MESON Chess Problem Database
Problem Display
PID: 267206 (4N1n1/8/q3n1P1/P2p1b1B/3Pk1p1/6K1/3Q4/4N3 w - - 0 1)
Lewis, Robert Tony
The Problemist, 1955
#2
8 + 7
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Sd6#
- 1...Qe2
- 2.Sd6#
- 1...Qd3+
- 2.Qxd3#
- 1...Qc4
- 2.Sd6#
- 1...Qb5
- 2.Sd6#
- 1...Qb7
- 2.Sd6#
- 2.Qd3#
- 1...Qc8
- 2.Sd6#
- 2.Qd3#
- 1...Qxa5
- 2.Sd6#
- 2.Qd3#
- 1...Qb6
- 2.Qd3#
- 1...Qc6
- 2.Qd3#
- 1...Qd6+
- 2.Sxd6#
- 1...Qa7
- 2.Sd6#
- 2.Qd3#
- 1...Qa8
- 2.Sd6#
- 2.Qd3#
- 1...Bxg6
- 2.Bxg6#
- 1...Sxd4
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sc5
- 2.Qf4#
- 1...Sg5
- 2.Qf4#
- 1...Sc7
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sd8
- 2.Qf4#
- 1...Sf8
- 2.Qf4#
- 1...Sf6
- 2.Sxf6#
- 1...Sh6
- 2.Sf6#
- 1...Se7
- 2.Sf6#
- 1...Qf1
- Tries
- 1.Sc2?
- threat
- 2.Qe3#
- 1...Qd6+
- 2.Sxd6#
- 1...Bxg6
- 2.Bxg6#
- 1...Qe2
- 2.Sd6#
- 2.Qxe2#
- 1...Qd3+!
- threat
- 1.Sg2?
- threat
- 2.Qe3#
- 1...Qd6+
- 2.Sxd6#
- 1...Bxg6
- 2.Bxg6#
- 1...Qe2
- 2.Sd6#
- 1...Qd3+!
- threat
- 1.g7?
- 1...Qd3+
- 2.Qxd3#
- 1...Qd6+
- 2.Sxd6#
- 1...Qxa5
- 2.Sd6#
- 2.Qd3#
- 1...Sxd4
- 2.Qf4#
- 1...Sxg7
- 2.Qf4#
- 1...Bg6
- 2.Bxg6#
- 1...Qf1
- 2.Sd6#
- 1...Qe2
- 2.Sd6#
- 1...Qc4
- 2.Sd6#
- 1...Qb5
- 2.Sd6#
- 1...Qb7
- 2.Sd6#
- 2.Qd3#
- 1...Qc8
- 2.Sd6#
- 2.Qd3#
- 1...Qb6
- 2.Qd3#
- 1...Qc6
- 2.Qd3#
- 1...Qa7
- 2.Sd6#
- 2.Qd3#
- 1...Qa8
- 2.Sd6#
- 2.Qd3#
- 1...Sf4
- 2.Qxf4#
- 1...Sc5
- 2.Qf4#
- 1...Sg5
- 2.Qf4#
- 1...Sc7
- 2.Qf4#
- 1...Sd8
- 2.Qf4#
- 1...Sf8
- 2.Qf4#
- 1...Sf6
- 2.Sxf6#
- 1...Sh6
- 2.Sf6#
- 1...Se7
- 2.Sf6#
- 1...Bh7!
- 1...Qd3+
- 1.Sc2?
- Keys
- 1.Sf3!
- 1...Qd6+
- 2.Sxd6#
- 1...Qxa5
- 2.Sd6#
- 2.Qe2#
- 1...Bxg6
- 2.Bxg6#
- 1...Sxd4
- 2.Qxd4#
- 1...gxf3
- 2.Bxf3#
- 1...Qf1
- 2.Sd6#
- 1...Qe2
- 2.Sd6#
- 2.Qxe2#
- 1...Qd3
- 2.Sd6#
- 1...Qc4
- 2.Sd6#
- 1...Qb5
- 2.Sd6#
- 1...Qb7
- 2.Sd6#
- 2.Qe2#
- 1...Qc8
- 2.Sd6#
- 2.Qe2#
- 1...Qb6
- 2.Qe2#
- 1...Qc6
- 2.Qe2#
- 1...Qa7
- 2.Sd6#
- 2.Qe2#
- 1...Qa8
- 2.Sd6#
- 2.Qe2#
- 1...Sf4
- 2.Sg5#
- 1...Sc5
- 2.Sg5#
- 1...Sg5
- 2.Sxg5#
- 1...Sc7
- 2.Sg5#
- 1...Sg7
- 2.Sg5#
- 1...Sd8
- 2.Sg5#
- 1...Sf8
- 2.Sg5#
- 1...Sf6
- 2.Sxf6#
- 1...Sh6
- 2.Sf6#
- 1...Se7
- 2.Sf6#
- 1...Qd6+
- 1.Sf3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 11
- ADDED MATES = 1
- REMOVED MATES = 1
- Sets
- Q(e);N_GUARD::S(H)
- Q(e);CHECK,N_GUARD::QAB1(B),XQ(e)
- Q(e);N_GUARD::QAB1(B)
- Q(e);CHECK,N_GUARD::S(H),XQ(e)
- B(d);OGATE,XP(G)::B(F),XB(d)
- S(f);N_GUARD,SBLOCK,XP(D)::QAR1(B)
- S(f);N_GUARD::QAR1(B),XS(f)
- S(f);N_GUARD::QAR1(B)
- S(g);N_GUARD::S(H),XS(g)
- S(g);N_GUARD::S(H)
- Tries
- Try
- S(A);
- Threat
- QAR1(B)
- Vars
- Q(e);CHECK,N_GUARD::S(H),XQ(e)
- B(d);OGATE,XP(G)::B(F),XB(d)
- Refutation
- Q(e);CHECK
- Try
- S(A);
- Threat
- QAR1(B)
- Vars
- Q(e);CHECK,N_GUARD::S(H),XQ(e)
- B(d);OGATE,XP(G)::B(F),XB(d)
- Q(e);N_GUARD::S(H)
- Refutation
- Q(e);CHECK
- Try
- P(G);
- Vars
- Q(e);CHECK,N_GUARD::QAB1(B),XQ(e)
- Q(e);CHECK,N_GUARD::S(H),XQ(e)
- S(f);N_GUARD,SBLOCK,XP(D)::QAR1(B)
- S(f);N_GUARD,XP(G)::QAR1(B)
- B(d);OGATEB::B(F),XB(d)
- Q(e);N_GUARD::S(H)
- Q(e);N_GUARD::QAB1(B)
- S(f);N_GUARD::QAR1(B),XS(f)
- S(f);N_GUARD::QAR1(B)
- S(g);N_GUARD::S(H),XS(g)
- S(g);N_GUARD::S(H)
- Refutation
- B(d);
- Try
- Actual
- S(A);
- Vars
- Q(e);CHECK,N_GUARD::S(H),XQ(e)
- B(d);OGATE,XP(G)::B(F),XB(d)
- S(f);OGATE,XP(D)::QAR1(B),XS(f)
- P(b);OGATE,XS(A)::B(F),XP(b)
- Q(e);N_GUARD::S(H)
- Q(e);N_GUARD,P_PINS(A)::S(H)
- Q(e);N_GUARD::QAR2(B)
- S(f);N_GUARD::S(A)
- S(f);N_GUARD::S(A),XS(f)
- S(g);N_GUARD::S(H),XS(g)
- S(g);N_GUARD::S(H)
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).