MESON Chess Problem Database
Problem Display
PID: 72288 (8/3K1p2/1p1n1P2/1B1kp2Q/1P1p4/8/p4N2/B7 w - - 0 1)
Larsson, Lennart
Chess, 1953
#2
7 + 7
SOLUTION
- SOUND
- Sets
- 1...Sc4
- 2.Bc6#
- 2.Qxf7#
- 1...Se4
- 2.Qxf7#
- 1...Sxb5
- 2.Qxf7#
- 1...Sf5
- 2.Qxf7#
- 1...Sb7
- 2.Qxf7#
- 1...Sc8
- 2.Qxf7#
- 1...Se8
- 2.Qxf7#
- 1...d3
- 2.Qxe5#
- 1...Sc4
- Tries
- 1.Bd3?
- 1...Sc4
- 2.Be4#
- 2.Qxf7#
- 1...Se4
- 2.Qxf7#
- 1...Sb5
- 2.Qxf7#
- 1...Sf5
- 2.Qxf7#
- 1...Sb7
- 2.Qxf7#
- 1...Sc8
- 2.Qxf7#
- 1...Se8
- 2.Qxf7#
- 1...b5!
- 1...Sc4
- 1.Bc4+?
- 1...Sxc4
- 2.Qxf7#
- 1...Kxc4!
- 1...Sxc4
- 1.Ba6?
- 1...Sb5
- 2.Qxf7#
- 1...Sc4
- 2.Bb7#
- 2.Qxf7#
- 1...Se4
- 2.Qxf7#
- 1...Sf5
- 2.Qxf7#
- 1...Sb7
- 2.Qxf7#
- 1...Sc8
- 2.Qxf7#
- 1...Se8
- 2.Qxf7#
- 1...d3
- 2.Qxe5#
- 1...b5!
- 1...Sb5
- 1.Qe2?
- threat
- 2.Bc6#
- 1...Sxb5
- 2.Qxb5#
- 2.Qxa2#
- 1...d3
- 2.Qxd3#
- 2.Qxe5#
- 1...e4!
- threat
- 1.Qf3+?
- 1...Se4
- 2.Qxe4#
- 2.Qb3#
- 1...e4!
- 1...Se4
- 1.Qh1+?
- 1...Se4
- 2.Qxe4#
- 1...e4!
- 1...Se4
- 1.Qh3?
- 1...Sxb5
- 2.Qb3#
- 1...Sc4
- 2.Bc6#
- 1...Se4
- 2.Qb3#
- 1...Sf5
- 2.Qb3#
- 1...Sb7
- 2.Qb3#
- 1...Sc8
- 2.Qb3#
- 1...Se8
- 2.Qb3#
- 1...d3
- 2.Qxd3#
- 1...e4!
- 1...Sxb5
- 1.Qh7?
- 1...Sxb5
- 2.Qxf7#
- 1...Sc4
- 2.Bc6#
- 2.Qe4#
- 2.Qxf7#
- 1...Se4
- 2.Qxe4#
- 2.Qxf7#
- 1...Sf5
- 2.Qxf7#
- 1...Sb7
- 2.Qe4#
- 2.Qxf7#
- 1...Sc8
- 2.Qe4#
- 2.Qxf7#
- 1...Se8
- 2.Qe4#
- 2.Qxf7#
- 1...d3
- 2.Qxd3#
- 1...e4!
- 1...Sxb5
- 1.Bd3?
- Keys
- 1.Qd1!
- 1...Sxb5
- 2.Qb3#
- 1...e4
- 2.Qxd4#
- 1...Sc4
- 2.Bc6#
- 1...Se4
- 2.Qb3#
- 1...Sf5
- 2.Qb3#
- 1...Sb7
- 2.Qb3#
- 1...Sc8
- 2.Qb3#
- 1...Se8
- 2.Qb3#
- 1...d3
- 2.Qxd3#
- 1...Sxb5
- 1.Qd1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 7
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- S(f);N_GUARD::QAB(E),XP(g)
- S(f);N_GUARD,XB(D)::QAB(E),XP(g)
- S(f);N_GUARD,N_SPINP(d)::QAB(E),XP(g)
- P(b);::QAR1(E),XP(d)
- Tries
- Try
- B(D);
- Vars
- S(f);N_GUARD::QAB(E),XP(g)
- S(f);N_GUARD,N_SPINP(d)::QAB(E),XP(g)
- Refutation
- P(e);
- Try
- B(D);CHECK
- Vars
- S(f);SBLOCK,XB(D)::QAB(E),XP(g)
- Refutation
- K(c);N_SPINP(d),S_FLIGHT,XB(D)
- Try
- B(D);
- Vars
- S(f);N_GUARD::QAB(E),XP(g)
- S(f);N_GUARD,N_SPINP(d)::QAB(E),XP(g)
- P(b);::QAR1(E),XP(d)
- Refutation
- P(e);
- Try
- Q(E);N_PINP(d)
- Threat
- B(D)
- Refutation
- P(d);
- Try
- Q(E);CHECK,N_PINP(d)
- Refutation
- P(d);P_SPINP(d)
- Try
- Q(E);CHECK,N_PINP(d)
- Vars
- S(f);N_GUARD,P_SPINS(f)::QAB1(E),XS(f)
- Refutation
- P(d);P_SPINP(d)
- Try
- Q(E);N_PINP(d)
- Vars
- S(f);N_GUARD,XB(D)::QAB(E)
- S(f);SBLOCK::B(D)
- S(f);N_GUARD::QAB(E)
- P(b);OGATEB::QAR2(E),XP(b)
- Refutation
- P(d);
- Try
- Q(E);N_PINP(d)
- Vars
- S(f);N_GUARD,XB(D)::QAB(E),XP(g)
- S(f);N_GUARD::QAB(E),XP(g)
- P(b);OGATEB::QAR2(E),XP(b)
- Refutation
- P(d);
- Try
- Actual
- Q(E);N_PINP(d),P_PINP(b)
- Vars
- S(f);N_GUARD,XB(D)::QAB(E)
- P(d);N_GUARD::QAR1(E),XP(b)
- S(f);SBLOCK::B(D)
- S(f);N_GUARD::QAB(E)
- P(b);OGATEB::QAR2(E),XP(b)
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).