MESON Chess Problem Database
Problem Display
PID: 11990 (8/3Nb3/1Np1P3/4P3/4k3/pQ3R2/K4n2/B4n2 w - - 0 1)
Lester, John Aldrich
The Problemist, 1973
#2
8 + 6
SOLUTION
- SOUND
- Sets
- 1...Bb4
- 2.Sf6#
- 1...Bh4
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 2.Sf6#
- 1...Bg5
- 2.Sc5#
- 1...Bd6
- 2.Sf6#
- 1...Bf6
- 2.Sc5#
- 2.Sxf6#
- 1...Bd8
- 2.Sc5#
- 1...Bf8
- 2.Sf6#
- 1...Sd2
- 2.Qe3#
- 1...Sh2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Sg3
- 2.Qe3#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sd3
- 2.Qxd3#
- 1...Sh3
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...c5
- 2.Qd5#
- 1...Bb4
- Tries
- 1.Sd5?
- threat
- 2.Rf4#
- 1...Sd3
- 2.Qxd3#
- 1...Bg5
- 2.Sc5#
- 1...Sh3
- 2.Qd3#
- 1...cxd5!
- threat
- 1.Bb2?
- 1...Se3
- 2.Qxe3#
- 1...Sd3
- 2.Qxd3#
- 1...Sd2
- 2.Qe3#
- 1...Bb4
- 2.Sf6#
- 1...Bh4
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 2.Sf6#
- 1...Bg5
- 2.Sc5#
- 1...Bd6
- 2.Sf6#
- 1...Bf6
- 2.Sc5#
- 2.Sxf6#
- 1...Bd8
- 2.Sc5#
- 1...Bf8
- 2.Sf6#
- 1...Sh2
- 2.Qe3#
- 1...Sg3
- 2.Qe3#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sh3
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...c5
- 2.Qd5#
- 1...axb2!
- 1...Se3
- 1.Qc2+?
- 1...Sd3
- 2.Qxd3#
- 2.Qxc6#
- 1...Kxf3!
- 1...Sd3
- 1.Qa4+?
- 1...Bb4
- 2.Qxc6#
- 1...Kxf3!
- 1...Bb4
- 1.Qb1+?
- 1...Sd3
- 2.Qxd3#
- 1...Kxf3!
- 1...Sd3
- 1.Qxa3?
- 1...Se3
- 2.Qxe3#
- 1...Sd3
- 2.Qxd3#
- 1...Sd2
- 2.Qe3#
- 1...Bb4
- 2.Sf6#
- 1...Bh4
- 2.Sc5#
- 1...Bc5
- 2.Sxc5#
- 2.Sf6#
- 1...Bg5
- 2.Sc5#
- 1...Bd6
- 2.Sf6#
- 1...Bf6
- 2.Sc5#
- 2.Sxf6#
- 1...Bd8
- 2.Sc5#
- 1...Bf8
- 2.Sf6#
- 1...Sh2
- 2.Qe3#
- 1...Sg3
- 2.Qe3#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sh3
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...c5
- 2.Qa8#
- 1...Bxa3!
- 1...Se3
- 1.Qc3?
- threat
- 2.Qxc6#
- 1...Se3
- 2.Qxe3#
- 1...Bc5
- 2.Sxc5#
- 2.Sf6#
- 1...c5!
- threat
- 1.Sd5?
- Keys
- 1.Sc4!
- 1...Kd5
- 2.Sd2#
- 2.Sd6#
- 1...Se3
- 2.Sd2#
- 1...Sd3
- 2.Qxd3#
- 1...Bb4
- 2.Sf6#
- 1...Bh4
- 2.Sd6#
- 1...Bc5
- 2.Sf6#
- 1...Bg5
- 2.Sd6#
- 1...Bd6
- 2.Sxd6#
- 2.Sf6#
- 1...Bf6
- 2.Sd6#
- 2.Sxf6#
- 1...Bd8
- 2.Sd6#
- 1...Bf8
- 2.Sf6#
- 1...Sd2
- 2.Sxd2#
- 1...Sh2
- 2.Sd2#
- 1...Sg3
- 2.Sd2#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sh3
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...c5
- 2.Qb7#
- 1...Kd5
- 1.Sc4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 1
- REMOVED MATES = 1
- Sets
- B(f);N_GUARD::S(H)
- S(a);N_GUARD::QAR1(C)
- S(a);N_GUARD::QAR1(C),XS(a)
- S(b);N_GUARD::QAB1(C)
- S(b);N_GUARD::QAB1(C),XS(b)
- P(e);N_GUARD::QAB1(C)
- Tries
- Try
- S(F);
- Threat
- R1(D)
- Vars
- S(b);N_GUARD::QAB1(C),XS(b)
- B(f);N_GUARD::S(H)
- S(b);N_GUARD::QAB1(C)
- Refutation
- P(e);XS(F)
- Try
- B(A);
- Vars
- S(a);N_GUARD::QAR1(C),XS(a)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(a);N_GUARD::QAR1(C)
- B(f);N_GUARD::S(H)
- S(b);N_GUARD::QAB1(C)
- P(e);N_GUARD::QAB1(C)
- Refutation
- P(c);XB(A)
- Try
- Q(C);CHECK
- Refutation
- K(d);S_FLIGHT,XR(D)
- Try
- Q(C);CHECK
- Vars
- B(f);P_SPINB(f)::QAB(C),XP(e)
- Refutation
- K(d);S_FLIGHT,XR(D)
- Try
- Q(C);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::QAB1(C),XS(b)
- Refutation
- K(d);S_FLIGHT,XR(D)
- Try
- Q(C);XP(c)
- Vars
- S(a);N_GUARD::QAR1(C),XS(a)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(a);N_GUARD::QAR1(C)
- B(f);N_GUARD::S(H)
- S(b);N_GUARD::QAB1(C)
- P(e);OGATEB::QAB(C)
- Refutation
- B(f);XQ(C)
- Try
- Q(C);
- Threat
- QAB(C),XP(e)
- Vars
- S(a);N_GUARD::QAR1(C),XS(a)
- Refutation
- P(e);
- Try
- Actual
- S(F);
- Vars
- S(a);N_GUARD::S(F)
- S(b);N_GUARD::QAB1(C),XS(b)
- B(f);N_GUARD::S(H)
- B(f);N_GUARD::S(F)
- S(a);N_GUARD::S(F),XS(a)
- S(b);N_GUARD::QAB1(C)
- P(e);OGATEB::QAB(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).