PID: 72293 (2Q5/8/4p3/6P1/5p1N/1Rq4k/4rB1N/1nb3RK w - - 0 1)
Triggs, D
Chess, 1953
#2
8 + 7
SOLUTION
SOUND
Sets
1...Qe3
2.Qxe6#
1...Qf3+
2.Rxf3#
1...Ra2
2.Qxe6#
1...Rb2
2.Qxe6#
1...Rc2
2.Qxe6#
1...Rd2
2.Qxe6#
1...Be3
2.Qxe6#
Tries
1.Rxc3+?
1...Re3
2.Qxe6#
1...Be3
2.Qxe6#
1...f3
2.Rxf3#
1...Sxc3!
Keys
1.Sg6!
threat
2.Qh8#
1...Qf3+
2.Rxf3#
1...Re3
2.Sxf4#
1...Be3
2.Qxe6#
1...f3
2.Rg3#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 2
REMOVED MATES = 5
Sets
Q(d);S_CUTR(c)::QAB(H),XP(g)
Q(d);CHECK,OGATE::R(E),XQ(d)
R(c);N_GUARD::QAB(H),XP(g)
B(b);N_SPINQ(d),S_CUTR(c)::QAB(H),XP(g)
Tries
Try
R(E);CHECK,XQ(d)
Vars
R(c);P_SPINR(c)::QAB(H),XP(g)
B(b);P_SPINB(b)::QAB(H),XP(g)
P(f);N_SPINP(g),P_SPINP(f)::R(E),XP(f)
Refutation
S(a);XR(E)
Actual
S(F);
Threat
QAR(H)
Vars
Q(d);CHECK,OGATE::R(E),XQ(d)
R(c);N_SPINQ(d),S_CUTB(b)::S(F),XP(f)
B(b);N_SPINQ(d),S_CUTR(c)::QAB(H),XP(g)
P(f);N_GUARD,N_SPINQ(d),S_CUTQ(d)::R1(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).