MESON Chess Problem Database
Problem Display
PID: 271994 (2b3B1/b7/4nK2/p3ppp1/2P1kpN1/3N1n1R/1Qp1P3/3r2B1 w - - 0 1)
Driver, John Edward
The Problemist, 1957
#2
9 + 12
SOLUTION
- SOUND
- Sets
- 1...Bf2
- 2.Sdxf2#
- 1...Bb8
- 2.Sdf2#
- 1...Bb7
- 2.Qxb7#
- 1...Se1
- 2.Qxe5#
- 1...Sxg1
- 2.Qxe5#
- 1...Sd2
- 2.Qxe5#
- 1...Sh2
- 2.Qxe5#
- 1...Sfd4
- 2.Sdf2#
- 2.Sgf2#
- 1...Sh4
- 2.Qxe5#
- 1...Sed4
- 2.Sdf2#
- 2.Bd5#
- 1...Sc5
- 2.Sdf2#
- 2.Bd5#
- 1...Sg7
- 2.Bd5#
- 1...Sd8
- 2.Bd5#
- 1...Sf8
- 2.Bd5#
- 1...fxg4
- 2.Bh7#
- 1...Bf2
- Tries
- 1.Sc1?
- threat
- 2.exf3#
- 1...Sxg1
- 2.Qxe5#
- 1...fxg4
- 2.Bh7#
- 1...Rf1
- 2.Qxc2#
- 1...Rd3
- 2.exd3#
- 1...Se1
- 2.Qxe5#
- 1...Sd2
- 2.Qxe5#
- 2.Qxc2#
- 1...Sh2
- 2.Qxe5#
- 1...Sfd4
- 2.Sf2#
- 1...Sh4
- 2.Qxe5#
- 1...Sed4
- 2.Bd5#
- 1...Rxc1!
- threat
- 1.Sb4?
- threat
- 2.exf3#
- 1...Sxg1
- 2.Qxe5#
- 1...fxg4
- 2.Bh7#
- 1...Rf1
- 2.Qxc2#
- 1...Rd3
- 2.exd3#
- 1...Se1
- 2.Qxe5#
- 1...Sd2
- 2.Qxe5#
- 2.Qxc2#
- 1...Sh2
- 2.Qxe5#
- 1...Sfd4
- 2.Sf2#
- 1...Sh4
- 2.Qxe5#
- 1...Sed4
- 2.Bd5#
- 1...axb4!
- threat
- 1.Bxa7?
- threat
- 2.Sdf2#
- 2.Sgf2#
- 1...Rxd3
- 2.Sf2#
- 1...fxg4
- 2.Sf2#
- 2.Bh7#
- 1...Sed4
- 2.Sdf2#
- 2.Sc5#
- 2.Bd5#
- 1...Sc5
- 2.Sdf2#
- 2.Sxc5#
- 2.Bd5#
- 1...Rf1!
- threat
- 1.Rxf3?
- threat
- 2.Qxe5#
- 1...Bb8
- 2.Sdf2#
- 2.Sgf2#
- 1...Sd4
- 2.Sdf2#
- 2.Sgf2#
- 2.Bd5#
- 1...Bd4!
- threat
- 1.Qc3?
- threat
- 2.exf3#
- 1...Rxd3
- 2.Qxd3#
- 2.exd3#
- 1...Sxg1
- 2.Qxe5#
- 1...fxg4
- 2.Bh7#
- 1...Se1
- 2.Qxe5#
- 1...Sd2
- 2.Qxe5#
- 1...Sh2
- 2.Qxe5#
- 1...Sfd4
- 2.Sdf2#
- 2.Sgf2#
- 1...Sh4
- 2.Qxe5#
- 1...Sed4
- 2.Sdf2#
- 2.Bd5#
- 1...Rf1!
- threat
- 1.Qd4+?
- 1...Sfxd4
- 2.Sdf2#
- 2.Sgf2#
- 1...Sexd4
- 2.Sdf2#
- 2.Bd5#
- 1...exd4
- 2.Sdf2#
- 1...Bxd4!
- 1...Sfxd4
- 1.Qb6?
- threat
- 2.Sdf2#
- 2.Sgf2#
- 2.Qc6#
- 1...Rxg1
- 2.Sdf2#
- 2.Sgf2#
- 1...Rxd3
- 2.Sf2#
- 1...Sxg1
- 2.Sdf2#
- 2.Sgf2#
- 1...fxg4
- 2.Sf2#
- 2.Bh7#
- 2.Qc6#
- 1...Rf1
- 2.Qc6#
- 1...Bb7
- 2.Sdf2#
- 2.Sgf2#
- 2.Qxb7#
- 1...Bd7
- 2.Sdf2#
- 2.Sgf2#
- 1...Sfd4
- 2.Sdf2#
- 2.Sgf2#
- 1...Sed4
- 2.Sdf2#
- 2.Sc5#
- 2.Bd5#
- 1...Sc5
- 2.Sxc5#
- 2.Bd5#
- 2.Qc6#
- 1...Sc7
- 2.Sdf2#
- 2.Sc5#
- 2.Sgf2#
- 1...Sd8
- 2.Sdf2#
- 2.Sc5#
- 2.Sgf2#
- 2.Bd5#
- 1...Bxb6!
- threat
- 1.Sc1?
- Keys
- 1.Se1!
- threat
- 2.exf3#
- 1...Rxe1
- 2.Qxc2#
- 1...Sxe1
- 2.Qxe5#
- 1...Sxg1
- 2.Qxe5#
- 1...fxg4
- 2.Bh7#
- 1...Rd3
- 2.exd3#
- 1...Sd2
- 2.Qxe5#
- 2.Qxc2#
- 1...Sh2
- 2.Qxe5#
- 1...Sfd4
- 2.Sf2#
- 1...Sh4
- 2.Qxe5#
- 1...Sed4
- 2.Bd5#
- threat
- 1.Se1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 7
- Sets
- B(k);N_GUARD::S(D),XB(k)
- B(k);N_GUARD::S(D)
- B(l);N_GUARD::QAB(B),XB(l)
- S(c);N_GUARD::QAR1(B),XP(g)
- S(c);N_GUARD,XB(A)::QAR1(B),XP(g)
- S(j);OGATE::B(I)
- P(h);OGATEB,XS(G)::B(I)
- Tries
- Try
- S(D);
- Threat
- P(C),XS(c)
- Vars
- S(c);N_GUARD,XB(A)::QAR1(B),XP(g)
- P(h);OGATEB,XS(G)::B(I)
- R(a);N_GUARD::QAB(B),XP(b)
- R(a);OGATE::P(C),XR(a)
- S(c);N_GUARD::QAR1(B),XP(g)
- S(c);S_CUTB(k)::S(G)
- S(j);OGATE::B(I)
- Refutation
- R(a);XS(D)
- Try
- S(D);
- Threat
- P(C),XS(c)
- Vars
- S(c);N_GUARD,XB(A)::QAR1(B),XP(g)
- P(h);OGATEB,XS(G)::B(I)
- R(a);N_GUARD::QAB(B),XP(b)
- R(a);OGATE::P(C),XR(a)
- S(c);N_GUARD::QAR1(B),XP(g)
- S(c);S_CUTB(k)::S(G)
- S(j);OGATE::B(I)
- Refutation
- P(f);XS(D)
- Try
- B(A);XB(k)
- Threat
- DUALS(2)
- Vars
- R(a);XS(D)::S(G)
- Refutation
- R(a);
- Try
- R(E);XS(c)
- Threat
- QAR1(B),XP(g)
- Refutation
- B(k);
- Try
- Q(B);
- Threat
- P(C),XS(c)
- Vars
- S(c);N_GUARD,XB(A)::QAR1(B),XP(g)
- P(h);OGATEB,XS(G)::B(I)
- S(c);N_GUARD::QAR1(B),XP(g)
- Refutation
- R(a);
- Try
- Q(B);CHECK
- Vars
- P(g);SBLOCK,XQ(B)::S(D)
- Refutation
- B(k);XQ(B)
- Try
- Q(B);
- Threat
- DUALS(3)
- Vars
- R(a);XS(D)::S(G)
- R(a);::QAB(B)
- Refutation
- B(k);XQ(B)
- Try
- Actual
- S(D);
- Threat
- P(C),XS(c)
- Vars
- R(a);N_GUARD,XS(D)::QAB(B),XP(b)
- S(c);N_GUARD,XS(D)::QAR1(B),XP(g)
- S(c);N_GUARD,XB(A)::QAR1(B),XP(g)
- P(h);OGATEB,XS(G)::B(I)
- R(a);OGATE::P(C),XR(a)
- S(c);N_GUARD::QAR1(B),XP(g)
- S(c);S_CUTB(k)::S(G)
- S(j);OGATE::B(I)
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).