PID: 214942 (5N2/B1rQKp2/n6N/4k3/2p2r2/3nP3/6B1/b2R4 w - - 0 1)
Anonymous
SEPA, 1942
#2
8 + 8
SOLUTION
SOUND
Sets
1...Rf1
2.Sg4#
1...Rf2
2.Sg4#
1...Rd4
2.Sxf7#
1...Re4
2.Sxf7#
1...Rg4
2.Sxg4#
2.Sxf7#
1...Rh4
2.Sxf7#
1...Rf5
2.Sg4#
1...Rf6
2.Sg4#
1...Rc5
2.Qd6#
1...Rc6
2.Qd5#
1...Rxd7+
2.Sxd7#
1...Rc8
2.Qd5#
2.Qd6#
1...Sc1
2.Rd5#
1...Se1
2.Rd5#
1...Sb2
2.Rd5#
1...Sf2
2.Rd5#
1...Sdc5
2.Rd5#
1...Sb4
2.Qxc7#
1...Sac5
2.Qxc7#
1...Sb8
2.Qxc7#
1...f5
2.Sf7#
2.Sg6#
1...f6
2.Sf7#
2.Sg6#
Tries
1.Bd4+?
1...Rxd4
2.Sxf7#
1...Bxd4!
1.Bc5?
threat
2.Bd6#
1...Rxd7+
2.Sxd7#
1...Rxc5
2.Qd6#
1...Sdxc5
2.Rd5#
1...Saxc5
2.Qxc7#
1...Rd4
2.Sxf7#
1...Re4
2.Sxf7#
1...Rf6
2.Sg4#
1...Rc6
2.Qd5#
1...Rf3!
1.exf4+?
1...Sxf4
2.Sg4#
2.Sxf7#
1...Kxf4!
Keys
1.Qxc7+!
1...Sxc7
2.Sd7#
FEATURES
Static
TYPE = CHECKING_KEY
CHANGED MATES = 0
ADDED MATES = 1
REMOVED MATES = 18
Sets
R(d);N_GUARD::S(D)
R(d);N_GUARD::S(D),XP(h)
R(g);N_PINQ(F)::QAB1(F)
R(g);N_PINQ(F)::QAR1(F)
R(g);CHECK,XQ(F)::S(H),XR(g)
S(b);OGATE::R1(A)
S(f);N_GUARD::QAB(F),XR(g)
Tries
Try
B(E);CHECK
Vars
R(d);XB(E)::S(D),XP(h)
Refutation
B(a);XB(E)
Try
B(E);
Threat
B(E)
Vars
R(g);CHECK,XQ(F)::S(H),XR(g)
R(g);N_PINQ(F),XB(E)::QAB1(F)
S(b);OGATE,XB(E)::R1(A)
S(f);N_GUARD,XB(E)::QAB(F),XR(g)
R(d);N_GUARD::S(D),XP(h)
R(d);N_GUARD::S(D)
R(g);N_PINQ(F)::QAR1(F)
Refutation
R(d);
Try
P(C);CHECK,XR(d)
Refutation
K(e);S_FLIGHT,XP(C)
Actual
Q(F);CHECK,N_SPINQ(F),XR(g)
Vars
S(f);XQ(F)::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).