MESON Chess Problem Database
Problem Display
PID: 27515 (4qkBN/3Pb2K/3Q3P/8/8/8/8/8 w - - 0 1)
Lebeck, Donald
Mate in Two!! (Lebeck), 1992
#2
6 + 3
SOLUTION
- SOUND
- Sets
- 1...Qg6+
- 2.Sxg6#
- 1...Qa8
- 2.Sg6#
- 1...Qb8
- 2.Sg6#
- 1...Qc8
- 2.Sg6#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qd8
- 2.Sg6#
- 1...Qg6+
- Tries
- 1.Qf4+?
- 1...Qf7+
- 2.Qxf7#
- 1...Bf6!
- 1...Qf7+
- 1.Qb8?
- threat
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Qxb8
- 2.Sg6#
- 1...Ba3
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bb4
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bh4
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bc5
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bg5
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd6
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bf6
- 2.Sg6#
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Qc8
- 2.Sg6#
- 1...Qd8
- 2.Sg6#
- 1...Bd8!
- threat
- 1.Qe6?
- 1...Qg6+
- 2.Sxg6#
- 1...Qf7+
- 2.Qxf7#
- 1...Qxd7
- 2.Qf7#
- 1...Qa8
- 2.Sg6#
- 2.Qf7#
- 1...Qb8
- 2.Sg6#
- 2.Qf7#
- 1...Qc8
- 2.Sg6#
- 2.Qf7#
- 1...Qd8
- 2.Sg6#
- 2.Qf7#
- 1...Ba3
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bb4
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bh4
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bc5
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bg5
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd6
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bf6
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd8
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Qh5!
- 1...Qg6+
- 1.Qf6+?
- 1...Qf7+
- 2.Qxf7#
- 1...Bxf6!
- 1...Qf7+
- 1.d8Q?
- threat
- 2.Sg6#
- 2.Q6xe7#
- 1...Bxd6
- 2.Sg6#
- 1...Qxd8!
- threat
- 1.Qf4+?
- Keys
- 1.Qg6!
- threat
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Qxg6+
- 2.Sxg6#
- 1...Qf7+
- 2.Qxf7#
- 1...Qxd7
- 2.Qf7#
- 1...Ba3
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bb4
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bh4
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bc5
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bg5
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd6
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bf6
- 2.Qxe8#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd8
- 2.Qxe8#
- 2.Qg7#
- 2.dxe8Q#
- 2.dxe8R#
- 1...Qa8
- 2.Qf7#
- 2.Qg7#
- 1...Qb8
- 2.Qf7#
- 2.Qg7#
- 1...Qc8
- 2.Qf7#
- 2.Qg7#
- 1...Qd8
- 2.Qf7#
- 2.Qg7#
- threat
- 1.Qg6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 3
- Sets
- Q(b);CHECK,N_GUARD::S(F),XQ(b)
- Q(b);N_GUARD::S(F)
- Tries
- Try
- Q(A);CHECK,N_PINB(a)
- Vars
- Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAR1(A),XQ(b)
- Refutation
- B(a);P_SPINB(a)
- Try
- Q(A);N_PINB(a),P_PINQ(b)
- Threat
- DUALS(4)
- Vars
- Q(b);N_SPINQ(b),XQ(A)::S(F)
- Q(b);::S(F)
- Refutation
- B(a);N_SPINQ(b)
- Try
- Q(A);N_PINB(a)
- Vars
- Q(b);CHECK,N_GUARD::S(F),XQ(b)
- Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
- Q(b);N_GUARD,XP(C)::QAR1(A)
- Refutation
- Q(b);P_PINP(B)
- Try
- Q(A);CHECK,N_PINB(a)
- Vars
- Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAR1(A),XQ(b)
- Refutation
- B(a);XQ(A)
- Try
- P(C);P_PINQ(b)
- Threat
- DUALS(2)
- Vars
- B(a);N_SPINB(a),XQ(A)::S(F)
- Refutation
- Q(b);N_SPINQ(b),XQ(C)
- Try
- Actual
- Q(A);N_PINB(a)
- Threat
- DUALS(4)
- Vars
- Q(b);CHECK,XQ(A)::S(F),XQ(b)
- Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
- Q(b);N_GUARD,XP(C)::QAR1(A)
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).