PID: 66876 (1N6/2K5/8/kb1BR3/8/PPP5/8/8 w - - 0 1)
Orford, J
Chess, 1947
#2
7 + 2
SOLUTION
SOUND
Sets
1...Bf1
2.Bc4#
1...Be2
2.Bc4#
1...Bd3
2.Bc4#
1...Bc4
2.Bxc4#
1...Bc6
2.Bxc6#
1...Bd7
2.Bc6#
1...Be8
2.Bc6#
Tries
1.a4?
1...Bf1
2.Bc4#
1...Be2
2.Bc4#
1...Bd3
2.Bc4#
1...Bc4
2.Bxc4#
1...Ba6
2.Sc6#
1...Bc6
2.Bxc6#
1...Bd7
2.Bc6#
1...Be8
2.Bc6#
1...Bxa4!
Keys
1.c4!
1...Bxc4
2.Bxc4#
1...Ba4
2.b4#
1...Ba6
2.Sc6#
1...Bc6
2.Bxc6#
1...Bd7
2.Bc6#
1...Be8
2.Bc6#
FEATURES
Static
TYPE = INCOMPLETE_BLOCK
CHANGED MATES = 0
ADDED MATES = 2
REMOVED MATES = 3
Sets
B(b);OGATEB::R(E)+B(D)
B(b);OGATEB::R(E)+B(D),XB(b)
Tries
Try
P(A);
Vars
B(b);OGATEB::R(E)+B(D)
B(b);OGATEB::R(E)+B(D),XB(b)
B(b);N_GUARD,SBLOCK::S(G)
Refutation
B(b);XP(A)
Actual
P(C);
Vars
B(b);OGATE,XP(C)::R(E)+B(D),XB(b)
B(b);SBLOCK::P(B)
B(b);N_GUARD,SBLOCK::S(G)
B(b);OGATEB::R(E)+B(D),XB(b)
B(b);OGATEB::R(E)+B(D)
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).