAB(B)
- R(b);N_GUARD::B(M)
- B(a);::QAB(B)
- Refutation
- B(a);XQ(B)
- Try
- S(G);CHECK
- Vars
- P(i);XS(G)::B(M)
- Refutation
- R(b);XS(G)
- Try
- B(I);XP(e)
- Threat
- DUALS(2)
- Vars
- B(a);N_GUARD,XQ(B)::S(G)
- B(a);XP(F)::QAB(B)
- S(h);OGATE,XP(H)::R1(K),XS(h)
- Q(g);::QAB(B)
- Refutation
- R(b);
- Try
- Q(B);XB(a)
- Threat
- S(G)
- Vars
- Q(g);N_GUARD,XP(E)::B(M)
- P(e);N_GUARD,XP(E)::QAB(B)
- R(b);N_GUARD::B(M)
- Refutation
- S(h);XR(K)
- Try
- P(E);XP(e)
- Threat
- DUALS(2)
- Vars
- B(a);XP(F)::QAB(B)
- S(h);OGATE,XP(H)::R1(K),XS(h)
- Q(g);N_GUARD,P_PINQ(B)::B(M)
- Q(g);N_GUARD::B(M)
- Q(g);::QAB(B)
- R(b);N_GUARD::B(M)
- B(a);::QAB(B)
- P(d);::QAB(B)
- Refutation
- B(a);XQ(B)
- Try
- P(F);XP(e)
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XP(E)::B(M)
- B(a);N_GUARD,XQ(B)::S(G)
- B(a);XP(H)::QAB(B)
- Q(g);::QAB(B)
- R(b);N_GUARD::B(M)
- B(a);::QAB(B)
- Refutation
- S(h);XP(H)
- Try
- Actual
- S(J);XP(e)
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XP(E)::QAB(B),XB(j)
- B(a);N_GUARD,XQ(B)::S(G)
- B(a);XP(F)::QAB(B)
- S(h);OGATE,XP(H)::R1(K),XS(h)
- Q(g);::QAB(B)
- R(b);N_GUARD::B(M)
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).