MESON Chess Problem Database
Problem Display
PID: 465 (8/3KP1P1/1B1p1R2/3kpn2/3pp3/6q1/NNn1r1P1/5BQ1 w - - 0 1)
Krawiec, J
The Observer, 1956
#2
10 + 9
SOLUTION
- SOUND
- Sets
- 1...Qe1
- 2.g8Q#
- 2.g8B#
- 1...Qf2
- 2.g8Q#
- 2.g8B#
- 1...Qh2
- 2.g8Q#
- 2.g8B#
- 1...Qf4
- 2.g8Q#
- 2.g8B#
- 1...Qh4
- 2.g8Q#
- 2.g8B#
- 1...Qa3
- 2.g8Q#
- 2.g8B#
- 1...Qb3
- 2.g8Q#
- 2.g8B#
- 1...Qc3
- 2.g8Q#
- 2.g8B#
- 1...Qd3
- 2.g8Q#
- 2.g8B#
- 1...Qe3
- 2.g8Q#
- 2.g8B#
- 1...Qf3
- 2.g8Q#
- 2.g8B#
- 1...Qh3
- 2.g8Q#
- 2.g8B#
- 1...Re1
- 2.Bc4#
- 1...Rd2
- 2.Bc4#
- 1...Rf2
- 2.Bc4#
- 1...Rxg2
- 2.Bc4#
- 1...Re3
- 2.Bc4#
- 1...Sa1
- 2.Sb4#
- 1...Se1
- 2.Sb4#
- 1...Sa3
- 2.Sb4#
- 1...Sce3
- 2.Sb4#
- 1...Sb4
- 2.Sxb4#
- 1...Sfe3
- 2.Rxd6#
- 1...Sh4
- 2.Rxd6#
- 1...Sh6
- 2.Rxd6#
- 1...Sxe7
- 2.Rxd6#
- 1...Sxg7
- 2.Rxd6#
- 1...d3
- 2.Sc3#
- 1...Qe1
- Tries
- 1.Sc3+?
- 1...Qxc3
- 2.g8Q#
- 2.g8B#
- 1...dxc3!
- 1...Qxc3
- 1.Bxe2?
- threat
- 2.Bc4#
- 1...Qb3
- 2.g8Q#
- 2.g8B#
- 1...Qc3
- 2.g8Q#
- 2.g8B#
- 1...Qd3
- 2.g8Q#
- 2.g8B#
- 1...Sa3
- 2.Sb4#
- 1...Sce3
- 2.Sb4#
- 1...Sfe3
- 2.Rxd6#
- 1...d3
- 2.Sc3#
- 1...e3!
- threat
- 1.Qxd4+?
- 1...Scxd4
- 2.Sb4#
- 1...Sfxd4
- 2.Rxd6#
- 1...exd4!
- 1...Scxd4
- 1.e8Q?
- threat
- 2.Qf7#
- 2.Qe6#
- 2.Qa8#
- 2.Qg8#
- 1...Sxg7
- 2.Rxd6#
- 2.Qa8#
- 1...e3
- 2.Qa8#
- 1...Qa3
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 2.g8Q#
- 2.g8B#
- 1...Qc3
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 2.g8Q#
- 2.g8B#
- 1...Qg6
- 2.Qe6#
- 2.Qa8#
- 1...Sb4
- 2.Sxb4#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Sh6
- 2.Rxd6#
- 2.Qe6#
- 2.Qa8#
- 1...Se7
- 2.Rxd6#
- 2.Qf7#
- 1...Qxg7+!
- threat
- 1.Sc3+?
- Keys
- 1.Qe3!
- 1...Qxg2
- 2.Qb3#
- 1...Qxe3
- 2.g8Q#
- 2.g8B#
- 1...Qxg7
- 2.Qb3#
- 1...Rxg2
- 2.Bc4#
- 1...Rxe3
- 2.Bc4#
- 1...Scxe3
- 2.Sb4#
- 1...Sfxe3
- 2.Rxd6#
- 1...Sxe7
- 2.Rxd6#
- 1...Sxg7
- 2.Rxd6#
- 1...dxe3
- 2.Sc3#
- 1...Qe1
- 2.Qb3#
- 2.g8Q#
- 2.g8B#
- 1...Qf2
- 2.Qb3#
- 2.g8Q#
- 2.g8B#
- 1...Qh2
- 2.Qb3#
- 2.g8Q#
- 2.g8B#
- 1...Qf4
- 2.Qb3#
- 2.g8Q#
- 2.g8B#
- 1...Qh4
- 2.Qb3#
- 2.g8Q#
- 2.g8B#
- 1...Qf3
- 2.g8Q#
- 2.g8B#
- 1...Qh3
- 2.g8Q#
- 2.g8B#
- 1...Qg4
- 2.Qb3#
- 1...Qg5
- 2.Qb3#
- 1...Qg6
- 2.Qb3#
- 1...Re1
- 2.Bc4#
- 1...Rd2
- 2.Bc4#
- 1...Rf2
- 2.Bc4#
- 1...Sa1
- 2.Sb4#
- 1...Se1
- 2.Sb4#
- 1...Sa3
- 2.Sb4#
- 1...Sb4
- 2.Sxb4#
- 1...Sh4
- 2.Rxd6#
- 1...Sh6
- 2.Rxd6#
- 1...d3
- 2.Sc3#
- 1...Qxg2
- 1.Qe3!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 0
- Sets
- Q(c);N_GUARD::P=Q
- R(b);OGATE::B(A)
- R(b);OGATE,XP(E)::B(A)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- S(h);N_GUARD::R1(G),XP(i)
- S(h);N_GUARD,XP(I)::R1(G),XP(i)
- S(h);N_GUARD,XP(J)::R1(G),XP(i)
- P(d);N_GUARD,S_CUTQ(c)::S(C)
- Tries
- Try
- S(C);CHECK
- Vars
- Q(c);XS(C)::P=Q
- Refutation
- P(d);XS(C)
- Try
- B(A);XR(b)
- Threat
- B(A)
- Vars
- Q(c);N_GUARD::P=Q
- S(a);N_GUARD::S(C)
- S(h);N_GUARD::R1(G),XP(i)
- P(d);N_GUARD,S_CUTQ(c)::S(C)
- Refutation
- P(e);
- Try
- Q(B);CHECK,XP(d)
- Vars
- S(a);XQ(B)::S(C)
- S(h);XQ(B)::R1(G),XP(i)
- Refutation
- P(g);XQ(B)
- Try
- P(I);
- Threat
- DUALS(4)
- Vars
- P(e);::QAB(I)
- Refutation
- Q(c);CHECK,XP(J)
- Try
- Actual
- Q(B);
- Vars
- Q(c);N_GUARD,XP(E)::QAB(B)
- Q(c);N_GUARD,XQ(B)::P=Q
- Q(c);N_GUARD,P_PINP(I),XP(J)::QAB(B)
- R(b);OGATE,XP(E)::B(A)
- R(b);OGATE,XQ(B)::B(A)
- S(a);N_GUARD,XQ(B)::S(C)
- S(h);N_GUARD,XQ(B)::R1(G),XP(i)
- S(h);N_GUARD,XP(I)::R1(G),XP(i)
- S(h);N_GUARD,XP(J)::R1(G),XP(i)
- P(d);N_GUARD,XQ(B)::S(C)
- Q(c);N_GUARD::P=Q
- Q(c);N_GUARD::QAB(B)
- R(b);OGATE::B(A)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- S(h);N_GUARD::R1(G),XP(i)
- P(d);N_GUARD::S(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).