PID: 11370 (bn6/4pB1Q/1b1B3n/5pp1/2P1k3/4P3/4K3/8 w - - 0 1)
Tweedy, A
Chess, 1938
#2
6 + 8
SOLUTION
SOUND
Sets
1...Bd5
2.Bxd5#
1...Sg4
2.Qh1#
1...Sxf7
2.Qh1#
1...Sg8
2.Qh1#
1...Sc6
2.Bd5#
Tries
1.Qxh6?
threat
2.Qh1#
2.Qe6#
1...exd6
2.Qe6#
1...f4
2.Bg6#
2.Qe6#
2.Qg6#
2.Qh7#
1...Bd4
2.Qh1#
1...Bd5
2.Bxd5#
2.Qh1#
1...Sc6
2.Bd5#
2.Qh1#
1...Sd7
2.Qh1#
1...e5
2.Qh1#
1...e6
2.Qh1#
2.Qxe6#
1...Bxe3!
Keys
1.Qh8!
threat
2.Qe5#
1...Sxf7
2.Qh1#
1...exd6
2.Qe8#
1...Bd4
2.Qxd4#
1...Sg4
2.Qh1#
1...Sc6
2.Bd5#
1...Sd7
2.Qxa8#
1...e5
2.Qxe5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 4
REMOVED MATES = 2
Sets
B(g);N_GUARD::B(E),XB(g)
S(e);OGATE::QAB(F)
S(e);OGATE,XB(E)::QAB(F)
S(h);S_CUTB(g)::B(E)
Tries
Try
Q(F);N_PINP(b),XS(e)
Threat
DUALS(2)
Vars
P(f);XB(D)::QAR2(F)
B(d);::QAB(F)
S(h);::QAB(F)
P(f);::QAB(F)
Refutation
B(d);XP(B)
Actual
Q(F);N_PINP(b)
Threat
QAR1(F)
Vars
S(e);OGATE,XB(E)::QAB(F)
P(f);OGATEB,XB(D)::QAR(F)
B(d);N_GUARD::QAR1(F),XB(d)
S(e);OGATE::QAB(F)
S(h);S_CUTB(g)::B(E)
S(h);OGATE::QAB(F),XB(g)
P(f);::QAR1(F),XP(f)
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).